Fixed doc build step

+ Prefix PathEvents

.editorconfig

@@ -13,3 +13,7 @@ quote_type = single
 [*.md]
 max_line_length = off
 trim_trailing_whitespace = false
+
+[*.{yaml,yml}]
+indent_style = space
+indent_size = 2

.github/workflows/build.yaml

@@ -11,26 +11,26 @@ jobs:
     runs-on: ubuntu-latest
     container: node:20-alpine
     steps:
-      -   name: Clone Repository
-          uses: ztimson/actions/clone@develop
+      - name: Clone Repository
+        uses: ztimson/actions/clone@develop
 
-      -   name: Install & Build
-          run: |
-            npm i
-            npm run build
+      - name: Install & Build
+        run: |
+          npm i
+          npm run build
 
-      -   name: Test
-          run: npm run test:coverage
+      - name: Test
+        run: npm run test:coverage
 
-      -   name: Upload to Registry
-          uses: ztimson/actions/npm/publish@develop
+      - name: Upload to Registry
+        uses: ztimson/actions/npm/publish@develop
 
-      -   name: Upload to NPM
-          uses: ztimson/actions/npm/publish@develop
-          with:
-              owner: ztimson
-              registry: https://registry.npmjs.org/
-              token: ${{secrets.NPM_TOKEN}}
+      - name: Upload to NPM
+        uses: ztimson/actions/npm/publish@develop
+        with:
+          owner: ztimson
+          registry: https://registry.npmjs.org/
+          token: ${{secrets.NPM_TOKEN}}
   tag:
     name: Tag Version
     needs: build
@@ -38,23 +38,53 @@ jobs:
     runs-on: ubuntu-latest
     container: node
     steps:
-      -   name: Clone Repository
-          uses: ztimson/actions/clone@develop
-
-      -   name: Get Version Number
-          run: echo "VERSION=$(cat package.json | grep version | grep -Eo ':.+' | grep -Eo '[[:alnum:]\.\/\-]+')" >> $GITHUB_ENV
-
-      -   name: Tag Version
-          uses: ztimson/actions/tag@develop
-          with:
-            tag: ${{env.VERSION}}
+      - name: Clone Repository
+        uses: ztimson/actions/clone@develop
 
+      - name: Get Version Number
+        run: echo "VERSION=$(cat package.json | grep version | grep -Eo ':.+' | grep -Eo '[[:alnum:]\.\/\-]+')" >> $GITHUB_ENV
 
+      - name: Tag Version
+        uses: ztimson/actions/tag@develop
+        with:
+          tag: ${{env.VERSION}}
   docs:
-    name: Publish Documentation
-    needs: build
-    uses: ztimson/actions/.github/workflows/docker.yaml@develop
-    with:
-        name: ztimson/utils
-        repository: ${{github.server_url}}/${{github.repository}}.git
-        pass: ${{secrets.DEPLOY_TOKEN}}
+    name: Publish Docs
+    runs-on: ubuntu-latest
+    container: docker:dind
+    steps:
+      - name: Clone Repository
+        uses: ztimson/actions/clone@develop
+
+      - name: Build Image
+        run: |
+          REGISTRY=$(echo ${{github.server_url}} | sed s%http://%% | sed s%https://%%)
+          docker build -t "$REGISTRY/${{github.repository}}:${{github.ref_name}}" .
+
+      - name: Build Image
+        run: |
+          echo "CHECKSUM: ${{env.CHECKSUM}}"
+          REGISTRY=$(echo ${{github.server_url}} | sed s%http://%% | sed s%https://%%)
+          docker build -t "$REGISTRY/${{github.repository}}:${{github.ref_name}}" --build-arg LICENSE_KEY="${{secrets.LICENSE_KEY}}" --build-arg UPDATE_TOKEN="${{secrets.UPDATE_TOKEN}}" .
+
+      - name: Publish Branch Tag
+        run: |
+          REGISTRY=$(echo ${{github.server_url}} | sed s%http://%% | sed s%https://%%)
+          docker login -u ${{github.repository_owner}} -p ${{secrets.DEPLOY_TOKEN}} $REGISTRY
+          docker push "$REGISTRY/${{github.repository}}:${{github.ref_name}}"
+
+      - name: Publish Version Tag
+        run: |
+          if [ "${{github.ref_name}}" = "master" ]; then
+            REGISTRY=$(echo ${{github.server_url}} | sed s%http://%% | sed s%https://%%)
+            docker tag "$REGISTRY/${{github.repository}}:${{github.ref_name}}" "$REGISTRY/${{github.repository}}:${{env.VERSION}}"
+            docker push "$REGISTRY/${{github.repository}}:${{env.VERSION}}"
+          fi
+
+      - name: Publish Latest Tag
+        run: |
+          if [ "${{github.ref_name}}" = "master" ]; then
+            REGISTRY=$(echo ${{github.server_url}} | sed s%http://%% | sed s%https://%%)
+            docker tag "$REGISTRY/${{github.repository}}:${{github.ref_name}}" "$REGISTRY/${{github.repository}}:latest"
+            docker push "$REGISTRY/${{github.repository}}:latest"
+          fi

.gitmodules

@@ -1,5 +1,5 @@
 [submodule "docs"]
 	path = docs
-	url = git@git.zakscode.com:ztimson/utils.wiki.git
+	url = ../utils.wiki.git
 	branch = master
 	ignore = all

index.html

@@ -1,15 +1,102 @@
-<!Doctype html>
-
+<!DOCTYPE html>
 <html>
 	<head>
-		<title>@ztimson/utils sandbox</title>
+		<title>Console Styling Playground</title>
 	</head>
 	<body>
-		<script type="module">
-			import {PathEvent} from './dist/index.mjs';
+		<h1>Open Chrome DevTools Console to see magic! (Ctrl+Shift+J or Cmd+Option+J)</h1>
 
-			console.log(PathEvent.filter(['payments/ztimson:cr', 'logs/momentum:c', 'data/Testing:r'], 'data'));
-			console.log(PathEvent.filter(['data/Submissions/Test:r'], 'data/Submissions/Test/test.html'));
+		<script>
+			// Console Styling Playground
+			class ConsoleStyler {
+				// Basic badge with customizable colors
+				badge(text, bgColor = '#007bff', textColor = 'white') {
+					console.log(
+						`%c ${text} `,
+						`background-color: ${bgColor};
+                 color: ${textColor};
+                 border-radius: 12px;
+                 padding: 2px 8px;
+                 font-weight: bold;`
+					);
+				}
+
+				// Multi-style log with different sections
+				richLog() {
+					console.log(
+						'%cSystem%c Operation %cDetails',
+						'background-color: #f0f0f0; color: black; padding: 2px 5px; border-radius: 3px;',
+						'color: blue; font-weight: bold;',
+						'color: green;'
+					);
+				}
+
+				// Grouped logs with nested information
+				groupedLog(title, items) {
+					console.group(title);
+					items.forEach(item => {
+						console.log(item);
+					});
+					console.groupEnd();
+				}
+
+				// Table view for structured data
+				tableLog(data) {
+					console.table(data);
+				}
+
+				// Performance tracking
+				timeTrack(label, operation) {
+					console.time(label);
+					operation();
+					console.timeEnd(label);
+				}
+
+				// Demonstration method
+				demo() {
+					// Different styled badges
+					this.badge('NEW', '#28a745');  // Green
+					this.badge('WARNING', '#ffc107', 'black');  // Yellow
+					this.badge('ERROR', '#dc3545');  // Red
+					this.badge('CUSTOM', '#6f42c1');  // Purple
+
+					// Rich multi-style log
+					this.richLog();
+
+					// Grouped logs
+					this.groupedLog('User Details', [
+						{ name: 'John Doe', age: 30, role: 'Admin' },
+						{ name: 'Jane Smith', age: 25, role: 'User' }
+					]);
+
+					// Table logging
+					this.tableLog([
+						{ name: 'John', age: 30, active: true },
+						{ name: 'Jane', age: 25, active: false }
+					]);
+
+					// Performance tracking
+					this.timeTrack('Complex Operation', () => {
+						let sum = 0;
+						for(let i = 0; i < 1000000; i++) {
+							sum += i;
+						}
+						console.log('Sum:', sum);
+					});
+
+					// Advanced: Conditional styling
+					const logLevel = 'warn';
+					console.log(
+						`%c[${logLevel.toUpperCase()}]%c Detailed message`,
+						`color: ${logLevel === 'warn' ? 'orange' : 'red'}; font-weight: bold;`,
+						'color: black;'
+					);
+				}
+			}
+
+			// Create instance and run demo
+			const styler = new ConsoleStyler();
+			styler.demo();
 		</script>
 	</body>
 </html>

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@ztimson/utils",
-	"version": "0.23.14",
+	"version": "0.27.9",
 	"description": "Utility library",
 	"author": "Zak Timson",
 	"license": "MIT",
@@ -14,9 +14,9 @@
 	"types": "./dist/index.d.ts",
 	"exports": {
 		".": {
+			"types": "./dist/index.d.ts",
 			"import": "./dist/index.mjs",
-			"require": "./dist/index.cjs",
-			"types": "./dist/index.d.ts"
+			"require": "./dist/index.cjs"
 		}
 	},
 	"scripts": {
@@ -26,15 +26,19 @@
 		"test:coverage": "npx jest --coverage",
 		"watch": "npx vite build --watch"
 	},
+	"dependencies": {
+		"var-persist": "^1.0.1"
+	},
 	"devDependencies": {
 		"@types/jest": "^29.5.12",
+		"fake-indexeddb": "^6.0.1",
 		"jest": "^29.7.0",
 		"jest-junit": "^16.0.0",
 		"ts-jest": "^29.1.2",
 		"typedoc": "^0.26.7",
 		"typescript": "^5.3.3",
 		"vite": "^5.0.12",
-		"vite-plugin-dts": "^3.7.2"
+		"vite-plugin-dts": "^4.5.3"
 	},
 	"files": [
 		"dist"

src/arg-parser.ts

@@ -72,10 +72,11 @@ export class ArgParser {
 					extras.push(arg);
 					continue;
 				}
-				const value = argDef.default === false ? true :
-							  argDef.default === true ? false :
-							  queue.splice(queue.findIndex(q => q[0] != '-'), 1)[0] ||
-							  argDef.default;
+				const value = combined[1] != null ? combined [1] :
+					argDef.default === false ? true :
+					argDef.default === true ? false :
+					queue.splice(queue.findIndex(q => q[0] != '-'), 1)[0] ||
+					argDef.default;
 				if(value == null) parsed['_error'].push(`Option missing value: ${argDef.name || combined[0]}`);
 				parsed[argDef.name] = value;
 			} else { // Command

src/array.ts

@@ -1,3 +1,4 @@
+import {ASet} from './aset.ts';
 import {dotNotation, isEqual} from './objects';
 
 /**
@@ -28,10 +29,7 @@ export function addUnique<T>(array: T[], el: T): T[] {
  * @deprecated Use ASet to perform Set operations on arrays
  */
 export function arrayDiff(a: any[], b: any[]): any[] {
-	return makeUnique([
-		...a.filter(v1 => !b.includes((v2: any) => isEqual(v1, v2))),
-		...b.filter(v1 => !a.includes((v2: any) => isEqual(v1, v2))),
-	]);
+	return new ASet(a).symmetricDifference(new ASet(b));
 }
 
 /**

src/aset.ts

@@ -29,6 +29,14 @@ export class ASet<T> extends Array {
 		return this;
 	}
 
+	/**
+	 * Remove all elements
+	 */
+	clear() {
+		this.splice(0, this.length);
+		return this;
+	}
+
 	/**
 	 * Delete elements from set
 	 * @param items Elements that will be deleted

src/cache.ts

@@ -1,45 +1,75 @@
-import {deepCopy} from './objects.ts';
+import {Database, Table} from './database.ts';
+import {JSONSanitize} from './json.ts';
+import {deepCopy, includes} from './objects.ts';
 
 export type CacheOptions = {
 	/** Delete keys automatically after x amount of seconds */
 	ttl?: number;
 	/** Storage to persist cache */
-	storage?: Storage;
-	/** Key cache will be stored under */
-	storageKey?: string;
+	persistentStorage?: {storage: Storage | Database, key: string} | string;
+	/** Keep or delete cached items once expired, defaults to delete */
+	expiryPolicy?: 'delete' | 'keep';
+	/** Least Recently Used size limit */
+	sizeLimit?: number;
 }
 
+export type CachedValue<T> = T & {_expired?: boolean};
+
 /**
  * Map of data which tracks whether it is a complete collection & offers optional expiry of cached values
  */
 export class Cache<K extends string | number | symbol, T> {
-	private store = <Record<K, T>>{};
+	private _loading!: Function;
+	private store: Map<K, T> = new Map();
+	private timers: Map<K, NodeJS.Timeout> = new Map();
+	private lruOrder: K[] = [];
 
 	/** Support index lookups */
-	[key: string | number | symbol]: T | any;
+	[key: string | number | symbol]: CachedValue<T> | any;
 	/** Whether cache is complete */
 	complete = false;
+	/** Await initial loading */
+	loading = new Promise<void>(r => this._loading = r);
 
 	/**
 	 * Create new cache
-	 *
 	 * @param {keyof T} key Default property to use as primary key
 	 * @param options
 	 */
 	constructor(public readonly key?: keyof T, public readonly options: CacheOptions = {}) {
-		if(options.storageKey && !options.storage && typeof(Storage) !== 'undefined')
-			options.storage = localStorage;
-		if(options.storageKey && options.storage) {
-			const stored = options.storage.getItem(options.storageKey);
-			if(stored) {
-				try { Object.assign(this.store, JSON.parse(stored)); }
-				catch { }
+		// Persistent storage
+		if(this.options.persistentStorage != null) {
+			if(typeof this.options.persistentStorage == 'string')
+				this.options.persistentStorage = {storage: localStorage, key: this.options.persistentStorage};
+
+			if(this.options.persistentStorage?.storage?.database != undefined) {
+				(async () => {
+					const persists: any = this.options.persistentStorage;
+					const table: Table<any, any> = await persists.storage.createTable({name: persists.key, key: this.key});
+					const rows = await table.getAll();
+					for(const row of rows) this.store.set(this.getKey(row), row);
+					this._loading();
+				})();
+			} else if((<any>this.options.persistentStorage?.storage)?.getItem != undefined) {
+				const {storage, key} = <{storage: Storage, key: string}>this.options.persistentStorage;
+				const stored = storage.getItem(key);
+				if(stored != null) {
+					try {
+						const obj = JSON.parse(stored);
+						for(const k of Object.keys(obj)) this.store.set(<any>k, obj[k]);
+					} catch { /* ignore */ }
+				}
+				this._loading();
 			}
+		} else {
+			this._loading();
 		}
+
+		// Handle index lookups
 		return new Proxy(this, {
 			get: (target: this, prop: string | symbol) => {
 				if(prop in target) return (target as any)[prop];
-				return deepCopy(target.store[prop as K]);
+				return this.get(prop as K, true);
 			},
 			set: (target: this, prop: string | symbol, value: any) => {
 				if(prop in target) (target as any)[prop] = value;
@@ -51,21 +81,63 @@ export class Cache<K extends string | number | symbol, T> {
 
 	private getKey(value: T): K {
 		if(!this.key) throw new Error('No key defined');
-		return <K>value[this.key];
+		if((value as any)[this.key] === undefined) throw new Error(`${this.key.toString()} Doesn't exist on ${JSON.stringify(value, null, 2)}`);
+		return <K>(value as any)[this.key];
+	}
+
+	private save(key?: K) {
+		const persists: {storage: any, key: string} = <any>this.options.persistentStorage;
+		if(!!persists?.storage) {
+			if(persists.storage?.database != undefined) {
+				(<Database>persists.storage).createTable({name: persists.key, key: <string>this.key}).then(table => {
+					if(key !== undefined) {
+						const value = this.get(key, true);
+						if(value != null) table.set(value, key);
+						else table.delete(key);
+					} else {
+						table.clear();
+						this.all(true).forEach(row => table.add(row));
+					}
+				});
+			} else if(persists.storage?.setItem != undefined) {
+				const obj: Record<any, any> = {};
+				for(const [k, v] of this.store.entries()) obj[k as any] = v;
+				persists.storage.setItem(persists.key, JSONSanitize(obj));
+			}
+		}
+	}
+
+	private clearTimer(key: K) {
+		const t = this.timers.get(key);
+		if(t) { clearTimeout(t); this.timers.delete(key); }
+	}
+
+	private touchLRU(key: K) {
+		if(!this.options.sizeLimit || this.options.sizeLimit <= 0) return;
+		const idx = this.lruOrder.indexOf(key);
+		if(idx >= 0) this.lruOrder.splice(idx, 1);
+		this.lruOrder.push(key);
+		while(this.lruOrder.length > (this.options.sizeLimit || 0)) {
+			const lru = this.lruOrder.shift();
+			if(lru !== undefined) this.delete(lru);
+		}
 	}
 
 	/**
 	 * Get all cached items
-	 *
 	 * @return {T[]} Array of items
 	 */
-	all(): T[] {
-		return deepCopy(Object.values(this.store));
+	all(expired?: boolean): CachedValue<T>[] {
+		const out: CachedValue<T>[] = [];
+		for(const v of this.store.values()) {
+			const val: any = v;
+			if(expired || !val?._expired) out.push(deepCopy<any>(val));
+		}
+		return out;
 	}
 
 	/**
 	 * Add a new item to the cache. Like set, but finds key automatically
-	 *
 	 * @param {T} value Item to add to cache
 	 * @param {number | undefined} ttl Override default expiry
 	 * @return {this}
@@ -78,12 +150,12 @@ export class Cache<K extends string | number | symbol, T> {
 
 	/**
 	 * Add several rows to the cache
-	 *
 	 * @param {T[]} rows Several items that will be cached using the default key
 	 * @param complete Mark cache as complete & reliable, defaults to true
 	 * @return {this}
 	 */
 	addAll(rows: T[], complete = true): this {
+		this.clear();
 		rows.forEach(r => this.add(r));
 		this.complete = complete;
 		return this;
@@ -92,79 +164,140 @@ export class Cache<K extends string | number | symbol, T> {
 	/**
 	 * Remove all keys from cache
 	 */
-	clear() {
-		this.store = <Record<K, T>>{};
+	clear(): this {
+		this.complete = false;
+		for (const [k, t] of this.timers) clearTimeout(t);
+		this.timers.clear();
+		this.lruOrder = [];
+		this.store.clear();
+		this.save();
+		return this;
 	}
 
 	/**
 	 * Delete an item from the cache
-	 *
 	 * @param {K} key Item's primary key
 	 */
-	delete(key: K) {
-		delete this.store[key];
-		if(this.options.storageKey && this.options.storage)
-			this.options.storage.setItem(this.options.storageKey, JSON.stringify(this.store));
+	delete(key: K): this {
+		this.clearTimer(key);
+		const idx = this.lruOrder.indexOf(key);
+		if(idx >= 0) this.lruOrder.splice(idx, 1);
+		this.store.delete(key);
+		this.save(key);
+		return this;
 	}
 
 	/**
 	 * Return cache as an array of key-value pairs
 	 * @return {[K, T][]} Key-value pairs array
 	 */
-	entries(): [K, T][] {
-		return <[K, T][]>Object.entries(this.store);
+	entries(expired?: boolean): [K, CachedValue<T>][] {
+		const out: [K, CachedValue<T>][] = [];
+		for(const [k, v] of this.store.entries()) {
+			const val: any = v;
+			if(expired || !val?._expired) out.push([k, deepCopy<any>(val)]);
+		}
+		return out;
+	}
+
+	/**
+	 * Manually expire a cached item
+	 * @param {K} key Key to expire
+	 */
+	expire(key: K): this {
+		this.complete = false;
+		if(this.options.expiryPolicy == 'keep') {
+			const v: any = this.store.get(key);
+			if(v) {
+				v._expired = true;
+				this.store.set(key, v);
+				this.save(key);
+			}
+		} else this.delete(key);
+		return this;
+	}
+
+	/**
+	 * Find the first cached item to match a filter
+	 * @param {Partial<T>} filter Partial item to match
+	 * @param {Boolean} expired Include expired items, defaults to false
+	 * @returns {T | undefined} Cached item or undefined if nothing matched
+	 */
+	find(filter: Partial<T>, expired?: boolean): T | undefined {
+		for(const v of this.store.values()) {
+			const row: any = v;
+			if((expired || !row._expired) && includes(row, filter)) return deepCopy<any>(row);
+		}
+		return undefined;
 	}
 
 	/**
 	 * Get item from the cache
 	 * @param {K} key Key to lookup
+	 * @param expired Include expired items
 	 * @return {T} Cached item
 	 */
-	get(key: K): T {
-		return deepCopy(this.store[key]);
+	get(key: K, expired?: boolean): CachedValue<T> | null {
+		const raw = this.store.get(key);
+		if(raw == null) return null;
+		const cached: any = deepCopy<any>(raw);
+		this.touchLRU(key);
+		if(expired || !cached?._expired) return cached;
+		return null;
 	}
 
 	/**
 	 * Get a list of cached keys
-	 *
 	 * @return {K[]} Array of keys
 	 */
-	keys(): K[] {
-		return <K[]>Object.keys(this.store);
+	keys(expired?: boolean): K[] {
+		const out: K[] = [];
+		for(const [k, v] of this.store.entries()) {
+			const val: any = v;
+			if(expired || !val?._expired) out.push(k);
+		}
+		return out;
 	}
 
 	/**
 	 * Get map of cached items
-	 *
 	 * @return {Record<K, T>}
 	 */
-	map(): Record<K, T> {
-		return deepCopy(this.store);
+	map(expired?: boolean): Record<K, CachedValue<T>> {
+		const copy: any = {};
+		for(const [k, v] of this.store.entries()) {
+			const val: any = v;
+			if(expired || !val?._expired) copy[k as any] = deepCopy<any>(val);
+		}
+		return copy;
 	}
 
 	/**
 	 * Add an item to the cache manually specifying the key
-	 *
 	 * @param {K} key Key item will be cached under
 	 * @param {T} value Item to cache
 	 * @param {number | undefined} ttl Override default expiry in seconds
 	 * @return {this}
 	 */
 	set(key: K, value: T, ttl = this.options.ttl): this {
-		this.store[key] = value;
-		if(this.options.storageKey && this.options.storage)
-			this.options.storage.setItem(this.options.storageKey, JSON.stringify(this.store));
-		if(ttl) setTimeout(() => {
-			this.complete = false;
-			this.delete(key);
-		}, ttl * 1000);
+		if(this.options.expiryPolicy == 'keep') delete (<any>value)._expired;
+		this.clearTimer(key);
+		this.store.set(key, value);
+		this.touchLRU(key);
+		this.save(key);
+		if(ttl) {
+			const t = setTimeout(() => {
+				this.expire(key);
+				this.save(key);
+			}, (ttl || 0) * 1000);
+			this.timers.set(key, t);
+		}
 		return this;
 	}
 
 	/**
 	 * Get all cached items
-	 *
 	 * @return {T[]} Array of items
 	 */
-	values = this.all();
+	values = this.all
 }

src/color.ts

@@ -3,10 +3,10 @@
  * @param {string} background Color to compare against
  * @return {"white" | "black"} Color with the most contrast
  */
-export function blackOrWhite(background: string): 'white' | 'black' {
-	const exploded = background?.match(background.length >= 6 ? /\w\w/g : /\w/g);
-	if(!exploded) return 'black';
-	const [r, g, b] = exploded.map(hex => parseInt(hex, 16));
+export function contrast(background: string): 'white' | 'black' {
+	const exploded = background?.match(background.length >= 6 ? /[0-9a-fA-F]{2}/g : /[0-9a-fA-F]/g);
+	if(!exploded || exploded?.length < 3) return 'black';
+	const [r, g, b] = exploded.map(hex => parseInt(hex.length == 1 ? `${hex}${hex}` : hex, 16));
 	const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
 	return luminance > 0.5 ? 'black' : 'white';
 }

src/csv.ts

@@ -1,32 +1,60 @@
+import {makeArray} from './array.ts';
 import {ASet} from './aset.ts';
-import {dotNotation, flattenObj, JSONSanitize} from './objects.ts';
+import {JSONSanitize} from './json.ts';
+import {dotNotation, flattenObj} from './objects.ts';
 import {LETTER_LIST} from './string.ts';
 
-export function fromCsv<T = any>(csv: string, hasHeaders=true): T[] {
-	const row = csv.split('\n');
-	let headers: any = hasHeaders ? row.splice(0, 1)[0] : null;
-	if(headers) headers = headers.match(/(?:[^,"']+|"[^"]*"|'[^']*')+/g);
-	return <T[]>row.map(r => {
-		function parseLine(line: string): (string | null)[] {
-			const parts = line.split(','), columns: string[] = [];
-			let quoted = false;
-			for(const p of parts) {
-				if(quoted) columns[columns.length - 1] = columns.at(-1) + ',' + p;
-				else columns.push(p);
-				if(/[^"]"$/g.test(p)) {
-					quoted = false;
-				} else if(/^"[^"]/g.test(p)) {
-					quoted = true;
-				}
-			}
-			return columns;
+/**
+ * Parse a CSV string into an array of objects
+ *
+ * @param csv String with CSV
+ * @param hasHeaders First line of CSV contains headers
+ * @return {T[]} Array of parsed objects
+ */
+export function fromCsv<T = any>(csv: string, hasHeaders = true): T[] {
+	function parseLine(line: string): (string | null)[] {
+		const columns: string[] = [];
+		let current = '', inQuotes = false;
+		for (let i = 0; i < line.length; i++) {
+			const char = line[i];
+			const nextChar = line[i + 1];
+			if (char === '"') {
+				if (inQuotes && nextChar === '"') {
+					current += '"'; // Handle escaped quotes
+					i++;
+				} else inQuotes = !inQuotes;
+			} else if (char === ',' && !inQuotes) {
+				columns.push(current.trim()); // Trim column values
+				current = '';
+			} else current += char;
 		}
+		columns.push(current.trim()); // Trim last column value
+		return columns.map(col => col.replace(/^"|"$/g, '').replace(/""/g, '"'));
+	}
 
+	// Normalize line endings and split rows
+	const rows = [];
+	let currentRow = '', inQuotes = false;
+	for (const char of csv.replace(/\r\n/g, '\n')) { // Normalize \r\n to \n
+		if (char === '"') inQuotes = !inQuotes;
+		if (char === '\n' && !inQuotes) {
+			rows.push(currentRow.trim()); // Trim row
+			currentRow = '';
+		} else currentRow += char;
+	}
+	if (currentRow) rows.push(currentRow.trim()); // Trim last row
+
+	// Extract headers
+	let headers: any = hasHeaders ? rows.splice(0, 1)[0] : null;
+	if (headers) headers = headers.match(/(?:[^,"']+|"(?:[^"]|"")*"|'(?:[^']|'')*')+/g)?.map((h: any) => h.trim());
+
+	// Parse rows
+	return <T[]>rows.map(r => {
 		const props = parseLine(r);
-		const h = headers || (Array(props.length).fill(null).map((r, i) => {
+		const h = headers || (Array(props.length).fill(null).map((_, i) => {
 			let letter = '';
 			const first = i / 26;
-			if(first > 1) letter += LETTER_LIST[Math.floor(first - 1)];
+			if (first > 1) letter += LETTER_LIST[Math.floor(first - 1)];
 			letter += LETTER_LIST[i % 26];
 			return letter;
 		}));
@@ -34,23 +62,28 @@ export function fromCsv<T = any>(csv: string, hasHeaders=true): T[] {
 			dotNotation(acc, h, props[i]);
 			return acc;
 		}, {});
-	})
+	});
 }
 
+
 /**
- * Convert an object to a CSV string
+ * Convert an array of objects to a CSV string
  *
  * @param {any[]} target Array of objects to create CSV from
  * @param {boolean} flatten Should nested object be flattened or treated as values
  * @return {string} CSV string
  */
-export function toCsv(target: any[], flatten=true) {
-	const headers = new ASet(target.reduce((acc, row) => [...acc, ...Object.keys(flatten ? flattenObj(row) : row)], []));
+export function toCsv(target: any, flatten=true) {
+	const t = makeArray(target);
+	const headers = new ASet(t.reduce((acc, row) => [...acc, ...Object.keys(flatten ? flattenObj(row) : row)], []));
 	return [
 		headers.join(','),
-		...target.map(row => headers.map((h: string) => {
+		...t.map(row => headers.map((h: string) => {
 			const value = dotNotation<any>(row, h);
-			return (typeof value == 'object' && value != null) ? '"' + JSONSanitize(value).replaceAll('"', '""') + '"' : value;
+			if(value == null) return '';
+			if(typeof value == 'object') return `"${JSONSanitize(value).replaceAll('"', '""')}"`;
+			if(typeof value == 'string' &&  /[\n",]/g.test(value)) return `"${value.replaceAll('"', '""')}"`;
+			return value;
 		}).join(','))
 	].join('\n');
 }

src/database.ts

@@ -0,0 +1,204 @@
+import {findByProp} from './array.ts';
+import {ASet} from './aset.ts';
+import {sleepWhile} from './time.ts';
+
+export type TableOptions = {
+	name: string;
+	key?: string;
+	autoIncrement?: boolean;
+};
+
+class AsyncLock {
+	private p = Promise.resolve();
+	run<T>(fn: () => Promise<T>): Promise<T> {
+		const res = this.p.then(fn, fn);
+		this.p = res.then(() => {}, () => {});
+		return res;
+	}
+}
+
+export class Database {
+	private schemaLock = new AsyncLock();
+	private upgrading = false;
+
+	connection!: Promise<IDBDatabase>;
+	tables!: TableOptions[];
+
+	get ready() { return !this.upgrading; }
+
+	constructor(public readonly database: string, tables?: (string | TableOptions)[], public version?: number) {
+		this.connection = new Promise((resolve, reject) => {
+			let req: IDBOpenDBRequest;
+			try { req = indexedDB.open(this.database, this.version); }
+			catch (err) { return reject(err); }
+
+			this.tables = !tables ? [] : tables.map(t => {
+				t = typeof t == 'object' ? t : {name: t};
+				return {...t, name: t.name.toString()};
+			});
+
+			req.onerror = () => reject(req.error);
+
+			req.onsuccess = () => {
+				let db: IDBDatabase;
+				try { db = req.result; }
+				catch (err) { return reject(err); }
+
+				const existing = Array.from(db.objectStoreNames);
+				if(!tables) {
+					this.tables = existing.map(t => {
+						try {
+							const tx = db.transaction(t, 'readonly');
+							const store = tx.objectStore(t);
+							return {name: t, key: <string>store.keyPath};
+						} catch {
+							return {name: t}; // 🛡️ fallback
+						}
+					});
+				}
+				const desired = new ASet((tables || []).map(t => typeof t == 'string' ? t : t.name));
+				if(tables && desired.symmetricDifference(new ASet(existing)).length) {
+					db.close();
+					Object.assign(this, new Database(this.database, this.tables, db.version + 1));
+					this.connection.then(resolve);
+				} else {
+					this.version = db.version;
+					resolve(db);
+				}
+				this.upgrading = false;
+			};
+
+			req.onupgradeneeded = () => {
+				this.upgrading = true;
+				let db: IDBDatabase;
+				try { db = req.result; }
+				catch { return; }
+				try {
+					const existingTables = new ASet(Array.from(db.objectStoreNames));
+					if(tables) {
+						const desired = new ASet((tables || []).map(t => typeof t == 'string' ? t : t.name));
+						existingTables.difference(desired).forEach(name => db.deleteObjectStore(name));
+						desired.difference(existingTables).forEach(name => {
+							const t = this.tables.find(findByProp('name', name));
+							db.createObjectStore(name, {
+								keyPath: t?.key,
+								autoIncrement: t?.autoIncrement || !t?.key,
+							});
+						});
+					}
+				} catch { }
+			};
+		});
+	}
+
+	waitForUpgrade = () => sleepWhile(() => this.upgrading);
+
+	async createTable<K extends IDBValidKey = any, T = any>(table: string | TableOptions): Promise<Table<K, T>> {
+		return this.schemaLock.run(async () => {
+			if(typeof table == 'string') table = { name: table };
+			const conn = await this.connection;
+			if(!this.includes(table.name)) {
+				const newDb = new Database(this.database, [...this.tables, table], (this.version ?? 0) + 1);
+				conn.close();
+				this.connection = newDb.connection;
+				await this.connection;
+				Object.assign(this, newDb);
+			}
+			return this.table<K, T>(table.name);
+		});
+	}
+
+	async deleteTable(table: string | TableOptions): Promise<void> {
+		return this.schemaLock.run(async () => {
+			if(typeof table == 'string') table = { name: table };
+			if(!this.includes(table.name)) return;
+			const conn = await this.connection;
+			const newDb = new Database(this.database, this.tables.filter(t => t.name != (<TableOptions>table).name), (this.version ?? 0) + 1);
+			conn.close();
+			this.connection = newDb.connection;
+			await this.connection;
+			Object.assign(this, newDb);
+		});
+	}
+
+	includes(name: any): boolean {
+		return !!this.tables.find(t => t.name == (typeof name == 'object' ? name.name : name.toString()));
+	}
+
+	table<K extends IDBValidKey = any, T = any>(name: any): Table<K, T> {
+		return new Table<K, T>(this, name.toString());
+	}
+}
+
+export class Table<K extends IDBValidKey = any, T = any> {
+	constructor(private readonly database: Database, public readonly name: string, public readonly key: keyof T | string = 'id') {
+		this.database.connection.then(() => {
+			const exists = !!this.database.tables.find(findByProp('name', this.name));
+			if(!exists) this.database.createTable(this.name);
+		});
+	}
+
+	async tx<R>(table: string, fn: (store: IDBObjectStore) => IDBRequest, readonly = false): Promise<R> {
+		await this.database.waitForUpgrade();
+		const db = await this.database.connection;
+		const tx = db.transaction(table, readonly ? 'readonly' : 'readwrite');
+		return new Promise<R>((resolve, reject) => {
+			const request = fn(tx.objectStore(table));
+			request.onsuccess = () => resolve(request.result as R);
+			request.onerror = () => reject(request.error);
+		});
+	}
+
+	add(value: T, key?: K): Promise<void> {
+		return this.tx(this.name, store => store.add(value, key));
+	}
+
+	all = this.getAll;
+
+	clear(): Promise<void> {
+		return this.tx(this.name, store => store.clear());
+	}
+
+	count(): Promise<number> {
+		return this.tx(this.name, store => store.count(), true);
+	}
+
+	create = this.add;
+
+	delete(key: K): Promise<void> {
+		return this.tx(this.name, store => store.delete(key));
+	}
+
+	get(key: K): Promise<T> {
+		return this.tx(this.name, store => store.get(key), true);
+	}
+
+	getAll(): Promise<T[]> {
+		return this.tx(this.name, store => store.getAll(), true);
+	}
+
+	getAllKeys(): Promise<K[]> {
+		return this.tx(this.name, store => store.getAllKeys(), true);
+	}
+
+	put(value: T, key?: string): Promise<void> {
+		return this.tx(this.name, store => {
+			if(store.keyPath) return store.put(value);
+			return store.put(value, key);
+		});
+	}
+
+	read(): Promise<T[]>;
+	read(key: K): Promise<T>;
+	read(key?: K): Promise<T | T[]> {
+		return key ? this.get(key) : this.getAll();
+	}
+
+	set(value: T, key?: K): Promise<void> {
+		if(key) (<any>value)[this.key] = key;
+		if(!(<any>value)[this.key]) return this.add(value);
+		return this.put(value);
+	}
+
+	update = this.set;
+}

src/emitter.ts

@@ -17,7 +17,7 @@ export class TypedEmitter<T extends TypedEvents = TypedEvents> {
 
 	static off(event: any, listener: TypedListener) {
 		const e = event.toString();
-		this.listeners[e] = (this.listeners[e] || []).filter(l => l === listener);
+		this.listeners[e] = (this.listeners[e] || []).filter(l => l != listener);
 	}
 
 	static on(event: any, listener: TypedListener) {
@@ -43,7 +43,7 @@ export class TypedEmitter<T extends TypedEvents = TypedEvents> {
 	};
 
 	off<K extends keyof T = string>(event: K, listener: T[K]) {
-		this.listeners[event] = (this.listeners[event] || []).filter(l => l === listener);
+		this.listeners[event] = (this.listeners[event] || []).filter(l => l != listener);
 	}
 
 	on<K extends keyof T = string>(event: K, listener: T[K]) {

src/files.ts

@@ -1,5 +1,5 @@
 import {makeArray} from './array.ts';
-import {JSONAttemptParse} from './objects.ts';
+import {JSONAttemptParse} from './json.ts';
 import {PromiseProgress} from './promise-progress';
 import {formatDate} from './time.ts';
 
@@ -77,7 +77,7 @@ export function fileText(file: any): Promise<string | null> {
  */
 export function timestampFilename(name?: string, date: Date | number | string = new Date()) {
 	if(typeof date == 'number' || typeof date == 'string') date = new Date(date);
-	const timestamp = formatDate('YYYY-MM-DD_HH:mm:ss', date);
+	const timestamp = formatDate('YYYY-MM-DD_HH-mm', date);
 	return name ? name.replace('{{TIMESTAMP}}', timestamp) : timestamp;
 }
 

src/http.ts

@@ -30,7 +30,13 @@ class HttpResponse<T = any> extends Response {
 	url!: string;
 
 	constructor(resp: Response, stream: ReadableStream) {
-		super(stream, {headers: resp.headers, status: resp.status, statusText: resp.statusText});
+		const body = [204, 205, 304].includes(resp.status) ? null : stream;
+		super(body, {
+			headers: resp.headers,
+			status: resp.status,
+			statusText: resp.statusText,
+		});
+
 		this.ok = resp.ok;
 		this.redirected = resp.redirected;
 		this.type = resp.type;
@@ -70,8 +76,9 @@ export class Http {
 
 	request<T>(opts: HttpRequestOptions = {}): PromiseProgress<DecodedResponse<T>>  {
 		if(!this.url && !opts.url) throw new Error('URL needs to be set');
-		let url = (opts.url?.startsWith('http') ? opts.url : (this.url || '') + (opts.url || '')).replace(/([^:]\/)\/+/g, '$1');
-		if(opts.fragment) url.includes('#') ? url.replace(/#.*(\?|\n)/g, (match, arg1) => `#${opts.fragment}${arg1}`) : url += '#' + opts.fragment;
+		let url = opts.url?.startsWith('http') ? opts.url : (this.url || '') + (opts.url || '');
+		url = url.replaceAll(/([^:]\/)\/+/g, '$1');
+		if(opts.fragment) url.includes('#') ? url.replace(/#.*([?\n])/g, (match, arg1) => `#${opts.fragment}${arg1}`) : `${url}#${opts.fragment}`;
 		if(opts.query) {
 			const q = Array.isArray(opts.query) ? opts.query :
 				Object.keys(opts.query).map(k => ({key: k, value: (<any>opts.query)[k]}))

src/index.ts

@@ -4,10 +4,12 @@ export * from './aset';
 export * from './cache';
 export * from './color';
 export * from './csv';
+export * from './database';
 export * from './files';
 export * from './emitter';
 export * from './errors';
 export * from './http';
+export * from './json';
 export * from './jwt';
 export * from './logger';
 export * from './math';
@@ -19,3 +21,4 @@ export * from './search';
 export * from './string';
 export * from './time';
 export * from './types';
+export * from 'var-persist';

src/json.ts

@@ -0,0 +1,40 @@
+/**
+ * Parse JSON but return the original string if it fails
+ *
+ * @param {any} json JSON string to parse
+ * @param fallback Fallback value if unable to parse, defaults to original string
+ * @return {string | T} Object if successful, original string otherwise
+ */
+export function JSONAttemptParse<T1, T2>(json: T2, fallback?: T1): T1 | T2 {
+	try { return JSON.parse(<any>json); }
+	catch { return fallback ?? json; }
+}
+
+/**
+ * Stringifies objects & skips primitives
+ *
+ * @param {any} obj Object to convert to serializable value
+ * @return {string | T} Serialized value
+ */
+export function JSONSerialize<T1>(obj: T1): T1 | string {
+	if(typeof obj == 'object' && obj != null) return JSONSanitize(obj);
+	return obj;
+}
+
+/**
+ * Convert an object to a JSON string avoiding any circular references.
+ *
+ * @param obj Object to convert to JSON
+ * @param {number} space Format the JSON with spaces
+ * @return {string} JSON string
+ */
+export function JSONSanitize(obj: any, space?: number): string {
+	const cache: any[] = [];
+	return JSON.stringify(obj, (key, value) => {
+		if(typeof value === 'object' && value !== null) {
+			if(cache.includes(value)) return '[Circular]';
+			cache.push(value);
+		}
+		return value;
+	}, space);
+}

src/jwt.ts

@@ -1,12 +1,28 @@
-import {JSONAttemptParse} from './objects.ts';
+import {JSONAttemptParse} from './json.ts';
 
 /**
- * Decode a JWT payload, this will not check for tampering so be careful
+ * Creates a JSON Web Token (JWT) using the provided payload.
+ *
+ * @param {object} payload The payload to include in the JWT.
+ * @param signature Add a JWT signature
+ * @return {string} The generated JWT string.
+ */
+export function createJwt(payload: object, signature = 'unsigned'): string {
+	const header = Buffer.from(JSON.stringify({ alg: "HS256", typ: "JWT" }))
+		.toString('base64url');
+	const body = Buffer.from(JSON.stringify(payload))
+		.toString('base64url');
+	// Signature is irrelevant for decodeJwt
+	return `${header}.${body}.${signature}`;
+}
+
+/**
+ * Decode a JSON Web Token (JWT) payload, this will not check for tampering so be careful
  *
  * @param {string} token JWT to decode
  * @return {unknown} JWT payload
  */
-export function jwtDecode<T>(token: string): T {
+export function decodeJwt<T>(token: string): T {
 	const base64 = token.split('.')[1]
 		.replace(/-/g, '+').replace(/_/g, '/');
 	return <T>JSONAttemptParse(decodeURIComponent(atob(base64).split('').map(function(c) {

src/logger.ts

@@ -1,5 +1,5 @@
 import {TypedEmitter, TypedEvents} from './emitter';
-import {JSONSanitize} from './objects.ts';
+import {JSONSanitize} from './json.ts';
 
 export const CliEffects = {
 	CLEAR: "\x1b[0m",
@@ -42,6 +42,8 @@ export const CliBackground = {
 	GREY: "\x1b[100m",
 }
 
+export type LogLevels = 'debug' | 'log' | 'info' | 'warn' | 'error';
+
 export enum LOG_LEVEL {
 	ERROR = 0,
 	WARN = 1,

src/math.ts

@@ -7,25 +7,30 @@
  * ```
  *
  * @param {number} num Number to convert
+ * @param maxDen
  * @return {string} Fraction with remainder
  */
-export function dec2Frac(num: number) {
-	const gcd = (a: number, b: number): number => {
-		if (b < 0.0000001) return a;
-		return gcd(b, ~~(a % b));
-	};
-
-	const len = num.toString().length - 2;
-	let denominator = Math.pow(10, len);
-	let numerator = num * denominator;
-	const divisor = gcd(numerator, denominator);
-	numerator = ~~(numerator / divisor);
-	denominator = ~~(denominator / divisor)
-	const remainder = ~~(numerator / denominator);
-	numerator -= remainder * denominator;
-	return `${remainder ? remainder + ' ' : ''}${~~(numerator)}/${~~(denominator)}`;
+export function dec2Frac(num: number, maxDen=1000): string {
+	let sign = Math.sign(num);
+	num = Math.abs(num);
+	if (Number.isInteger(num)) return (sign * num) + "";
+	let closest = { n: 0, d: 1, diff: Math.abs(num) };
+	for (let d = 1; d <= maxDen; d++) {
+		let n = Math.round(num * d);
+		let diff = Math.abs(num - n / d);
+		if (diff < closest.diff) {
+			closest = { n, d, diff };
+			if (diff < 1e-8) break; // Close enough
+		}
+	}
+	let integer = Math.floor(closest.n / closest.d);
+	let numerator = closest.n - integer * closest.d;
+	return (sign < 0 ? '-' : '') +
+		(integer ? integer + ' ' : '') +
+		(numerator ? numerator + '/' + closest.d : '');
 }
 
+
 /**
  * Convert fraction to decimal number
  *
@@ -43,3 +48,17 @@ export function fracToDec(frac: string) {
 	split = (<string>split.pop()).split('/');
 	return whole + (Number(split[0]) / Number(split[1]));
 }
+
+/**
+ * Add a suffix to a number:
+ * 1 = 1st
+ * 2 = 2nd
+ * 3 = 3rd
+ * N = Nth
+ * @param {number} n
+ * @returns {string}
+ */
+export function numSuffix(n: number): string {
+	const s = ['th', 'st', 'nd', 'rd'], v = n % 100;
+	return `${n}${s[(v - 20) % 10] || s[v] || s[0]}`;
+}

src/misc.ts

@@ -1,6 +1,69 @@
+import {LogLevels} from './logger.ts';
 import {PathEvent} from './path-events.ts';
 import {md5} from './string';
 
+/**
+ * Compare version numbers
+ * @param {string} target
+ * @param {string} vs
+ * @return {number} -1 = target is lower, 0 = equal, 1 = higher
+ */
+export function compareVersions(target: string, vs: string): -1 | 0 | 1 {
+	const [tMajor, tMinor, tPatch] = target.split('.').map(v => +v.replace(/[^0-9]/g, ''));
+	const [vMajor, vMinor, vPatch] = vs.split('.').map(v => +v.replace(/[^0-9]/g, ''));
+	return (tMajor > vMajor || tMinor > vMinor || tPatch > vPatch) ? 1 :
+		(tMajor < vMajor || tMinor < vMinor || tPatch < vPatch) ? -1 : 0;
+}
+
+/**
+ * Create a console object to intercept logs with optional passthrough
+ * @param {null | {debug: Function, log: Function, info: Function, warn: Function, error: Function}} out Passthrough logs, null to silence
+ * @param {{[K in LogLevels]?: LogLevels | "none"}} map Map log levels: {log: 'debug', warn: 'error'} = Suppress debug logs, elevate warnings
+ * @returns {{debug: Function, log: Function, info: Function, warn: Function, error: Function, stderr: string[], stdout: string[]}}
+ */
+export function consoleInterceptor(
+	out: null | {debug: Function, log: Function, info: Function, warn: Function, error: Function} = console,
+	map?: {[K in LogLevels]?: LogLevels | 'none'}
+): {debug: Function, log: Function, info: Function, warn: Function, error: Function, output: {debug: any[], log: any[], info: any[], warn: any[], error: any[], stderr: any[], stdout: any[]}} {
+	const logs: any = {debug: [], log: [], info: [], warn: [], error: [], stderr: [], stdout: [],}
+	const cWrapper = (type: 'debug' | 'log' | 'info' | 'warn' | 'error') => ((...args: any[]) => {
+		if(out) out[type](...args);
+		logs[type].push(...args);
+		if(type == 'error') logs.stderr.push(...args);
+		else logs.stdout.push(...args);
+	});
+	return {
+		debug: map?.debug != 'none' ? cWrapper(map?.debug || 'debug') : () => {},
+		log: map?.log != 'none' ? cWrapper(map?.log || 'log') : () => {},
+		info: map?.info != 'none' ? cWrapper(map?.info || 'info') : () => {},
+		warn: map?.warn != 'none' ? cWrapper(map?.warn || 'warn') : () => {},
+		error: map?.error != 'none' ? cWrapper(map?.error || 'error') : () => {},
+		output: logs
+	}
+}
+
+
+/**
+ * Escape any regex special characters to avoid misinterpretation during search
+ * @param {string} value String which should be escaped
+ * @return {string} New escaped sequence
+ */
+export function escapeRegex(value: string) {
+	return value.replace(/[.*+?^${}()|\[\]\\]/g, '\\$&');
+}
+
+/**
+ * Run a stringified function with arguments asynchronously
+ * @param {object} args Map of key/value arguments
+ * @param {string} fn Function as string
+ * @param {boolean} async Run with async (returns a promise)
+ * @return {T | Promise<T>} Function return result
+ */
+export function fn<T>(args: object, fn: string, async: boolean = false): T {
+	const keys = Object.keys(args);
+	return new Function(...keys, `return (${async ? 'async ' : ''}(${keys.join(',')}) => { ${fn} })(${keys.join(',')})`)(...keys.map(k => (<any>args)[k]));
+}
+
 /**
  * Get profile image from Gravatar
  *
@@ -14,14 +77,36 @@ export function gravatar(email: string, def='mp') {
 }
 
 /**
- * Escape any regex special characters to avoid misinterpretation during search
- *
- * @param {string} value String which should be escaped
- * @return {string} New escaped sequence
+ * Convert IPv6 to v4 because who uses that, NAT4Life
+ * @param {string} ip IPv6 address, e.g. 2001:0db8:85a3:0000:0000:8a2e:0370:7334
+ * @returns {string | null} IPv4 address, e.g. 172.16.58.3
  */
-export function escapeRegex(value: string) {
-	return value.replace(/[.*+?^${}()|\[\]\\]/g, '\\$&');
+export function ipV6ToV4(ip: string) {
+	if(!ip) return null;
+	const ipv4 = ip.split(':').splice(-1)[0];
+	if(ipv4 == '1') return '127.0.0.1';
+	return ipv4;
 }
 
+/**
+ * Check if IP is reserved, e.g. localhost, private IPs, etc.
+ * @param {string} ip
+ * @returns {boolean}
+ */
+export function reservedIp(ip: string): boolean {
+	if(ip == 'localhost' || ip == '127.0.0.1') return true;
+	return /\b(10\.(?:[0-9]{1,3}\.){2}[0-9]{1,3})\b|\b(172\.(?:1[6-9]|2[0-9]|3[0-1])\.(?:[0-9]{1,3}\.)[0-9]{1,3})\b|\b(192\.168\.(?:[0-9]{1,3}\.)[0-9]{1,3})\b/.test(ip);
+}
+
+
+/**
+ * Represents a function that listens for events and handles them accordingly.
+ *
+ * @param {PathEvent} event - The event object containing data related to the triggered event.
+ * @param {...any} args - Additional arguments that may be passed to the listener.
+ * @returns {any} The return value of the listener, which can vary based on implementation.
+ */
 export type Listener = (event: PathEvent, ...args: any[]) => any;
+
+/** Represents a function that can be called to unsubscribe from an event, stream, or observer */
 export type Unsubscribe = () => void;

src/objects.ts

@@ -1,3 +1,54 @@
+import {JSONSanitize} from './json.ts';
+
+export type Delta = { [key: string]: any | Delta | null };
+
+/**
+ * Applies deltas to `target`.
+ * @param base starting point
+ * @param deltas List of deltas to apply
+ * @returns Mutated target
+ */
+export function applyDeltas(base: any, ...deltas: any[]): any {
+	function applyDelta(base: any, delta: any): any {
+		if(delta === null) return null;
+		if(typeof base !== 'object' || base === null) return delta === undefined ? base : delta;
+		const result = Array.isArray(base) ? [...base] : { ...base };
+		for(const key in delta) {
+			const val = delta[key];
+			if(val === undefined) delete result[key];
+			else if(typeof val === 'object' && val !== null && !Array.isArray(val)) result[key] = applyDelta(result[key], val);
+			else result[key] = val;
+		}
+		return result;
+	}
+
+	for(const d of deltas.flat()) base = applyDelta(base, d?.delta ?? d);
+	return base;
+}
+
+/**
+ * Creates a nested delta that reverts `target` back to `old`.
+ * @param old - Original object
+ * @param updated - Modified object
+ * @returns New changes
+ */
+export function calcDelta(old: any, updated: any): any {
+	if(updated == null) return null; // full delete
+	const delta: any = {};
+	const isObj = (v: any) => v && typeof v === 'object' && !Array.isArray(v);
+	for (const key of new Set([...(old ? Object.keys(old) : []), ...(updated ? Object.keys(updated) : [])])) {
+		const oldVal = old?.[key];
+		const newVal = updated?.[key];
+		if(isObj(oldVal) && isObj(newVal)) {
+			const nested = calcDelta(oldVal, newVal);
+			if(nested !== null && Object.keys(nested).length > 0) delta[key] = nested;
+		} else if(JSON.stringify(oldVal) !== JSON.stringify(newVal)) {
+			delta[key] = newVal;
+		}
+	}
+	return Object.keys(delta).length === 0 ? {} : delta;
+}
+
 /**
  * Removes any null values from an object in-place
  *
@@ -14,7 +65,7 @@
 export function clean<T>(obj: T, undefinedOnly = false): Partial<T> {
 	if(obj == null) throw new Error("Cannot clean a NULL value");
 	if(Array.isArray(obj)) {
-		obj = <any>obj.filter(o => o != null);
+		obj = <any>obj.filter(o => undefinedOnly ? o !== undefined : o != null);
 	} else {
 		Object.entries(obj).forEach(([key, value]) => {
 			if((undefinedOnly && value === undefined) || (!undefinedOnly && value == null)) delete (<any>obj)[key];
@@ -109,7 +160,6 @@ export function encodeQuery(data: any): string {
 	).join('&');
 }
 
-
 /**
  * Recursively flatten a nested object, while maintaining key structure
  *
@@ -129,7 +179,6 @@ export function flattenObj(obj: any, parent?: any, result: any = {}) {
 		for(const key of Object.keys(obj)) {
 			const propName = parent ? `${parent}.${key}` : key;
 			if(typeof obj[key] === 'object' && obj[key] != null && !Array.isArray(obj[key])) {
-				console.log(propName, );
 				flattenObj(obj[key], propName, result);
 			} else {
 				result[propName] = obj[key];
@@ -179,19 +228,51 @@ export function includes(target: any, values: any, allowMissing = false): boolea
 }
 
 /**
- * Deep check if two objects are equal
+ * Deep check if two items are equal.
+ * Handles primitives, objects, arrays, functions, Date, RegExp, and circular references.
  *
  * @param {any} a - first item to compare
  * @param {any} b - second item to compare
+ * @param {WeakMap<object, object>} [seen] - Internal parameter to track circular references
  * @returns {boolean} True if they match
  */
-export function isEqual(a: any, b: any): boolean {
-	const ta = typeof a, tb = typeof b;
-	if((ta != 'object' || a == null) || (tb != 'object' || b == null))
-		return ta == 'function' && tb == 'function' ? a.toString() == b.toString() : a === b;
-	const keys = Object.keys(a);
-	if(keys.length != Object.keys(b).length) return false;
-	return Object.keys(a).every(key => isEqual(a[key], b[key]));
+export function isEqual(a: any, b: any, seen = new WeakMap<object, object>()): boolean {
+	// Simple cases
+	if(a === b) return true;
+	if(a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();
+	if(a instanceof RegExp && b instanceof RegExp) return a.source === b.source && a.flags === b.flags;
+
+	// Null checks
+	if(typeof a !== 'object' || a === null || typeof b !== 'object' || b === null) {
+		if(Number.isNaN(a) && Number.isNaN(b)) return true;
+		if(typeof a === 'function' && typeof b === 'function') return a.toString() === b.toString()
+		return false;
+	}
+
+	// Circular references
+	if(seen.has(a)) return seen.get(a) === b;
+	seen.set(a, b);
+	const isArrayA = Array.isArray(a);
+	const isArrayB = Array.isArray(b);
+
+	// Array checks
+	if(isArrayA && isArrayB) {
+		if(a.length !== b.length) return false;
+		for(let i = 0; i < a.length; i++) {
+			if(!isEqual(a[i], b[i], seen)) return false;
+		}
+		return true;
+	}
+	if(isArrayA !== isArrayB) return false;
+
+	// Key & value deep comparison
+	const keysA = Object.keys(a);
+	const keysB = Object.keys(b);
+	if(keysA.length !== keysB.length) return false;
+	for(const key of keysA) {
+		if(!Object.prototype.hasOwnProperty.call(b, key) || !isEqual(a[key], b[key], seen)) return false;
+	}
+	return true;
 }
 
 /**
@@ -214,39 +295,12 @@ export function mixin(target: any, constructors: any[]) {
 }
 
 /**
- * Parse JSON but return the original string if it fails
- *
- * @param {any} json JSON string to parse
- * @return {string | T} Object if successful, original string otherwise
+ * Run a map function on each property
+ * @param obj Object that will be iterated
+ * @param {(key: string, value: any) => any} fn Transformer function - receives key & value
+ * @returns {{}}
  */
-export function JSONAttemptParse<T1, T2>(json: T2): T1 | T2 {
-	try { return JSON.parse(<any>json); }
-	catch { return json; }
-}
-
-/**
- * Stringifies objects & skips primitives
- *
- * @param {any} obj Object to convert to serializable value
- * @return {string | T} Serialized value
- */
-export function JSONSerialize<T1>(obj: T1): T1 | string {
-	if(typeof obj == 'object' && obj != null) return JSONSanitize(obj);
-	return obj;
-}
-
-/**
- * Convert an object to a JSON string avoiding any circular references.
- *
- * @param obj Object to convert to JSON
- * @param {number} space Format the JSON with spaces
- * @return {string} JSON string
- */
-export function JSONSanitize(obj: any, space?: number): string {
-	let cache: any[] = [];
-	return JSON.stringify(obj, (key, value) => {
-		if(typeof value === 'object' && value !== null)
-			if(!cache.includes(value)) cache.push(value);
-		return value;
-	}, space);
+export function objectMap<T>(obj: any, fn: (key: string, value: any) => any): T {
+	return <any>Object.entries(obj).map(([key, value]: [string, any]) => [key, fn(key, value)])
+		.reduce((acc, [key, value]) => ({ ...acc, [key]: value }), {});
 }

src/path-events.ts

@@ -31,7 +31,7 @@ export function PE(str: TemplateStringsArray, ...args: any[]) {
 		if(str[i]) combined.push(str[i]);
 		if(args[i]) combined.push(args[i]);
 	}
-	return new PathEvent(combined.join(''));
+	return new PathEvent(combined.join('/'));
 }
 
 /**
@@ -48,7 +48,7 @@ export function PES(str: TemplateStringsArray, ...args: any[]) {
 		if(str[i]) combined.push(str[i]);
 		if(args[i]) combined.push(args[i]);
 	}
-	const [paths, methods] = combined.join('').split(':');
+	const [paths, methods] = combined.join('/').split(':');
 	return PathEvent.toString(paths, <any>methods?.split(''));
 }
 
@@ -71,43 +71,64 @@ export class PathEvent {
 	/** List of methods */
 	methods!: ASet<Method>;
 
+	/** Internal cache for PathEvent instances to avoid redundant parsing */
+	private static pathEventCache: Map<string, PathEvent> = new Map();
+
 	/** All/Wildcard specified */
 	get all(): boolean { return this.methods.has('*') }
-	set all(v: boolean) { v ? new ASet<Method>(['*']) : this.methods.delete('*'); }
+	set all(v: boolean) { v ? this.methods = new ASet<Method>(['*']) : this.methods.delete('*'); }
 	/** None specified */
 	get none(): boolean { return this.methods.has('n') }
 	set none(v: boolean) { v ? this.methods = new ASet<Method>(['n']) : this.methods.delete('n'); }
 	/** Create method specified */
 	get create(): boolean { return !this.methods.has('n') && (this.methods.has('*') || this.methods.has('c')) }
-	set create(v: boolean) { v ? this.methods.delete('n').add('c') : this.methods.delete('c'); }
+	set create(v: boolean) { v ? this.methods.delete('n').delete('*').add('c') : this.methods.delete('c'); }
 	/** Read method specified */
 	get read(): boolean { return !this.methods.has('n') && (this.methods.has('*') || this.methods.has('r')) }
-	set read(v: boolean) { v ? this.methods.delete('n').add('r') : this.methods.delete('r'); }
+	set read(v: boolean) { v ? this.methods.delete('n').delete('*').add('r') : this.methods.delete('r'); }
 	/** Update method specified */
 	get update(): boolean { return !this.methods.has('n') && (this.methods.has('*') || this.methods.has('u')) }
-	set update(v: boolean) { v ? this.methods.delete('n').add('u') : this.methods.delete('u'); }
+	set update(v: boolean) { v ? this.methods.delete('n').delete('*').add('u') : this.methods.delete('u'); }
 	/** Delete method specified */
 	get delete(): boolean { return !this.methods.has('n') && (this.methods.has('*') || this.methods.has('d')) }
-	set delete(v: boolean) { v ? this.methods.delete('n').add('d') : this.methods.delete('d'); }
+	set delete(v: boolean) { v ? this.methods.delete('n').delete('*').add('d') : this.methods.delete('d'); }
 
-	constructor(Event: string | PathEvent) {
-		if(typeof Event == 'object') return Object.assign(this, Event);
-		let [p, scope, method] = Event.replaceAll(/\/{2,}/g, '/').split(':');
+	constructor(e: string | PathEvent) {
+		if(typeof e == 'object') {
+			Object.assign(this, e);
+			return;
+		}
+
+		// Check cache first
+		if (PathEvent.pathEventCache.has(e)) {
+			Object.assign(this, PathEvent.pathEventCache.get(e)!);
+			return;
+		}
+
+		let [p, scope, method] = e.replaceAll(/\/{2,}/g, '/').split(':');
 		if(!method) method = scope || '*';
-		if(p == '*' || !p && method == '*') {
+		if(p == '*' || (!p && method == '*')) {
 			p = '';
 			method = '*';
 		}
 		let temp = p.split('/').filter(p => !!p);
-		this.module = temp.splice(0, 1)[0]?.toLowerCase() || '';
-		this.fullPath = p;
+		this.module = temp.splice(0, 1)[0] || '';
 		this.path = temp.join('/');
+		this.fullPath = `${this.module}${this.module && this.path ? '/' : ''}${this.path}`;
 		this.name = temp.pop() || '';
 		this.methods = new ASet(<any>method.split(''));
+
+		// Store in cache
+		PathEvent.pathEventCache.set(e, this);
+	}
+
+	/** Clear the cache of all PathEvents */
+	static clearCache(): void {
+		PathEvent.pathEventCache.clear();
 	}
 
 	/**
-	 * Combine multiple  events into one parsed object. Longest path takes precedent, but all subsequent methods are
+	 * Combine multiple events into one parsed object. Longest path takes precedent, but all subsequent methods are
 	 * combined until a "none" is reached
 	 *
 	 * @param {string | PathEvent} paths Events as strings or pre-parsed
@@ -115,18 +136,18 @@ export class PathEvent {
 	 */
 	static combine(...paths: (string | PathEvent)[]): PathEvent {
 		let hitNone = false;
-		const combined = paths.map(p => new PathEvent(p))
+		const combined = paths.map(p => p instanceof PathEvent ? p : new PathEvent(p))
 			.toSorted((p1, p2) => {
 				const l1 = p1.fullPath.length, l2 = p2.fullPath.length;
 				return l1 < l2 ? 1 : (l1 > l2 ? -1 : 0);
 			}).reduce((acc, p) => {
+				if(acc && !acc.fullPath.startsWith(p.fullPath)) return acc;
 				if(p.none) hitNone = true;
 				if(!acc) return p;
 				if(hitNone) return acc;
-				acc.methods = [...acc.methods, ...p.methods];
+				acc.methods = new ASet([...acc.methods, ...p.methods]);
 				return acc;
 			}, <any>null);
-		combined.methods = new ASet<Method>(combined.methods);
 		return combined;
 	}
 
@@ -138,14 +159,16 @@ export class PathEvent {
 	 * @return {boolean} Whether there is any overlap
 	 */
 	static filter(target: string | PathEvent | (string | PathEvent)[], ...filter: (string | PathEvent)[]): PathEvent[] {
-		const parsedTarget = makeArray(target).map(pe => new PathEvent(pe));
-		const parsedFind = makeArray(filter).map(pe => new PathEvent(pe));
-		return parsedTarget.filter(t => {
-			if(!t.fullPath && t.all) return true;
-			return !!parsedFind.find(f =>
-				(t.fullPath.startsWith(f.fullPath) || f.fullPath.startsWith(t.fullPath)) &&
-				(f.all || t.all || t.methods.intersection(f.methods).length));
-		});
+		const parsedTarget = makeArray(target).map(pe => pe instanceof PathEvent ? pe : new PathEvent(pe));
+		const parsedFilter = makeArray(filter).map(pe => pe instanceof PathEvent ? pe : new PathEvent(pe));
+		return parsedTarget.filter(t => !!parsedFilter.find(r => {
+			const wildcard = r.fullPath == '*' || t.fullPath == '*';
+			const p1 = r.fullPath.includes('*') ? r.fullPath.slice(0, r.fullPath.indexOf('*')) : r.fullPath;
+			const p2 = t.fullPath.includes('*') ? t.fullPath.slice(0, t.fullPath.indexOf('*')) : t.fullPath;
+			const scope = p1.startsWith(p2) || p2.startsWith(p1);
+			const methods = r.all || t.all || r.methods.intersection(t.methods).length;
+			return (wildcard || scope) && methods;
+		}));
 	}
 
 	/**
@@ -156,15 +179,16 @@ export class PathEvent {
 	 * @return {boolean} Whether there is any overlap
 	 */
 	static has(target: string | PathEvent | (string | PathEvent)[], ...has: (string | PathEvent)[]): boolean {
-		const parsedRequired = makeArray(has).map(pe => new PathEvent(pe));
-		const parsedTarget = makeArray(target).map(pe => new PathEvent(pe));
-		return !!parsedRequired.find(r => {
-			if(!r.fullPath && r.all) return true;
-			const filtered = parsedTarget.filter(p => r.fullPath.startsWith(p.fullPath));
-			if(!filtered.length) return false;
-			const combined = PathEvent.combine(...filtered);
-			return (!combined.none && (combined.all || r.all)) || combined.methods.intersection(r.methods).length;
-		});
+		const parsedTarget = makeArray(target).map(pe => pe instanceof PathEvent ? pe : new PathEvent(pe));
+		const parsedRequired = makeArray(has).map(pe => pe instanceof PathEvent ? pe : new PathEvent(pe));
+		return !!parsedRequired.find(r => !!parsedTarget.find(t => {
+			const wildcard = r.fullPath == '*' || t.fullPath == '*';
+			const p1 = r.fullPath.includes('*') ? r.fullPath.slice(0, r.fullPath.indexOf('*')) : r.fullPath;
+			const p2 = t.fullPath.includes('*') ? t.fullPath.slice(0, t.fullPath.indexOf('*')) : t.fullPath;
+			const scope = p1.startsWith(p2); // Note: Original had || p2.startsWith(p1) here, but has implies target has required.
+			const methods = r.all || t.all || r.methods.intersection(t.methods).length;
+			return (wildcard || scope) && methods;
+		}));
 	}
 
 	/**
@@ -199,19 +223,57 @@ export class PathEvent {
 	}
 
 	/**
-	 * Create  event string from its components
+	 * Create event string from its components
 	 *
 	 * @param {string | string[]} path Event path
 	 * @param {Method} methods Event method
 	 * @return {string} String representation of Event
 	 */
 	static toString(path: string | string[], methods: Method | Method[]): string {
-		let p = makeArray(path).filter(p => p != null).join('/');
+		let p = makeArray(path).filter(p => !!p).join('/');
 		p = p?.trim().replaceAll(/\/{2,}/g, '/').replaceAll(/(^\/|\/$)/g, '');
 		if(methods?.length) p += `:${makeArray(methods).map(m => m.toLowerCase()).join('')}`;
 		return p;
 	}
 
+	/**
+	 * Squash 2 sets of paths & return true if any overlap is found
+	 *
+	 * @param has Target must have at least one of these path
+	 * @return {boolean} Whether there is any overlap
+	 */
+	has(...has: (string | PathEvent)[]): boolean {
+		return PathEvent.has(this, ...has);
+	}
+
+	/**
+	 * Squash 2 sets of paths & return true if the target has all paths
+	 *
+	 * @param has Target must have all these paths
+	 * @return {boolean} Whether there is any overlap
+	 */
+	hasAll(...has: (string | PathEvent)[]): boolean {
+		return PathEvent.hasAll(this, ...has);
+	}
+
+	/**
+	 * Same as `has` but raises an error if there is no overlap
+	 *
+	 * @param has Target must have at least one of these path
+	 */
+	hasFatal(...has: (string | PathEvent)[]): void {
+		return PathEvent.hasFatal(this, ...has);
+	}
+
+	/**
+	 * Same as `hasAll` but raises an error if the target is missing any paths
+	 *
+	 * @param has Target must have all these paths
+	 */
+	hasAllFatal(...has: (string | PathEvent)[]): void {
+		return PathEvent.hasAllFatal(this, ...has);
+	}
+
 	/**
 	 * Filter a set of paths based on this event
 	 *
@@ -223,7 +285,7 @@ export class PathEvent {
 	}
 
 	/**
-	 * Create  event string from its components
+	 * Create event string from its components
 	 *
 	 * @return {string} String representation of Event
 	 */
@@ -235,11 +297,12 @@ export class PathEvent {
 export type PathListener = (event: PathEvent, ...args: any[]) => any;
 export type PathUnsubscribe = () => void;
 
+export type Event = string | PathEvent;
 export interface IPathEventEmitter {
-	emit(event: string, ...args: any[]): void;
+	emit(event: Event, ...args: any[]): void;
 	off(listener: PathListener): void;
-	on(event: string, listener: PathListener): PathUnsubscribe;
-	once(event: string, listener?: PathListener): Promise<any>;
+	on(event: Event | Event[], listener: PathListener): PathUnsubscribe;
+	once(event: Event | Event[], listener?: PathListener): Promise<any>;
 	relayEvents(emitter: PathEventEmitter): void;
 }
 
@@ -249,9 +312,11 @@ export interface IPathEventEmitter {
 export class PathEventEmitter implements IPathEventEmitter{
 	private listeners: [PathEvent, PathListener][] = [];
 
-	emit(event: string | PathEvent, ...args: any[]) {
-		const parsed = new PathEvent(event);
-		this.listeners.filter(l => PathEvent.has(l[0], event))
+	constructor(public readonly prefix: string = '') { }
+
+	emit(event: Event, ...args: any[]) {
+		const parsed = event instanceof PathEvent ? event : new PathEvent(`${this.prefix}/${event}`);
+		this.listeners.filter(l => PathEvent.has(l[0], parsed))
 			.forEach(async l => l[1](parsed, ...args));
 	};
 
@@ -259,12 +324,18 @@ export class PathEventEmitter implements IPathEventEmitter{
 		this.listeners = this.listeners.filter(l => l[1] != listener);
 	}
 
-	on(event: string | string[], listener: PathListener): PathUnsubscribe {
-		makeArray(event).forEach(e => this.listeners.push([new PathEvent(e), listener]));
+	on(event: Event | Event[], listener: PathListener): PathUnsubscribe {
+		makeArray(event).forEach(e => {
+			if(typeof e == 'string' && e[0] == '*' && this.prefix) e = e.slice(1);
+			this.listeners.push([
+				e instanceof PathEvent ? e : new PathEvent(`${this.prefix}/${e}`),
+				listener
+			])
+		});
 		return () => this.off(listener);
 	}
 
-	once(event: string | string[], listener?: PathListener): Promise<any> {
+	once(event: Event | Event[], listener?: PathListener): Promise<any> {
 		return new Promise(res => {
 			const unsubscribe = this.on(event, (event: PathEvent, ...args: any[]) => {
 				res(args.length < 2 ? args[0] : args);

src/search.ts

@@ -1,38 +1,71 @@
-import {dotNotation, JSONAttemptParse} from './objects';
+import {JSONAttemptParse, JSONSerialize} from './json.ts';
+import {dotNotation} from './objects.ts';
 
+/**
+ * Filters an array of objects based on a search term and optional regex checking.
+ *
+ * @param {Array} rows Array of objects to filter
+ * @param {string} search The logic string or regext to filter on
+ * @param {boolean} [regex=false] Treat search expression as regex
+ * @param {Function} [transform=(r) => r] - Transform rows before filtering
+ * @return {Array} The filtered array of objects that matched search
+ */
 export function search(rows: any[], search: string, regex?: boolean, transform: Function = (r: any) => r) {
 	if(!rows) return [];
 	return rows.filter(r => {
 		// Empty search
-		const value = transform(r);
 		if(!search) return true;
+		const value = transform(r);
 		// Regex search
 		if(regex) {
 			return !!Object.values(value).filter((v: any) => {
 				try { return RegExp(search, 'gm').test(v.toString()); }
 				catch { return false; }
 			}).length
+		} else {
+			return logicTest(value, search);
 		}
-		// Make sure at least one OR passes
-		const or = search.split('||').map(p => p.trim()).filter(p => !!p);
-		return -1 != or.findIndex(p => {
-			// Make sure all ANDs pass
-			const and = p.split('&&').map(p => p.trim()).filter(p => !!p);
-			return and.filter(p => {
-				// Boolean operator
-				const prop = /(\w+)\s*(==?|!=|>=|>|<=|<)\s*(\w+)/g.exec(p);
-				if(prop) {
-					const a = JSON.stringify(JSONAttemptParse(dotNotation<any>(value, prop[1])));
-					const operator = prop[2] == '=' ? '==' : prop[2];
-					const b = JSON.stringify(JSONAttemptParse(prop[3]));
-					return eval(`${a} ${operator} ${b}`);
-				}
-				// Case-sensitive
-				const v = Object.values(value).join('');
-				if(/[A-Z]/g.test(search)) return v.includes(p);
-				// Case-insensitive
-				return v.toLowerCase().includes(p);
-			}).length == and.length;
-		})
+	});
+}
+
+/**
+ * Test an object against a logic condition. By default values are checked
+ * @param {string} condition
+ * @param {object} target
+ * @return {boolean}
+ */
+export function logicTest(target: object, condition: string): boolean {
+	const evalBoolean = (a: any, op: string, b: any): boolean => {
+		switch(op) {
+			case '=':
+			case '==': return a == b;
+			case '!=': return a != b;
+			case '+=': return a?.toString().includes(b);
+			case '-=': return !a?.toString().includes(b);
+			case '>': return a > b;
+			case '>=': return a >= b;
+			case '<': return a < b;
+			case '<=': return a <= b;
+			default: return false;
+		}
+	}
+
+	const or = condition.split('||').map(p => p.trim()).filter(p => !!p);
+	return -1 != or.findIndex(p => {
+		// Make sure all ANDs pass
+		const and = p.split('&&').map(p => p.trim()).filter(p => !!p);
+		return and.filter(p => {
+			// Boolean operator
+			const prop = /(\S+)\s*(==?|!=|\+=|-=|>=|>|<=|<)\s*(\S+)/g.exec(p);
+			if(prop) {
+				const key = Object.keys(target).find(k => k.toLowerCase() == prop[1].toLowerCase());
+				return evalBoolean(dotNotation<any>(target, key || prop[1]),  prop[2], JSONAttemptParse(prop[3]));
+			}
+			// Case-sensitive
+			const v = Object.values(target).map(JSONSerialize).join('');
+			if(/[A-Z]/g.test(condition)) return v.includes(p);
+			// Case-insensitive
+			return v.toLowerCase().includes(p);
+		}).length == and.length;
 	});
 }

src/string.ts

@@ -18,6 +18,16 @@ export const SYMBOL_LIST = '~`!@#$%^&*()_-+={[}]|\\:;"\'<,>.?/';
  */
 export const CHAR_LIST = LETTER_LIST + LETTER_LIST.toLowerCase() + NUMBER_LIST + SYMBOL_LIST;
 
+/**
+ * Converts text to camelCase
+ */
+export function camelCase(str?: string): string {
+	if(!str) return '';
+	const pascal = pascalCase(str);
+	return pascal.charAt(0).toLowerCase() + pascal.slice(1);
+}
+
+
 /**
  * Convert number of bytes into a human-readable size
  *
@@ -33,6 +43,24 @@ export function formatBytes(bytes: number, decimals = 2) {
 	return parseFloat((bytes / Math.pow(k, i)).toFixed(decimals)) + ' ' + sizes[i];
 }
 
+/**
+ * Convert milliseconds to human-readable duration
+ * @param {string} ms milliseconds
+ * @param {boolean} short Use unit initial instead of word
+ * @return {string} formated duration
+ */
+export function formatMs(ms: number, short = false): string {
+	if (isNaN(ms) || ms < 0) return "Invalid input";
+	const seconds = ms / 1000;
+	const minutes = seconds / 60;
+	const hours = minutes / 60;
+	const days = hours / 24;
+	if (days >= 1) return `${days.toFixed(1)} ${short ? 'd' : 'days'}`;
+	else if (hours >= 1) return `${hours.toFixed(1)} ${short ? 'h' : 'hours'}`;
+	else if (minutes >= 1) return `${minutes.toFixed(1)} ${short ? 'm' : 'minutes'}`;
+	else return `${seconds.toFixed(1)} ${short ? 's' : 'seconds'}`;
+}
+
 /**
  * Extract numbers from a string & create a formated phone number: +1 (123) 456-7890
  *
@@ -64,6 +92,15 @@ export function insertAt(target: string, str: string, index: number): String {
 	return `${target.slice(0, index)}${str}${target.slice(index + 1)}`;
 }
 
+/**
+ * Converts text to kebab-case
+ */
+export function kebabCase(str?: string): string {
+	if(!str) return '';
+	return wordSegments(str).map(w => w.toLowerCase()).join("-");
+}
+
+
 /**
  * Add padding to string
  *
@@ -86,6 +123,20 @@ export function pad(text: any, length: number, char: string = ' ', start = true)
 	return text.toString().padEnd(length, char);
 }
 
+/**
+ * Convert text to PascalCase
+ * @param {string} str
+ * @return {string}
+ */
+export function pascalCase(str?: string): string {
+	if(!str) return '';
+	return wordSegments(str)
+		.map((w) => w.charAt(0).toUpperCase() + w.slice(1).toLowerCase())
+		.join('');
+}
+
+
+
 /**
  * Generate a random hexadecimal value
  *
@@ -149,6 +200,15 @@ export function randomStringBuilder(length: number, letters = false, numbers = f
 	}).join('');
 }
 
+/**
+ * Converts text to snake_case
+ */
+export function snakeCase(str?: string): string {
+	if(!str) return '';
+	return wordSegments(str).map(w => w.toLowerCase()).join("_");
+}
+
+
 /**
  * Splice a string together (Similar to Array.splice)
  *
@@ -255,6 +315,23 @@ export function md5(d: string)  {
 	function bit_rol(d:any,_:any){return d<<_|d>>>32-_
 }
 
+/**
+ * Splits a string into logical word segments
+ */
+export function wordSegments(str?: string): string[] {
+	if (!str) return [];
+	return str
+		.replace(/([a-z])([A-Z])/g, "$1 $2")
+		.replace(/([A-Z]+)([A-Z][a-z])/g, "$1 $2")
+		.replace(/([0-9]+)([a-zA-Z])/g, "$1 $2")
+		.replace(/([a-zA-Z])([0-9]+)/g, "$1 $2")
+		.replace(/[_\-\s]+/g, " ")
+		.trim()
+		.split(/\s+/)
+		.filter(Boolean);
+}
+
+
 /**
  * Check if email is valid
  *

src/time.ts

@@ -20,119 +20,178 @@ export function adjustedInterval(cb: Function, ms: number) {
 	}
 }
 
+export function dayOfWeek(d: number): string {
+	return ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][d];
+}
+
+export function dayOfYear(date: Date): number {
+	const start = new Date(Date.UTC(date.getUTCFullYear(), 0, 1));
+	return Math.ceil((date.getTime() - start.getTime()) / (1000 * 60 * 60 * 24));
+}
+
 /**
  * Format date
  *
+ * Year:
+ * - YYYY = 2025 (4-digit year)
+ * - YY = 25 (2-digit year)
+ *
+ * Month:
+ * - MMMM = January (full month name)
+ * - MMM = Jan (abbreviated month name)
+ * - MM = 01 (zero-padded month number)
+ * - M = 1 (month number)
+ *
+ * Day:
+ * - DDD = 123 (day of year)
+ * - DD = 01 (zero-padded day)
+ * - Do = 1st (day with ordinal suffix)
+ * - D = 1 (day number)
+ * - dddd = Monday (full day name)
+ * - ddd = Mon (abbreviated day name)
+ *
+ * Hour:
+ * - HH = 13 (24-hour format, zero-padded)
+ * - H = 13 (24-hour format)
+ * - hh = 01 (12-hour format, zero-padded)
+ * - h = 1 (12-hour format)
+ *
+ * Minute:
+ * - mm = 05 (zero-padded minutes)
+ * - m = 5 (minutes)
+ *
+ * Second:
+ * - ss = 09 (zero-padded seconds)
+ * - s = 9 (seconds)
+ *
+ * Millisecond:
+ * - SSS = 123 (3-digit milliseconds)
+ *
+ * AM/PM:
+ * - A = AM/PM (uppercase)
+ * - a = am/pm (lowercase)
+ *
+ * Timezone:
+ * - ZZ = +0500 (timezone offset without colon)
+ * - Z = +05:00 (timezone offset with colon)
+ * - z = EST (timezone abbreviation)
+ *
  * @param {string} format How date string will be formatted, default: `YYYY-MM-DD H:mm A`
  * @param {Date | number | string} date Date or timestamp, defaults to now
  * @param tz Set timezone offset
  * @return {string} Formated date
  */
-export function formatDate(format = 'YYYY-MM-DD H:mm', date: Date | number | string = new Date(), tz?: string | number): string {
-	const timezones = [
-		['IDLW', -12],
-		['SST', -11],
-		['HST', -10],
-		['AKST', -9],
-		['PST', -8],
-		['MST', -7],
-		['CST', -6],
-		['EST', -5],
-		['AST', -4],
-		['BRT', -3],
-		['MAT', -2],
-		['AZOT', -1],
-		['UTC', 0],
-		['CET', 1],
-		['EET', 2],
-		['MSK', 3],
-		['AST', 4],
-		['PKT', 5],
-		['IST', 5.5],
-		['BST', 6],
-		['ICT', 7],
-		['CST', 8],
-		['JST', 9],
-		['AEST', 10],
-		['SBT', 11],
-		['FJT', 12],
-		['TOT', 13],
-		['LINT', 14]
-	];
+export function formatDate(format: string = 'YYYY-MM-DD H:mm', date: Date | number | string = new Date(), tz: string | number = 'local'): string {
+	if (typeof date === 'number' || typeof date === 'string') date = new Date(date);
+	if (isNaN(date.getTime())) throw new Error('Invalid date input');
+	const numericTz = typeof tz === 'number';
+	const localTz = tz === 'local' || (!numericTz && tz.toLowerCase?.() === 'local');
+	const tzName = localTz ? Intl.DateTimeFormat().resolvedOptions().timeZone : numericTz ? 'UTC' : tz;
 
-	function adjustTz(date: Date, gmt: number) {
-		const currentOffset = date.getTimezoneOffset();
-		const adjustedOffset = gmt * 60;
-		return new Date(date.getTime() + (adjustedOffset + currentOffset) * 60000);
-	}
-
-	function day(num: number): string {
-		return ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][num] || 'Unknown';
-	}
-
-	function doy(date: Date) {
-		const start = new Date(`${date.getFullYear()}-01-01 0:00:00`);
-		return Math.ceil((date.getTime() - start.getTime()) / (1000 * 60 * 60 * 24));
-	}
-
-	function month(num: number): string {
-		return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][num] || 'Unknown';
-	}
-
-	function suffix(num: number) {
-		if (num % 100 >= 11 && num % 100 <= 13) return `${num}th`;
-		switch (num % 10) {
-			case 1: return `${num}st`;
-			case 2: return `${num}nd`;
-			case 3: return `${num}rd`;
-			default: return `${num}th`;
+	if (!numericTz && tzName !== 'UTC') {
+		try {
+			new Intl.DateTimeFormat('en-US', { timeZone: tzName }).format();
+		} catch {
+			throw new Error(`Invalid timezone: ${tzName}`);
 		}
 	}
 
-	function tzOffset(offset: number) {
-		const hours = ~~(offset / 60);
-		const minutes = offset % 60;
-		return (offset > 0 ? '-' : '') + `${hours}:${minutes.toString().padStart(2, '0')}`;
+	let zonedDate = new Date(date);
+	let get: (fn: 'FullYear' | 'Month' | 'Date' | 'Day' | 'Hours' | 'Minutes' | 'Seconds' | 'Milliseconds') => number;
+	const partsMap: Record<string, string> = {};
+	if (!numericTz && tzName !== 'UTC') {
+		const parts = new Intl.DateTimeFormat('en-US', {
+			timeZone: tzName,
+			year: 'numeric', month: '2-digit', day: '2-digit', weekday: 'long',
+			hour: '2-digit', minute: '2-digit', second: '2-digit',
+			hour12: false
+		}).formatToParts(date);
+		parts.forEach(p => {
+			partsMap[p.type] = p.value;
+		});
+
+		const monthValue = parseInt(partsMap.month) - 1;
+		const dayOfWeekValue = new Date(`${partsMap.year}-${partsMap.month}-${partsMap.day}`).getDay();
+		const hourValue = parseInt(partsMap.hour);
+
+		get = (fn: 'FullYear' | 'Month' | 'Date' | 'Day' | 'Hours' | 'Minutes' | 'Seconds' | 'Milliseconds'): number => {
+			switch (fn) {
+				case 'FullYear': return parseInt(partsMap.year);
+				case 'Month': return monthValue;
+				case 'Date': return parseInt(partsMap.day);
+				case 'Day': return dayOfWeekValue;
+				case 'Hours': return hourValue;
+				case 'Minutes': return parseInt(partsMap.minute);
+				case 'Seconds': return parseInt(partsMap.second);
+				default: return 0;
+			}
+		};
+	} else {
+		const offset = numericTz ? tz as number : 0;
+		zonedDate = new Date(date.getTime() + offset * 60 * 60 * 1000);
+		get = (fn: 'FullYear' | 'Month' | 'Date' | 'Day' | 'Hours' | 'Minutes' | 'Seconds' | 'Milliseconds'): number => zonedDate[`getUTC${fn}`]();
 	}
 
-	if(typeof date == 'number' || typeof date == 'string') date = new Date(date);
+	function numSuffix(n: number): string {
+		const s = ["th", "st", "nd", "rd"];
+		const v = n % 100;
+		return n + (s[(v - 20) % 10] || s[v] || s[0]);
+	}
 
-	// Handle timezones
-	let t!: [string, number];
-	if(tz == null) tz = -(date.getTimezoneOffset() / 60);
-	t = <any>timezones.find(t => isNaN(<any>tz) ? t[0] == tz : t[1] == tz);
-	if(!t) throw new Error(`Unknown timezone: ${tz}`);
-	date = adjustTz(date, t[1]);
+	function getTZOffset(): string {
+		if (numericTz) {
+			const total = (tz as number) * 60;
+			const hours = Math.floor(Math.abs(total) / 60);
+			const mins = Math.abs(total) % 60;
+			return `${tz >= 0 ? '+' : '-'}${String(hours).padStart(2, '0')}:${String(mins).padStart(2, '0')}`;
+		}
+		try {
+			const offset = new Intl.DateTimeFormat('en-US', {timeZone: tzName, timeZoneName: 'longOffset', hour: '2-digit', minute: '2-digit',})
+				.formatToParts(<Date>date).find(p => p.type === 'timeZoneName')?.value.match(/([+-]\d{2}:\d{2})/)?.[1];
+			if (offset) return offset;
+		} catch {}
+		return '+00:00';
+	}
+
+	function getTZAbbr(): string {
+		if (numericTz && tz === 0) return 'UTC';
+		try {
+			return new Intl.DateTimeFormat('en-US', { timeZone: tzName, timeZoneName: 'short' })
+				.formatToParts(<Date>date).find(p => p.type === 'timeZoneName')?.value || '';
+		} catch {
+			return tzName;
+		}
+	}
 
-	// Token mapping
 	const tokens: Record<string, string> = {
-		'YYYY': date.getFullYear().toString(),
-		'YY': date.getFullYear().toString().slice(2),
-		'MMMM': month(date.getMonth()),
-		'MMM': month(date.getMonth()).slice(0, 3),
-		'MM': (date.getMonth() + 1).toString().padStart(2, '0'),
-		'M': (date.getMonth() + 1).toString(),
-		'DDD': doy(date).toString(),
-		'DD': date.getDate().toString().padStart(2, '0'),
-		'Do': suffix(date.getDate()),
-		'D': date.getDate().toString(),
-		'dddd': day(date.getDay()),
-		'ddd': day(date.getDay()).slice(0, 3),
-		'HH': date.getHours().toString().padStart(2, '0'),
-		'H': date.getHours().toString(),
-		'hh': (date.getHours() % 12 || 12).toString().padStart(2, '0'),
-		'h': (date.getHours() % 12 || 12).toString(),
-		'mm': date.getMinutes().toString().padStart(2, '0'),
-		'm': date.getMinutes().toString(),
-		'ss': date.getSeconds().toString().padStart(2, '0'),
-		's': date.getSeconds().toString(),
-		'SSS': date.getMilliseconds().toString().padStart(3, '0'),
-		'A': date.getHours() >= 12 ? 'PM' : 'AM',
-		'a': date.getHours() >= 12 ? 'pm' : 'am',
-		'ZZ': tzOffset(t[1] * 60).replace(':', ''),
-		'Z': tzOffset(t[1] * 60),
-		'z': typeof tz == 'string' ? tz : (<any>t)[0]
+		YYYY: get('FullYear').toString(),
+		YY: get('FullYear').toString().slice(2),
+		MMMM: month(get('Month')),
+		MMM: month(get('Month')).slice(0, 3),
+		MM: (get('Month') + 1).toString().padStart(2, '0'),
+		M: (get('Month') + 1).toString(),
+		DDD: dayOfYear(zonedDate).toString(),
+		DD: get('Date').toString().padStart(2, '0'),
+		Do: numSuffix(get('Date')),
+		D: get('Date').toString(),
+		dddd: dayOfWeek(get('Day')),
+		ddd: dayOfWeek(get('Day')).slice(0, 3),
+		HH: get('Hours').toString().padStart(2, '0'),
+		H: get('Hours').toString(),
+		hh: (get('Hours') % 12 || 12).toString().padStart(2, '0'),
+		h: (get('Hours') % 12 || 12).toString(),
+		mm: get('Minutes').toString().padStart(2, '0'),
+		m: get('Minutes').toString(),
+		ss: get('Seconds').toString().padStart(2, '0'),
+		s: get('Seconds').toString(),
+		SSS: (zonedDate[`getUTC${'Milliseconds'}`]()).toString().padStart(3, '0'),
+		A: get('Hours') >= 12 ? 'PM' : 'AM',
+		a: get('Hours') >= 12 ? 'pm' : 'am',
+		ZZ: getTZOffset().replace(':', ''),
+		Z: getTZOffset(),
+		z: getTZAbbr(),
 	};
+
 	return format.replace(/YYYY|YY|MMMM|MMM|MM|M|DDD|DD|Do|D|dddd|ddd|HH|H|hh|h|mm|m|ss|s|SSS|A|a|ZZ|Z|z/g, token => tokens[token]);
 }
 
@@ -148,6 +207,10 @@ export function instantInterval(fn: () => any, interval: number) {
 	return setInterval(fn, interval);
 }
 
+export function month(m: number): string {
+	return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][m];
+}
+
 /**
  * Use in conjunction with `await` to pause an async script
  *
@@ -190,3 +253,35 @@ export async function sleepWhile(fn : () => boolean | Promise<boolean>, checkInt
 export function timeUntil(date: Date | number): number {
 	return (date instanceof Date ? date.getTime() : date) - (new Date()).getTime();
 }
+
+
+/**
+ * Convert a timezone string (e.g., "America/Toronto") to its current UTC offset in minutes.
+ * @param {string} tz - Timezone string, e.g. "America/Toronto"
+ * @param {Date} [date=new Date()] - The date for which you want the offset (default is now)
+ * @returns {number} - Offset in minutes (e.g., -240)
+ */
+export function timezoneOffset(tz: string, date: Date = new Date()): number {
+	const dtf = new Intl.DateTimeFormat('en-US', {
+		timeZone: tz,
+		hour12: false,
+		year: 'numeric',
+		month: '2-digit',
+		day: '2-digit',
+		hour: '2-digit',
+		minute: '2-digit',
+		second: '2-digit',
+	});
+	const parts = dtf.formatToParts(date);
+	const get = (type: string) => Number(parts.find(v => v.type === type)?.value);
+	const y = get('year');
+	const mo = get('month');
+	const d = get('day');
+	const h = get('hour');
+	const m = get('minute');
+	const s = get('second');
+
+	const asUTC = Date.UTC(y, mo - 1, d, h, m, s);
+	const asLocal = date.getTime();
+	return Math.round((asLocal - asUTC) / 60000);
+}

src/types.ts

@@ -1,20 +1,4 @@
-/**
- * Return keys on a type as an array of strings
- *
- * @example
- * ```ts
- * type Person = {
- * 	  firstName: string;
- * 	  lastName: string;
- * 	  age: number;
- * }
- *
- * const keys = typeKeys<Person>();
- * console.log(keys); // Output: ["firstName", "lastName", "age"]
- * ```
- *
- * @return {Array<keyof T>} Available keys
- */
-export function typeKeys<T extends object>() {
-	return Object.keys(<T>{}) as Array<keyof T>;
-}
+/** Mark all properties as writable */
+export type Writable<T> = {
+	-readonly [P in keyof T]: T[P]
+};

tests/arg-parser.spec.ts

@@ -0,0 +1,121 @@
+import { Arg, ArgParser } from '../src';
+
+describe('ArgParser', () => {
+	const basicArgs: Arg[] = [
+		{ name: 'input', desc: 'Input file' },
+		{ name: 'output', desc: 'Output file', default: 'out.txt' },
+		{ name: 'verbose', desc: 'Enable verbose mode', flags: ['-v', '--verbose'], default: false }
+	];
+
+	const commandArg = new ArgParser(
+		'subcmd',
+		'A sub command',
+		[{ name: 'foo', desc: 'Foo argument', optional: false }]
+	);
+
+	describe('constructor', () => {
+		it('should add commands and update examples', () => {
+			const parser = new ArgParser('main', 'desc', [commandArg, ...basicArgs], ['custom-example']);
+			expect(parser.commands[0].name).toBe('subcmd');
+			expect(parser.examples.some(e => typeof e === 'string' && e.includes('[OPTIONS] COMMAND'))).toBe(true);
+			expect(parser.examples).toEqual(expect.arrayContaining([
+				'custom-example',
+				expect.stringContaining('[OPTIONS]')
+			]));
+		});
+	});
+
+	describe('parse', () => {
+		it('should parse args and flags', () => {
+			const parser = new ArgParser('mycmd', 'desc', basicArgs);
+			const result = parser.parse(['file1.txt', '-v']);
+			expect(result.input).toBe('file1.txt');
+			expect(result.output).toBe('out.txt');
+			expect(result.verbose).toBe(true);
+			expect(result._extra).toEqual([]);
+		});
+
+		it('should handle missing required args and collect errors', () => {
+			const parser = new ArgParser('mycmd', 'desc', basicArgs);
+			const result = parser.parse([]);
+			expect(result._error).toContain('Argument missing: INPUT');
+		});
+
+		it('should handle default values correctly', () => {
+			const parser = new ArgParser('mycmd', 'desc', basicArgs);
+			const result = parser.parse(['file1.txt']);
+			expect(result.output).toBe('out.txt');
+			expect(result.verbose).toBe(false);
+		});
+
+		it('should parse flags with value assignment', () => {
+			const args: Arg[] = [
+				{ name: 'mode', desc: 'Mode', flags: ['-m', '--mode'], default: 'defaultMode' }
+			];
+			const parser = new ArgParser('mycmd', 'desc', args);
+			const result = parser.parse(['--mode=prod']);
+			expect(result.mode).toBe('prod');
+		});
+
+		it('should support extras collection', () => {
+			const args: Arg[] = [
+				{ name: 'main', desc: 'main', extras: true }
+			];
+			const parser = new ArgParser('cmd', 'desc', args);
+			const result = parser.parse(['a', 'b', 'c']);
+			expect(result.main).toEqual(['a', 'b', 'c']);
+		});
+
+		it('should handle unknown flags and put them to extras', () => {
+			const parser = new ArgParser('mycmd', 'desc', basicArgs);
+			const result = parser.parse(['file.txt', 'test', '--unknown']);
+			expect(result._extra).toContain('--unknown');
+		});
+
+		it('should handle subcommands and delegate parsing', () => {
+			const mainParser = new ArgParser('main', 'desc', [commandArg]);
+			const result = mainParser.parse(['subcmd', 'fooVal']);
+			expect(result._command).toBe('subcmd');
+			expect(result.foo).toBe('fooVal');
+		});
+
+		it('should parse combined short flags', () => {
+			const args: Arg[] = [
+				{ name: 'a', desc: 'Flag A', flags: ['-a'], default: false },
+				{ name: 'b', desc: 'Flag B', flags: ['-b'], default: false }
+			];
+			const parser = new ArgParser('mycmd', 'desc', args);
+			const result = parser.parse(['-ab']);
+			expect(result.a).toBe(true);
+			expect(result.b).toBe(true);
+		});
+	});
+
+	describe('help', () => {
+		it('should generate help with options and args', () => {
+			const parser = new ArgParser('mycmd', 'desc', basicArgs);
+			const helpMsg = parser.help();
+			expect(helpMsg).toContain('Input file');
+			expect(helpMsg).toContain('Enable verbose mode');
+			expect(helpMsg).toContain('-h, --help');
+		});
+
+		it('should generate help for a subcommand', () => {
+			const mainParser = new ArgParser('main', 'desc', [commandArg]);
+			const helpMsg = mainParser.help({ command: 'subcmd' });
+			expect(helpMsg).toContain('Foo argument');
+		});
+
+		it('should throw error for non-existent command', () => {
+			const mainParser = new ArgParser('main', 'desc', [commandArg]);
+			expect(() => mainParser.help({ command: 'notreal' })).toThrow();
+		});
+
+		it('should allow custom message override', () => {
+			const parser = new ArgParser('mycmd', 'desc', basicArgs);
+			const helpMsg = parser.help({ message: 'Custom!' });
+			expect(helpMsg).toContain('Custom!');
+			expect(helpMsg).not.toContain('desc');
+		});
+	});
+});

tests/array.spec.ts

@@ -1,82 +1,85 @@
-import {addUnique, caseInsensitiveSort, flattenArr, sortByProp} from '../src';
+import {addUnique, arrayDiff, caseInsensitiveSort, findByProp, flattenArr, makeArray, makeUnique, sortByProp,} from '../src';
 
 describe('Array Utilities', () => {
 	describe('addUnique', () => {
-		const arr = [1, 2];
-
-		test('non-unique', () => {
-			addUnique(arr, 1);
-			expect(arr).toStrictEqual([1, 2]);
+		it('does not add duplicate value', () => {
+			const arr = [1, 2, 3];
+			addUnique(arr, 2);
+			expect(arr).toEqual([1, 2, 3]);
 		});
-		test('unique', () => {
+		it('adds unique value', () => {
+			const arr = [1, 2];
 			addUnique(arr, 3);
-			expect(arr).toStrictEqual([1, 2, 3]);
+			expect(arr).toEqual([1, 2, 3]);
+		});
+	});
+
+	describe('arrayDiff', () => {
+		it('returns unique elements present only in one array', () => {
+			expect(arrayDiff([1, 2, 3], [3, 4, 5]).toSorted()).toEqual([1, 2, 4, 5]);
+		});
+		it('returns empty array if arrays have the same elements', () => {
+			expect(arrayDiff([1, 2], [1, 2])).toEqual([]);
+		});
+	});
+
+	describe('caseInseFsitiveSort', () => {
+		it('sorts objects by string property case-insensitively', () => {
+			const arr = [{n: 'b'}, {n: 'A'}, {n: 'c'}];
+			arr.sort(caseInsensitiveSort('n'));
+			expect(arr.map(i => i.n)).toEqual(['A', 'b', 'c']);
+		});
+	});
+
+	describe('findByProp', () => {
+		it('filters objects by property value', () => {
+			const arr = [{name: 'foo'}, {name: 'bar'}];
+			const found = arr.filter(findByProp('name', 'foo'));
+			expect(found).toEqual([{name: 'foo'}]);
 		});
 	});
 
 	describe('flattenArr', () => {
-		test('flat array', () => expect(flattenArr([1, 2])).toStrictEqual([1, 2]));
-		test('2D array', () => expect(flattenArr([[1, 2], [3, 4]])).toStrictEqual([1, 2, 3, 4]));
-		test('3D array', () => expect(flattenArr([[[1, 2], [3, 4]], [[5, 6], [7, 8]]])).toStrictEqual([1, 2, 3, 4, 5, 6, 7, 8]));
-		test('mixed array', () => expect(flattenArr([1, 2, [3, 4], [[5, 6], [7, 8]]])).toStrictEqual([1, 2, 3, 4, 5, 6, 7, 8]));
+		it('flattens deeply nested arrays', () => {
+			const arr = [1, [2, [3, [4]], 5], 6];
+			expect(flattenArr(arr)).toEqual([1, 2, 3, 4, 5, 6]);
+		});
+		it('flattens flat array as-is', () => {
+			expect(flattenArr([1, 2, 3])).toEqual([1, 2, 3]);
+		});
 	});
 
 	describe('sortByProp', () => {
-		test('random letters', () => {
-			let unsorted: any = Array(100).fill(null)
-				.map(() => String.fromCharCode(Math.round(Math.random() * 25) + 97));
-			const sorted = unsorted.sort((a: any, b: any) => {
-				if(a > b) return 1;
-				if(a < b) return -1;
-				return 0;
-			}).map((l: any) => ({a: l}));
-			unsorted = unsorted.map((l: any) => ({a: l}));
-			expect(unsorted.sort(sortByProp('a'))).toStrictEqual(sorted);
+		it('sorts by numeric property', () => {
+			const arr = [{a: 3}, {a: 1}, {a: 2}];
+			arr.sort(sortByProp('a'));
+			expect(arr.map(i => i.a)).toEqual([1, 2, 3]);
 		});
-		test('random letters reversed', () => {
-			let unsorted: any = Array(100).fill(null)
-				.map(() => String.fromCharCode(Math.round(Math.random() * 25) + 97));
-			const sorted = unsorted.sort((a: any, b: any) => {
-				if(a > b) return -1;
-				if(a < b) return 1;
-				return 0;
-			}).map((n: any) => ({a: n}));
-			unsorted = unsorted.map((n: any) => ({a: n}));
-			expect(unsorted.sort(sortByProp('a', true))).toStrictEqual(sorted);
-		});
-		test('random numbers', () => {
-			let unsorted: any = Array(100).fill(null).map(() => Math.round(Math.random() * 100));
-			const sorted = unsorted.sort((a: any, b: any) => a - b).map((n: any) => ({a: n}));
-			unsorted = unsorted.map((n: any) => ({a: n}));
-			expect(unsorted.sort(sortByProp('a'))).toStrictEqual(sorted);
-		});
-		test('random numbers reversed', () => {
-			let unsorted: any = Array(100).fill(null).map(() => Math.round(Math.random() * 100));
-			const sorted = unsorted.sort((a: any, b: any) => b - a).map((n: any) => ({a: n}));
-			unsorted = unsorted.map((n: any) => ({a: n}));
-			expect(unsorted.sort(sortByProp('a', true))).toStrictEqual(sorted);
+		it('sorts by string property reversed', () => {
+			const arr = [{a: 'apple'}, {a: 'banana'}, {a: 'pear'}];
+			arr.sort(sortByProp('a', true));
+			expect(arr.map(i => i.a)).toEqual(['pear', 'banana', 'apple']);
 		});
 	});
 
-	describe('caseInsensitiveSort', () => {
-		test('non-string property', () => {
-			const unsorted: any = [{a: 'Apple', b: 123}, {a: 'Carrot', b: 789}, {a: 'banana', b: 456}];
-			const sorted: any = unsorted.map((u: any) => ({...u}));
-			expect(unsorted.sort(caseInsensitiveSort('b'))).toStrictEqual(sorted);
+	describe('makeUnique', () => {
+		it('removes duplicate primitives', () => {
+			const arr = [1, 2, 2, 3, 1];
+			expect(makeUnique(arr)).toEqual([1, 2, 3]);
 		});
-		test('simple strings', () => {
-			const unsorted: any = [{a: 'Apple'}, {a: 'Carrot'}, {a: 'banana'}];
-			const sorted: any = unsorted.sort((first: any, second: any) => {
-				return first.a.toLowerCase().localeCompare(second.a.toLowerCase());
-			}).map((u: any) => ({...u}));
-			expect(unsorted.sort(caseInsensitiveSort('a'))).toStrictEqual(sorted);
+		it('removes duplicate objects', () => {
+			const obj = {a: 1};
+			const arr = [obj, obj, {a: 1}];
+			expect(makeUnique(arr)).toHaveLength(1);
 		});
-		test('alphanumeric strings', () => {
-			const unsorted: any = [{a: '4pple'}, {a: 'Carrot'}, {a: 'b4n4n4'}];
-			const sorted: any = unsorted.sort((first: any, second: any) => {
-				return first.a.toLowerCase().localeCompare(second.a.toLowerCase());
-			}).map((u: any) => ({...u}));
-			expect(unsorted.sort(caseInsensitiveSort('a'))).toStrictEqual(sorted);
+	});
+
+	describe('makeArray', () => {
+		it('wraps non-arrays in array', () => {
+			expect(makeArray(1)).toEqual([1]);
+		});
+		it('returns array as-is', () => {
+			expect(makeArray([1, 2])).toEqual([1, 2]);
 		});
 	});
 });

tests/aset.spec.ts

@@ -0,0 +1,148 @@
+import {ASet} from '../src';
+
+describe('ASet', () => {
+	describe('constructor', () => {
+		it('should create a set with unique elements', () => {
+			const set = new ASet([1, 2, 2, 3]);
+			expect(set.size).toBe(3);
+			expect(set.sort()).toEqual([1, 2, 3]);
+		});
+
+		it('should create an empty set by default', () => {
+			const set = new ASet();
+			expect(set.size).toBe(0);
+		});
+	});
+
+	describe('add', () => {
+		it('should add unique elements', () => {
+			const set = new ASet([1]);
+			set.add(2, 3, 1);
+			expect(set.sort()).toEqual([1, 2, 3]);
+		});
+
+		it('should return this', () => {
+			const set = new ASet();
+			expect(set.add(1)).toBe(set);
+		});
+	});
+
+	describe('clear', () => {
+		it('should remove all elements', () => {
+			const set = new ASet([1, 2]);
+			set.clear();
+			expect(set.size).toBe(0);
+		});
+
+		it('should return this', () => {
+			const set = new ASet([1]);
+			expect(set.clear()).toBe(set);
+		});
+	});
+
+	describe('delete', () => {
+		it('should remove specified elements', () => {
+			const set = new ASet([1, 2, 3]);
+			set.delete(2, 4);
+			expect(set.sort()).toEqual([1, 3]);
+		});
+
+		it('should return this', () => {
+			const set = new ASet([1]);
+			expect(set.delete(1)).toBe(set);
+		});
+	});
+
+	describe('difference', () => {
+		it('should return elements unique to this set', () => {
+			const setA = new ASet([1, 2, 3]);
+			const setB = new ASet([2, 4]);
+			expect(setA.difference(setB).sort()).toEqual([1, 3]);
+			expect(setB.difference(setA).sort()).toEqual([4]);
+		});
+	});
+
+	describe('has', () => {
+		it('should check if element exists in set', () => {
+			const set = new ASet([1, 2]);
+			expect(set.has(1)).toBe(true);
+			expect(set.has(99)).toBe(false);
+		});
+	});
+
+	describe('indexOf', () => {
+		it('should return correct index for primitive and object', () => {
+			const set = new ASet([{a: 1}, {b: 2}]);
+			expect(set.indexOf({a: 1})).toBe(0);
+			expect(set.indexOf(<any>{missing: 1})).toBe(-1);
+
+			const numbers = new ASet([1, 2, 3]);
+			expect(numbers.indexOf(2)).toBe(1);
+			expect(numbers.indexOf(10)).toBe(-1);
+		});
+	});
+
+	describe('intersection', () => {
+		it('should return elements common to both sets', () => {
+			const setA = new ASet([1, 2, 3]);
+			const setB = new ASet([2, 3, 4]);
+			expect(setA.intersection(setB).sort()).toEqual([2, 3]);
+		});
+	});
+
+	describe('isDisjointFrom', () => {
+		it('should check for no common elements', () => {
+			const setA = new ASet([1, 2]);
+			const setB = new ASet([3, 4]);
+			const setC = new ASet([2, 3]);
+			expect(setA.isDisjointFrom(setB)).toBe(true);
+			expect(setA.isDisjointFrom(setC)).toBe(false);
+		});
+	});
+
+	describe('isSubsetOf', () => {
+		it('should check if set is subset', () => {
+			const a = new ASet([1, 2]);
+			const b = new ASet([1, 2, 3]);
+			expect(a.isSubsetOf(b)).toBe(true);
+			expect(b.isSubsetOf(a)).toBe(false);
+		});
+	});
+
+	describe('isSuperset', () => {
+		it('should check if set is superset', () => {
+			const a = new ASet([1, 2, 3]);
+			const b = new ASet([1, 2]);
+			expect(a.isSuperset(b)).toBe(true);
+			expect(b.isSuperset(a)).toBe(false);
+		});
+	});
+
+	describe('symmetricDifference', () => {
+		it('should return elements only in one set (XOR)', () => {
+			const a = new ASet([1, 2, 3]);
+			const b = new ASet([3, 4]);
+			expect(a.symmetricDifference(b).sort()).toEqual([1, 2, 4]);
+		});
+	});
+
+	describe('union', () => {
+		it('should return union of two sets', () => {
+			const a = new ASet([1, 2]);
+			const b = new ASet([2, 3]);
+			expect(a.union(b).sort()).toEqual([1, 2, 3]);
+		});
+
+		it('should work with arrays', () => {
+			const a = new ASet([1]);
+			expect(a.union([2, 1, 3]).sort()).toEqual([1, 2, 3]);
+		});
+	});
+
+	describe('size', () => {
+		it('should return number of unique elements', () => {
+			const set = new ASet([1, 1, 2, 3, 3]);
+			expect(set.size).toBe(3);
+		});
+	});
+});

tests/cache.spec.ts

@@ -0,0 +1,194 @@
+import { Cache } from '../src';
+
+describe('Cache', () => {
+	type TestItem = { id: string; value: string };
+
+	let cache: Cache<string | symbol, TestItem>;
+	let storageMock: Storage;
+	let storageGetItemSpy: jest.SpyInstance;
+	let storageSetItemSpy: jest.SpyInstance;
+
+	beforeEach(() => {
+		jest.useFakeTimers();
+
+		storageMock = {
+			constructor: { name: 'Storage' as any },
+			getItem: jest.fn(),
+			setItem: jest.fn(),
+			removeItem: jest.fn(),
+			clear: jest.fn(),
+			key: jest.fn(),
+			length: 0,
+		};
+
+		// Spies
+		storageGetItemSpy = jest.spyOn(storageMock, 'getItem');
+		storageSetItemSpy = jest.spyOn(storageMock, 'setItem');
+
+		cache = new Cache<string | symbol, TestItem>('id', {
+			persistentStorage: { storage: storageMock, key: 'cache' },
+		});
+
+		jest.clearAllMocks();
+	});
+
+	afterEach(() => {
+		jest.useRealTimers();
+	});
+
+	it('adds and gets an item', () => {
+		const item = { id: '1', value: 'a' };
+		cache.add(item);
+		expect(cache.get('1')).toEqual(item);
+	});
+
+	it('skips expired items by default but fetches if requested', () => {
+		const item = { id: '2', value: 'b' };
+		cache.set('2', item);
+		cache.options.expiryPolicy = 'keep';
+		cache.expire('2');
+		expect(cache.get('2')).toBeNull();
+		expect(cache.get('2', true)).toEqual({ ...item, _expired: true });
+	});
+
+	it('supports property access and setting via Proxy', () => {
+		(cache as any)['3'] = { id: '3', value: 'c' };
+		expect((cache as any)['3']).toEqual({ id: '3', value: 'c' });
+		expect(cache.get('3')).toEqual({ id: '3', value: 'c' });
+	});
+
+	it('removes an item and persists', () => {
+		cache.add({ id: '4', value: 'd' });
+		cache.delete('4');
+		expect(cache.get('4')).toBeNull();
+		expect(storageSetItemSpy).toHaveBeenCalled();
+	});
+
+	it('clears the cache & cancels TTL timers', () => {
+		cache.set('1', { id: '1', value: 'x' }, 1);
+		cache.clear();
+		// Even after timers advance, nothing should appear or throw
+		jest.advanceTimersByTime(1500);
+		expect(cache.get('1', true)).toBeNull();
+		expect(cache.complete).toBe(false);
+	});
+
+	it('bulk adds, marks complete', () => {
+		const items = [
+			{ id: 'a', value: '1' },
+			{ id: 'b', value: '2' },
+		];
+		cache.addAll(items);
+		expect(cache.all().length).toBe(2);
+		expect(cache.complete).toBe(true);
+	});
+
+	it('returns correct keys, entries, map, and values()', () => {
+		cache.add({ id: 'x', value: 'foo' });
+		cache.add({ id: 'y', value: 'bar' });
+		expect(cache.keys().sort()).toEqual(['x', 'y']);
+		expect(cache.entries().map(e => e[0]).sort()).toEqual(['x', 'y']);
+		const m = cache.map();
+		expect(Object.keys(m)).toEqual(expect.arrayContaining(['x', 'y']));
+		expect(m['x'].value).toBe('foo');
+		// CHANGE: values() was a snapshot field before; now it’s a method
+		expect(cache.values().map(v => v.id).sort()).toEqual(['x', 'y']);
+	});
+
+	it('persists and restores from storage', () => {
+		(storageMock.getItem as jest.Mock).mockReturnValueOnce(
+			JSON.stringify({ z: { id: 'z', value: 'from-storage' } }),
+		);
+		const c = new Cache<string, TestItem>('id', {
+			persistentStorage: { storage: storageMock, key: 'cache' },
+		});
+		expect(c.get('z')).toEqual({ id: 'z', value: 'from-storage' });
+		// ensure it used the right storage key
+		expect(storageGetItemSpy).toHaveBeenCalledWith('cache');
+	});
+
+	it('expiryPolicy "delete" removes expired items completely', () => {
+		cache.options.expiryPolicy = 'delete';
+		cache.add({ id: 'del1', value: 'gone' });
+		cache.expire('del1');
+		expect(cache.get('del1', true)).toBeNull();
+		expect(cache.get('del1')).toBeNull();
+	});
+
+	it('expiryPolicy "keep" marks as expired but does not delete', () => {
+		cache.options.expiryPolicy = 'keep';
+		cache.add({ id: 'keep1', value: 'kept' });
+		cache.expire('keep1');
+		expect(cache.get('keep1')).toBeNull();
+		const val = cache.get('keep1', true);
+		expect(val && val._expired).toBe(true);
+	});
+
+	it('TTL expiration deletes by default', () => {
+		cache.add({ id: 'ttl1', value: 'tick' }, 1);
+		jest.advanceTimersByTime(999);
+		expect(cache.get('ttl1')).toEqual({ id: 'ttl1', value: 'tick' });
+		jest.advanceTimersByTime(2);
+		expect(cache.get('ttl1')).toBeNull();
+	});
+
+	it('TTL overwrite cancels previous timer', () => {
+		cache.add({ id: 'ow', value: 'v1' }, 1);
+		jest.advanceTimersByTime(500);
+		cache.add({ id: 'ow', value: 'v2' }, 1);
+		jest.advanceTimersByTime(600);
+		expect(cache.get('ow')).toEqual({ id: 'ow', value: 'v2' });
+		jest.advanceTimersByTime(500);
+		expect(cache.get('ow')).toBeNull();
+	});
+
+	it('find() returns first match respecting expired flag', () => {
+		cache.options.expiryPolicy = 'keep';
+		cache.add({ id: 'f1', value: 'hello' });
+		cache.add({ id: 'f2', value: 'world' });
+		cache.expire('f1');
+		expect(cache.find({ value: 'hello' })).toBeUndefined();
+		expect(cache.find({ value: 'hello' }, true)).toEqual({ id: 'f1', value: 'hello', _expired: true });
+	});
+
+	it('symbol keys are supported when using set/get directly', () => {
+		const s = Symbol('k');
+		// NOTE: can’t use add() without a primary key; set works fine
+		cache.set(s, { id: 'sym', value: 'ok' });
+		expect(cache.get(s as any)).toEqual({ id: 'sym', value: 'ok' });
+		// ensure keys() includes the symbol
+		const keys = cache.keys(true);
+		expect(keys.includes(s as any)).toBe(true);
+	});
+
+	it('LRU: evicts least-recently-used when over capacity', () => {
+		const lruCache = new Cache<string, TestItem>('id', {
+			sizeLimit: 2,
+			persistentStorage: { storage: storageMock, key: 'cache' },
+		});
+
+		lruCache.add({ id: 'A', value: '1' });
+		lruCache.add({ id: 'B', value: '2' });
+		// touch A to make it MRU
+		expect(lruCache.get('A')).toEqual({ id: 'A', value: '1' });
+		// add C → should evict least-recently-used (B)
+		lruCache.add({ id: 'C', value: '3' });
+
+		expect(lruCache.get('B')).toBeNull();
+		expect(lruCache.get('A')).toEqual({ id: 'A', value: '1' });
+		expect(lruCache.get('C')).toEqual({ id: 'C', value: '3' });
+	});
+
+	it('delete() removes from LRU and cancels timer', () => {
+		const lruCache = new Cache<string, TestItem>('id', { sizeLimit: 2 });
+		lruCache.set('A', { id: 'A', value: '1' }, 1);
+		lruCache.delete('A');
+		jest.advanceTimersByTime(1200);
+		expect(lruCache.get('A', true)).toBeNull();
+	});
+
+	it('throws when adding item missing the primary key', () => {
+		const c = new Cache<'id', any>('id');
+		expect(() => c.add({ nope: 'missing' } as any)).toThrow(/Doesn't exist/);
+	});
+});

tests/color.spec.ts

@@ -0,0 +1,40 @@
+import {contrast} from '../src';
+
+describe('contrast', () => {
+	it('should return "black" for white background', () => {
+		expect(contrast('ffffff')).toBe('black');
+		expect(contrast('#ffffff'.replace('#', ''))).toBe('black'); // simulate trimmed hash
+	});
+
+	it('should return "white" for black background', () => {
+		expect(contrast('000000')).toBe('white');
+	});
+
+	it('should return "white" for a dark color', () => {
+		expect(contrast('123456')).toBe('white');
+		expect(contrast('222222')).toBe('white');
+	});
+
+	it('should return "black" for a light color', () => {
+		expect(contrast('ffff99')).toBe('black');
+		expect(contrast('cccccc')).toBe('black');
+	});
+
+	it('should handle short hex color codes (3 chars)', () => {
+		expect(contrast('fff')).toBe('black');
+		expect(contrast('000')).toBe('white');
+	});
+
+	it('should return "black" for invalid input', () => {
+		expect(contrast('')).toBe('black');
+		expect(contrast('zzzzzz')).toBe('black');
+		expect(contrast('not-a-color')).toBe('black');
+		expect(contrast(undefined as unknown as string)).toBe('black');
+		expect(contrast(null as unknown as string)).toBe('black');
+	});
+
+	it('should handle hex codes with hash prefix if removed', () => {
+		expect(contrast('ededed')).toBe('black');
+		expect(contrast('343434')).toBe('white');
+	});
+});

tests/csv.spec.ts

@@ -0,0 +1,90 @@
+import {fromCsv, toCsv} from '../src';
+
+describe('CSV Utilities', () => {
+	describe('fromCsv', () => {
+		it('parses CSV with headers', () => {
+			const input = `name,age,city
+John,30,New York
+Jane,25,Los Angeles`;
+			const expected = [
+				{name: 'John', age: '30', city: 'New York'},
+				{name: 'Jane', age: '25', city: 'Los Angeles'},
+			];
+			expect(fromCsv(input)).toEqual(expected);
+		});
+
+		it('parses CSV without headers', () => {
+			const input = `apple,red,1
+banana,yellow,2`;
+			const expected = [
+				{A: 'apple', B: 'red', C: '1'},
+				{A: 'banana', B: 'yellow', C: '2'},
+			];
+			expect(fromCsv(input, false)).toEqual(expected);
+		});
+
+		it('handles quoted fields and commas', () => {
+			const input = `name,description
+"Widget, Large","A large, useful widget"
+Gadget,"A ""versatile"" gadget"`;
+			const expected = [
+				{name: 'Widget, Large', description: 'A large, useful widget'},
+				{name: 'Gadget', description: 'A "versatile" gadget'},
+			];
+			expect(fromCsv(input)).toEqual(expected);
+		});
+
+		it('handles empty fields', () => {
+			const input = `id,name,score
+1,Tom,97
+2,,89
+3,Alice,`;
+			const expected = [
+				{id: '1', name: 'Tom', score: '97'},
+				{id: '2', name: '', score: '89'},
+				{id: '3', name: 'Alice', score: ''},
+			];
+			expect(fromCsv(input)).toEqual(expected);
+		});
+	});
+
+	describe('toCsv', () => {
+		it('converts array of objects to CSV', () => {
+			const arr = [
+				{name: 'John', age: 30, city: 'New York'},
+				{name: 'Jane', age: 25, city: 'Los Angeles'},
+			];
+			const csv = toCsv(arr);
+			expect(csv).toContain('name,age,city');
+			expect(csv).toContain('John,30,New York');
+			expect(csv).toContain('Jane,25,Los Angeles');
+		});
+
+		it('quotes fields with commas and quotes', () => {
+			const arr = [
+				{val: 'Comma, included', remark: 'needs, quotes'},
+				{val: 'Quote "double"', remark: 'embedded "quotes"'},
+			];
+			const csv = toCsv(arr);
+			expect(csv).toContain('"Comma, included","needs, quotes"');
+			expect(csv).toContain('"Quote ""double""","embedded ""quotes"""');
+		});
+
+		it('handles nested objects when flatten = true', () => {
+			const arr = [
+				{id: 1, info: {name: 'Alice', age: 20}},
+				{id: 2, info: {name: 'Bob', age: 22}}
+			];
+			const csv = toCsv(arr, true);
+			expect(csv).toMatch(/id,info\.name,info\.age/);
+			expect(csv).toMatch(/1,Alice,20/);
+			expect(csv).toMatch(/2,Bob,22/);
+		});
+
+		it('handles objects with array fields', () => {
+			const arr = [{name: 'Joe', tags: ['a', 'b']}];
+			const csv = toCsv(arr);
+			expect(csv).toContain('Joe,"[""a"",""b""]"');
+		});
+	});
+});

tests/emitter.spec.ts

@@ -0,0 +1,118 @@
+import {TypedEmitter} from '../src';
+
+describe('TypedEmitter', () => {
+	describe('Instance', () => {
+		type Events = {
+			foo: (data: string) => void;
+			bar: (x: number, y: number) => void;
+			'*': (event: string, ...args: any[]) => void;
+		};
+		let emitter: TypedEmitter<Events>;
+
+		beforeEach(() => {
+			emitter = new TypedEmitter<Events>();
+		});
+
+		it('calls the correct listener on emit', () => {
+			const fooHandler = jest.fn();
+			emitter.on('foo', fooHandler);
+
+			emitter.emit('foo', 'hello');
+			expect(fooHandler).toHaveBeenCalledWith('hello');
+		});
+
+		it('does NOT call listener after off', () => {
+			const fooHandler = jest.fn();
+			emitter.on('foo', fooHandler);
+			emitter.off('foo', fooHandler);
+			emitter.emit('foo', 'test');
+			expect(fooHandler).not.toHaveBeenCalled();
+		});
+
+		it('returns unsubscribe function that removes handler', () => {
+			const handler = jest.fn();
+			const unsubscribe = emitter.on('foo', handler);
+			unsubscribe();
+			emitter.emit('foo', 'x');
+			expect(handler).not.toHaveBeenCalled();
+		});
+
+		it('calls wildcard listener for all events', () => {
+			const wildcard = jest.fn();
+			emitter.on('*', wildcard);
+
+			emitter.emit('foo', 'data');
+			emitter.emit('bar', 1, 2);
+
+			expect(wildcard).toHaveBeenCalledWith('foo', 'data');
+			expect(wildcard).toHaveBeenCalledWith('bar', 1, 2);
+		});
+
+		it('once() resolves with argument and auto-unsubscribes', async () => {
+			const p = emitter.once('foo');
+			emitter.emit('foo', 'only-once');
+			expect(await p).toBe('only-once');
+
+			// no more handlers
+			const cb = jest.fn();
+			emitter.on('foo', cb);
+			emitter.emit('foo', 'again');
+			expect(cb).toHaveBeenCalledWith('again');
+		});
+
+		it('once() calls optional listener and Promise resolves', async () => {
+			const listener = jest.fn();
+			const oncePromise = emitter.once('bar', listener);
+
+			emitter.emit('bar', 1, 2);
+
+			expect(listener).toHaveBeenCalledWith(1, 2);
+			expect(await oncePromise).toEqual([1, 2]);
+		});
+	});
+
+	describe('Static', () => {
+		beforeEach(() => {
+			// Clear static listeners between tests
+			(TypedEmitter as any).listeners = {};
+		});
+
+		it('calls static listeners with emit', () => {
+			const spy = jest.fn();
+			TypedEmitter.on('event', spy);
+
+			TypedEmitter.emit('event', 1, 'a');
+			expect(spy).toHaveBeenCalledWith(1, 'a');
+		});
+
+		it('wildcard static listeners receive all event types', () => {
+			const spy = jest.fn();
+			TypedEmitter.on('*', spy);
+
+			TypedEmitter.emit('xy', 123);
+			expect(spy).toHaveBeenCalledWith('xy', 123);
+		});
+
+		it('only calls listener once with once()', async () => {
+			const handler = jest.fn();
+			const p = TypedEmitter.once('ping', handler);
+
+			TypedEmitter.emit('ping', 'pong');
+
+			expect(handler).toHaveBeenCalledWith('pong');
+			await expect(p).resolves.toBe('pong');
+
+			handler.mockClear();
+			TypedEmitter.emit('ping', 'other');
+			expect(handler).not.toHaveBeenCalled();
+		});
+
+		it('removes static listener with off', () => {
+			const h = jest.fn();
+			TypedEmitter.on('offevent', h);
+			TypedEmitter.off('offevent', h);
+			TypedEmitter.emit('offevent', 42);
+			expect(h).not.toHaveBeenCalled();
+		});
+	});
+});

tests/errors.spec.ts

@@ -0,0 +1,112 @@
+import {
+	CustomError,
+	BadRequestError,
+	UnauthorizedError,
+	PaymentRequiredError,
+	ForbiddenError,
+	NotFoundError,
+	MethodNotAllowedError,
+	NotAcceptableError,
+	InternalServerError,
+	NotImplementedError,
+	BadGatewayError,
+	ServiceUnavailableError,
+	GatewayTimeoutError,
+	errorFromCode
+} from '../src';
+
+describe('CustomError Hierarchy', () => {
+	it('CustomError basic properties and code getter/setter', () => {
+		const err = new CustomError('Test', 501);
+		expect(err.message).toBe('Test');
+		expect(err.code).toBe(501);
+		err.code = 404;
+		expect(err.code).toBe(404);
+		// default code if not provided
+		const noCodeError = new CustomError('No code');
+		expect(noCodeError.code).toBe(500);
+	});
+
+	it('CustomError static from method copies properties and stack', () => {
+		const orig: any = new Error('oops');
+		orig.code = 402;
+		orig.stack = 'FAKE_STACK';
+		const custom = CustomError.from(orig);
+		expect(custom).toBeInstanceOf(CustomError);
+		expect(custom.message).toBe('oops');
+		expect(custom.code).toBe(500);
+		expect(custom.stack).toBe('FAKE_STACK');
+	});
+
+	it('CustomError instanceof works', () => {
+		expect(CustomError.instanceof(new CustomError())).toBe(true);
+		expect(CustomError.instanceof(new Error())).toBe(false);
+	});
+
+	it('CustomError toString returns message', () => {
+		const err = new CustomError('foo');
+		expect(err.toString()).toBe('foo');
+	});
+
+	const cases = [
+		[BadRequestError, 400, 'Bad Request'],
+		[UnauthorizedError, 401, 'Unauthorized'],
+		[PaymentRequiredError, 402, 'Payment Required'],
+		[ForbiddenError, 403, 'Forbidden'],
+		[NotFoundError, 404, 'Not Found'],
+		[MethodNotAllowedError, 405, 'Method Not Allowed'],
+		[NotAcceptableError, 406, 'Not Acceptable'],
+		[InternalServerError, 500, 'Internal Server Error'],
+		[NotImplementedError, 501, 'Not Implemented'],
+		[BadGatewayError, 502, 'Bad Gateway'],
+		[ServiceUnavailableError, 503, 'Service Unavailable'],
+		[GatewayTimeoutError, 504, 'Gateway Timeout'],
+	] as const;
+
+	describe.each(cases)(
+		'%p (code=%i, defaultMessage="%s")',
+		(ErrClass, code, defMsg) => {
+			it('has static code, default message, and instanceof', () => {
+				const e = new ErrClass();
+				expect(e).toBeInstanceOf(ErrClass);
+				expect(e.code).toBe(code);
+				expect(e.message).toBe(defMsg);
+				expect(ErrClass.instanceof(e)).toBe(true);
+			});
+
+			it('supports custom messages', () => {
+				const msg = 'Custom msg';
+				const e = new ErrClass(msg);
+				expect(e.message).toBe(msg);
+			});
+		}
+	);
+
+	describe('errorFromCode', () => {
+		it.each(cases)(
+			'returns %p for code %i',
+			(ErrClass, code, defMsg) => {
+				const err = errorFromCode(code);
+				expect(err).toBeInstanceOf(ErrClass);
+				expect(err.code).toBe(code);
+				expect(err.message).toBe(defMsg);
+			}
+		);
+		it('overrides message if provided', () => {
+			const err = errorFromCode(404, 'Nope');
+			expect(err).toBeInstanceOf(NotFoundError);
+			expect(err.message).toBe('Nope');
+		});
+		it('fallbacks to CustomError for unknown codes', () => {
+			const err = errorFromCode(999, 'xyz');
+			expect(err).toBeInstanceOf(CustomError);
+			expect(err.code).toBe(999);
+			expect(err.message).toBe('xyz');
+		});
+		it('handles missing message gracefully', () => {
+			const err = errorFromCode(555);
+			expect(err).toBeInstanceOf(CustomError);
+			expect(err.code).toBe(555);
+		});
+	});
+});

tests/json.spec.ts

@@ -0,0 +1,33 @@
+import {JSONAttemptParse, JSONSanitize, JSONSerialize} from '../src';
+
+describe('JSON Utilities', () => {
+	describe('JSONAttemptParse', () => {
+		it('parses valid JSON', () => {
+			expect(JSONAttemptParse('{"a":1}')).toEqual({ a: 1 });
+		});
+		it('returns original string on error', () => {
+			expect(JSONAttemptParse('not json')).toBe('not json');
+		});
+	});
+
+	describe('JSONSerialize', () => {
+		it('serializes objects', () => {
+			expect(JSONSerialize({ a: 1 })).toBe(JSON.stringify({ a: 1 }));
+		});
+		it('leaves primitives as is', () => {
+			expect(JSONSerialize('test')).toBe('test');
+			expect(JSONSerialize(123)).toBe(123);
+		});
+	});
+
+	describe('JSONSanitize', () => {
+		it('stringifies objects', () => {
+			expect(JSONSanitize({ a: 1 })).toBe(JSON.stringify({ a: 1 }));
+		});
+		it('does not throw on circular refs', () => {
+			const obj: any = {};
+			obj.self = obj;
+			expect(() => JSONSanitize(obj)).not.toThrow();
+		});
+	});
+});

tests/jwt.spec.ts

@@ -0,0 +1,61 @@
+import { createJwt, decodeJwt } from '../src';
+
+describe('JWT Utilities', () => {
+	describe('createJwt', () => {
+		it('should create a valid JWT string with default signature', () => {
+			const payload = { foo: 'bar', num: 123 };
+			const jwt = createJwt(payload);
+			const parts = jwt.split('.');
+			expect(parts).toHaveLength(3);
+
+			// Header should decode to HS256 + JWT
+			const header = JSON.parse(Buffer.from(parts[0], 'base64url').toString());
+			expect(header).toEqual({ alg: "HS256", typ: "JWT" });
+
+			// Body should match the payload
+			const body = JSON.parse(Buffer.from(parts[1], 'base64url').toString());
+			expect(body).toEqual(payload);
+
+			// Signature should be 'unsigned'
+			expect(parts[2]).toBe('unsigned');
+		});
+
+		it('should allow custom signature', () => {
+			const jwt = createJwt({ test: 1 }, 'mysignature');
+			expect(jwt.split('.')[2]).toBe('mysignature');
+		});
+	});
+
+	describe('decodeJwt', () => {
+		it('should decode a JWT payload', () => {
+			const payload = { user: 'alice', age: 30 };
+			const jwt = createJwt(payload);
+			const decoded = decodeJwt<typeof payload>(jwt);
+			expect(decoded).toEqual(payload);
+		});
+
+		it('should decode payload with different types', () => {
+			const payload = { arr: [1,2,3], flag: true, val: null };
+			const jwt = createJwt(payload);
+			const decoded = decodeJwt<typeof payload>(jwt);
+			expect(decoded).toEqual(payload);
+		});
+
+		it('should throw or return null for malformed tokens', () => {
+			// Not enough parts
+			expect(() => decodeJwt('foo.bar')).toThrow();
+			// Bad base64
+			expect(() => decodeJwt('a.b@d.c')).toThrow();
+		});
+
+		it('should decode JWT even if signature is missing', () => {
+			// Two-part JWT (not standard, but let's see what happens)
+			const payload = { ok: true };
+			const header = Buffer.from(JSON.stringify({ alg: "HS256", typ: "JWT" })).toString('base64url');
+			const body = Buffer.from(JSON.stringify(payload)).toString('base64url');
+			const jwt = `${header}.${body}`;
+			const decoded = decodeJwt<typeof payload>(jwt + '.');
+			expect(decoded).toEqual(payload);
+		});
+	});
+});

tests/math.spec.ts

@@ -0,0 +1,51 @@
+import { dec2Frac, fracToDec } from '../src';
+
+describe('Math Utilities', () => {
+	describe('dec2Frac', () => {
+		it('should convert decimal to fraction with whole and remainder', () => {
+			expect(dec2Frac(1.25)).toBe('1 1/4');
+			expect(dec2Frac(2.5)).toBe('2 1/2');
+			expect(dec2Frac(3.75)).toBe('3 3/4');
+		});
+
+		it('should convert integer to fraction with denominator', () => {
+			expect(dec2Frac(4)).toBe('4');
+			expect(dec2Frac(0)).toBe('0');
+		});
+
+		it('should convert proper fraction (less than 1)', () => {
+			expect(dec2Frac(0.75)).toBe('3/4');
+			expect(dec2Frac(0.5)).toBe('1/2');
+			expect(dec2Frac(0.1)).toBe('1/10');
+		});
+
+		it('should handle repeating decimals gracefully', () => {
+			expect(dec2Frac(0.333333)).toBe('1/3');
+			expect(dec2Frac(0.666666)).toBe('2/3');
+		});
+	});
+
+	describe('fracToDec', () => {
+		it('should convert mixed fraction to decimal', () => {
+			expect(fracToDec('1 1/4')).toBeCloseTo(1.25);
+			expect(fracToDec('2 1/2')).toBeCloseTo(2.5);
+			expect(fracToDec('3 3/4')).toBeCloseTo(3.75);
+		});
+
+		it('should convert fraction without whole part to decimal', () => {
+			expect(fracToDec('3/4')).toBeCloseTo(0.75);
+			expect(fracToDec('1/2')).toBeCloseTo(0.5);
+			expect(fracToDec('1/10')).toBeCloseTo(0.1);
+		});
+
+		it('should convert whole number fraction', () => {
+			expect(fracToDec('4 0/1')).toBeCloseTo(4);
+			expect(fracToDec('0/1')).toBeCloseTo(0);
+		});
+
+		it('should handle zero correctly', () => {
+			expect(fracToDec('0/1')).toBeCloseTo(0);
+			expect(fracToDec('0 0/1')).toBeCloseTo(0);
+		});
+	});
+});

tests/misc.spec.ts

@@ -1,36 +1,44 @@
-import {sleep, parseUrl} from '../src';
+import {fn, gravatar, escapeRegex, md5} from '../src';
 
-describe('Miscellanies Utilities', () => {
-	describe('sleep', () => {
-		test('wait until', async () => {
-			const wait = ~~(Math.random() * 500);
-			const time = new Date().getTime();
-			await sleep(wait);
-			expect(new Date().getTime()).toBeGreaterThanOrEqual(time + wait);
+describe('Misc Utilities', () => {
+	describe('fn', () => {
+		it('should execute a stringified function with arguments', () => {
+			const result = fn({ x: 2, y: 3 }, 'return x + y;');
+			expect(result).toBe(5);
+		});
+
+		it('should execute an async function if async=true', async () => {
+			const asyncFn = 'return await Promise.resolve(x * y);';
+			const result = await fn({ x: 3, y: 4 }, asyncFn, true);
+			expect(result).toBe(12);
+		});
+
+		it('should work with no arguments', () => {
+			const result = fn({}, 'return 42;');
+			expect(result).toBe(42);
 		});
 	});
 
-	describe('urlParser', () => {
-		test('localhost w/ port', () => {
-			const parsed = parseUrl('http://localhost:4200/some/path?q1=test1&q2=test2#frag');
-			expect(parsed.protocol).toStrictEqual('http');
-			expect(parsed.host).toStrictEqual('localhost:4200');
-			expect(parsed.domain).toStrictEqual('localhost');
-			expect(parsed.port).toStrictEqual(4200);
-			expect(parsed.path).toStrictEqual('/some/path');
-			expect(parsed.query).toStrictEqual({q1: 'test1', q2: 'test2'});
-			expect(parsed.fragment).toStrictEqual('frag');
+	describe('gravatar', () => {
+		it('should return empty string if email is falsy', () => {
+			expect(gravatar('')).toBe('');
 		});
+		it('should build correct gravatar url', () => {
+			const email = 'test@example.com';
+			expect(gravatar(email)).toContain(`https://www.gravatar.com/avatar/${md5(email)}`);
+		});
+	});
 
-		test('advanced URL', () => {
-			const parsed = parseUrl('https://sub.domain.example.com/some/path?q1=test1&q2=test2#frag');
-			expect(parsed.protocol).toStrictEqual('https');
-			expect(parsed.host).toStrictEqual('sub.domain.example.com');
-			expect(parsed.domain).toStrictEqual('example.com');
-			expect(parsed.subdomain).toStrictEqual('sub.domain');
-			expect(parsed.path).toStrictEqual('/some/path');
-			expect(parsed.query).toStrictEqual({q1: 'test1', q2: 'test2'});
-			expect(parsed.fragment).toStrictEqual('frag');
+	describe('escapeRegex', () => {
+		it('should escape all special regex characters', () => {
+			const special = '.*+?^${}()|[]\\';
+			const escaped = escapeRegex(special);
+			expect(escaped).toBe('\\.\\*\\+\\?\\^\\$\\{\\}\\(\\)\\|\\[\\]\\\\');
+		});
+		it('should return original string if nothing to escape', () => {
+			const normal = 'abc123';
+			const escaped = escapeRegex(normal);
+			expect(escaped).toBe('abc123');
 		});
 	});
 });

tests/object.spec.ts

@@ -1,89 +1,133 @@
-import {clean, deepCopy, dotNotation, flattenObj, includes, isEqual} from "../src";
-
-describe('Object Utilities', () => {
-	const TEST_OBJECT = {
-		a: 1,
-		b: [
-			[2, 3],
-			[4, 5]
-		],
-		c: {
-			d: [
-				[{e: 6, f: 7}]
-			],
-		},
-		g: {h: 8},
-		i: () => 9
-	};
+import {
+	clean, deepCopy, deepMerge, dotNotation, encodeQuery, flattenObj, formData, includes, isEqual, mixin,
+} from '../src';
 
+describe('Object utilities', () => {
 	describe('clean', () => {
-		test('remove null properties', () => {
-			const a = {a: 1, b: null, c: undefined};
-			const final = {a: 1};
-			expect(clean(a)).toEqual(final);
+		it('removes null values', () => {
+			const obj = { a: 1, b: null, c: undefined, d: 0 };
+			expect(clean({ ...obj })).toEqual({ a: 1, c: undefined, d: 0 });
 		});
-		test('remove undefined properties', () => {
-			const a = {a: 1, b: null, c: undefined};
-			const final = {a: 1, b: null};
-			expect(clean(a, true)).toEqual(final);
+		it('throws on null input', () => {
+			expect(() => clean(null as any)).toThrow();
+		});
+		it('removes undefined only when specified', () => {
+			const obj = { a: 1, b: undefined, c: null };
+			expect(clean({ ...obj }, true)).toEqual({ a: 1, c: null });
+		});
+		it('works for arrays', () => {
+			expect(clean([1, null, 2, undefined, 3] as any)).toEqual([1, 2, 3]);
+		});
+	});
+
+	describe('deepCopy', () => {
+		it('creates a deep copy', () => {
+			const obj = { a: { b: 2 } };
+			const copy = deepCopy(obj);
+			expect(copy).toEqual(obj);
+			expect(copy).not.toBe(obj);
+			expect(copy.a).not.toBe(obj.a);
+		});
+	});
+
+	describe('deepMerge', () => {
+		it('merges deeply nested objects', () => {
+			const tgt = { a: { b: 1 }, d: 7 };
+			const src = { a: { c: 2 }, d: 8 };
+			expect(deepMerge({ ...tgt }, src)).toEqual({ a: { b: 1, c: 2 }, d: 8 });
+		});
+		it('merges multiple sources', () => {
+			const t = { a: 1 };
+			const s1 = { b: 2 };
+			const s2 = { c: 3 };
+			expect(deepMerge({ ...t }, s1, s2)).toEqual({ a: 1, b: 2, c: 3 });
 		});
 	});
 
 	describe('dotNotation', () => {
-		test('no object or properties', () => {
-			expect(dotNotation(undefined, 'z')).toStrictEqual(undefined);
-			expect(dotNotation(TEST_OBJECT, '')).toStrictEqual(undefined);
+		it('gets nested value', () => {
+			const obj = { a: { b: { c: 3 } } };
+			expect(dotNotation(obj, 'a.b.c')).toBe(3);
 		});
-		test('invalid property', () => expect(dotNotation(TEST_OBJECT, 'z')).toBeUndefined());
-		test('by property', () => expect(dotNotation(TEST_OBJECT, 'a')).toBe(TEST_OBJECT.a));
-		test('by key', () => expect(dotNotation(TEST_OBJECT, '["a"]')).toBe(TEST_OBJECT['a']));
-		test('by key (single quote)', () => expect(dotNotation(TEST_OBJECT, '[\'a\']')).toBe(TEST_OBJECT['a']));
-		test('by key (double quote)', () => expect(dotNotation(TEST_OBJECT, '["a"]')).toBe(TEST_OBJECT['a']));
-		test('by index', () => expect(dotNotation(TEST_OBJECT, 'b[0]')).toBe(TEST_OBJECT.b[0]));
-		test('by index (2d)', () => expect(dotNotation(TEST_OBJECT, 'b[1][1]')).toBe(TEST_OBJECT.b[1][1]));
-		test('everything combined', () => expect(dotNotation(TEST_OBJECT, 'c["d"][0][0].e'))
-			.toBe(TEST_OBJECT.c['d'][0][0].e));
-		test('set value', () => {
-			const COPY = JSON.parse(JSON.stringify(TEST_OBJECT));
-			dotNotation(COPY, 'c["d"][0][0].e', 'test');
-			expect(COPY['c']['d'][0][0]['e']).toBe('test');
+		it('sets nested value', () => {
+			const obj = { a: { b: { c: 3 } } };
+			dotNotation(obj, 'a.b.c', 10);
+			expect(obj.a.b.c).toBe(10);
 		});
-		test('set new value', () => {
-			const COPY = JSON.parse(JSON.stringify(TEST_OBJECT));
-			dotNotation(COPY, 'c.x.y.z', 'test');
-			expect(COPY['c']['x']['y']['z']).toBe('test');
+		it('returns undefined for non-existent path', () => {
+			expect(dotNotation({ a: 1 }, 'a.b.c')).toBeUndefined();
+		});
+		it('creates nested object when setting', () => {
+			const obj: any = {};
+			dotNotation(obj, 'd.e.f', 5);
+			expect(obj.d.e.f).toBe(5);
+		});
+	});
+
+	describe('encodeQuery', () => {
+		it('encodes simple objects', () => {
+			expect(encodeQuery({ a: 1, b: 'test' })).toBe('a=1&b=test');
+		});
+		it('handles special characters', () => {
+			expect(encodeQuery({ a: 'hello world' })).toBe('a=hello%20world');
+		});
+	});
+
+	describe('flattenObj', () => {
+		it('flattens nested objects', () => {
+			const obj = { a: { b: 2 }, c: 3 };
+			expect(flattenObj(obj)).toEqual({ 'a.b': 2, c: 3 });
+		});
+		it('handles multiple nesting', () => {
+			const obj = { a: { b: { c: 4 } } };
+			expect(flattenObj(obj)).toEqual({ 'a.b.c': 4 });
+		});
+	});
+
+	describe('formData', () => {
+		it('converts object to FormData', () => {
+			const obj = { a: '1', b: 'foo' };
+			const fd = formData(obj);
+			expect(fd.get('a')).toBe('1');
+			expect(fd.get('b')).toBe('foo');
 		});
 	});
 
 	describe('includes', () => {
-		test('simple', () => expect(includes(TEST_OBJECT, {a: 1})).toBeTruthy());
-		test('nested', () => expect(includes(TEST_OBJECT, {g: {h: 8}})).toBeTruthy());
-		test('array', () => expect(includes(TEST_OBJECT, {b: [[2]]})).toBeTruthy());
-		test('nested array', () => expect(includes(TEST_OBJECT, {a: 1, c: {d: [[{e: 6}]]}})).toBeTruthy());
-		test('wong nested array', () => expect(includes(TEST_OBJECT, {a: 1, c: {d: [{e: 7}]}})).toBeFalsy());
-		test('wrong value', () => expect(includes(TEST_OBJECT, {a: 1, b: 2})).toBeFalsy());
-		test('missing value', () => expect(includes(TEST_OBJECT, {a: 1, i: 10})).toBeFalsy());
+		it('checks if all values included', () => {
+			expect(includes({ a: 2, b: 3 }, { a: 2 })).toBeTruthy();
+			expect(includes({ a: 2, b: 3 }, { c: 1 })).toBeFalsy();
+		});
+		it('handles arrays of values', () => {
+			expect(includes([{ a: 1 }], [{ a: 1 }])).toBeTruthy();
+			expect(includes([{ a: 1 }], [{ a: 2 }])).toBeFalsy();
+		});
+		it('allows missing when specified', () => {
+			expect(includes(undefined, { a: 2 }, true)).toBeTruthy();
+		});
 	});
 
 	describe('isEqual', () => {
-		test('boolean equal', () => expect(isEqual(true, true)).toBeTruthy());
-		test('boolean not-equal', () => expect(isEqual(true, false)).toBeFalsy());
-		test('number equal', () => expect(isEqual(1, 1)).toBeTruthy());
-		test('number not-equal', () => expect(isEqual(1, 0)).toBeFalsy());
-		test('string equal', () => expect(isEqual('abc', 'abc')).toBeTruthy());
-		test('string not-equal', () => expect(isEqual('abc', '')).toBeFalsy());
-		test('array equal', () => expect(isEqual([true, 1, 'a'], [true, 1, 'a'])).toBeTruthy());
-		test('array not-equal', () => expect(isEqual([true, 1, 'a'], [1])).toBeFalsy());
-		test('object equal', () => expect(isEqual({a: 1, b: 2}, {a: 1, b: 2})).toBeTruthy());
-		test('object not-equal', () => expect(isEqual({a: 1, b: 2}, {a: 1})).toBeFalsy());
-		test('complex', () => expect(isEqual(TEST_OBJECT, TEST_OBJECT)).toBeTruthy());
+		it('returns true for deeply equal objects', () => {
+			expect(isEqual({ a: 1, b: { c: 3 } }, { a: 1, b: { c: 3 } })).toBe(true);
+		});
+		it('returns false for non-equal objects', () => {
+			expect(isEqual({ a: 1 }, { a: 2 })).toBe(false);
+		});
+		it('compares functions by string', () => {
+			expect(isEqual(() => 1, () => 1)).toBe(true);
+		});
 	});
 
-	describe('flattenObj', () => {
-		test('simple nested object', () => expect(flattenObj({a: {b: {c: 1}}})).toEqual({"a.b.c": 1}));
-		test('already flat object', () => expect(flattenObj(TEST_OBJECT['g'])).toEqual(TEST_OBJECT['g']));
-		test('non-object input', () => expect(flattenObj(TEST_OBJECT['b'])).toBeUndefined());
-		test('complex nested object', () => expect(flattenObj({a: 1, b: {c: 2}, d: {e: {f: {g: 3}}}}))
-			.toEqual({"a": 1, "b.c": 2, "d.e.f.g": 3}));
+	describe('mixin', () => {
+		it('merges prototypes', () => {
+			class A { foo() { return 1; } }
+			class B { bar() { return 2; } }
+			class C {}
+			mixin(C, [A, B]);
+			const c = new (C as any)();
+			expect(c.foo()).toBe(1);
+			expect(c.bar()).toBe(2);
+		});
 	});
 });

tests/path-events.spec.ts

@@ -0,0 +1,202 @@
+import {PathError, PathEvent, PathEventEmitter, PE, PES} from '../src';
+
+describe('Path Events', () => {
+	beforeEach(() => {
+		PathEvent.clearCache();
+	});
+
+	describe('PE', () => {
+		it('creates PathEvent from template string', () => {
+			const e = PE`users/system:cr`;
+			expect(e).toBeInstanceOf(PathEvent);
+			expect(e.fullPath).toBe('users/system');
+			expect(e.create).toBe(true);
+			expect(e.read).toBe(true);
+		});
+
+		it('handles interpolation', () => {
+			const path = 'users/system';
+			const meth = 'r';
+			const e = PE`${path}:${meth}`;
+			expect(e.fullPath).toBe('users/system');
+			expect(e.read).toBe(true);
+		});
+	});
+
+	describe('PES', () => {
+		it('creates string for event', () => {
+			expect(PES`users/system:cr`).toBe('users/system:cr');
+		});
+	});
+
+	describe('PathEvent', () => {
+		it('parses event string', () => {
+			const pe = new PathEvent('users/system:cr');
+			expect(pe.module).toBe('users');
+			expect(pe.fullPath).toBe('users/system');
+			expect(pe.name).toBe('system');
+			expect(pe.create).toBe(true);
+			expect(pe.read).toBe(true);
+		});
+
+		it('parses wildcard', () => {
+			const pe = new PathEvent('*');
+			expect(pe.all).toBe(true);
+			expect(pe.fullPath).toBe('');
+			expect(pe.methods.has('*')).toBe(true);
+		});
+
+		it('parses none method', () => {
+			const pe = new PathEvent('users/system:n');
+			expect(pe.none).toBe(true);
+			pe.none = false;
+			expect(pe.none).toBe(false);
+		});
+
+		it('setters for methods', () => {
+			const pe = new PathEvent('users/system:r');
+			pe.create = true;
+			expect(pe.methods.has('c')).toBe(true);
+			pe.update = true;
+			expect(pe.methods.has('u')).toBe(true);
+			pe.delete = true;
+			expect(pe.methods.has('d')).toBe(true);
+			pe.read = false;
+			expect(pe.methods.has('r')).toBe(false);
+		});
+
+		it('combine merges longest path and methods', () => {
+			const a = new PathEvent('users/sys:cr');
+			const b = new PathEvent('users/sys:u');
+			const c = PathEvent.combine(a, b);
+			expect(c.fullPath).toBe('users/sys');
+			expect(c.methods.has('c')).toBe(true);
+			expect(c.methods.has('r')).toBe(true);
+			expect(c.methods.has('u')).toBe(true);
+		});
+
+		it('combine stops at none', () => {
+			const a = new PathEvent('data/collection/doc:c');
+			const b = new PathEvent('data/collection:r');
+			const c = new PathEvent('data:n');
+			const d = PathEvent.combine(a, b, c);
+			expect(d.fullPath).toBe(a.fullPath);
+			expect(d.create).toBe(true);
+			expect(d.read).toBe(true);
+			expect(d.update).toBe(false);
+			expect(d.none).toBe(false);
+		});
+
+		it('filter finds overlap by path and methods', () => {
+			const events = [
+				new PathEvent('users/sys:cr'),
+				new PathEvent('users/sys:r'),
+				new PathEvent('files/sys:r')
+			];
+			const filtered = PathEvent.filter(events, 'users/sys:r');
+			expect(filtered.length).toBe(2);
+		});
+
+		it('filter handles wildcard', () => {
+			const events = [
+				new PathEvent('*'),
+				new PathEvent('users/sys:r')
+			];
+			const filtered = PathEvent.filter(events, 'users/sys:r');
+			expect(filtered.length).toBe(2);
+		});
+
+		it('has returns true for overlapping', () => {
+			const events = [new PathEvent('users/sys:cr')];
+			expect(PathEvent.has(events, 'users/sys:r')).toBeTruthy();
+			expect(PathEvent.has(events, 'users/nope:r')).toBeFalsy();
+		});
+
+		it('hasAll returns true only if all overlap', () => {
+			const events = [
+				new PathEvent('users/sys:cr'),
+				new PathEvent('users/sys:u'),
+			];
+			expect(PathEvent.hasAll(events, 'users/sys:c', 'users/sys:u')).toBe(true);
+			expect(PathEvent.hasAll(events, 'users/sys:c', 'users/sys:no')).toBe(false);
+		});
+
+		it('hasFatal throws if not found', () => {
+			expect(() => PathEvent.hasFatal('users/sys:r', 'users/other:r')).toThrow(PathError);
+			expect(() => PathEvent.hasFatal('users/sys:r', 'users/sys:r')).not.toThrow();
+		});
+
+		it('hasAllFatal throws if missing', () => {
+			expect(() => PathEvent.hasAllFatal(['users/sys:r'], 'users/sys:r', 'users/sys:c')).toThrow(PathError);
+		});
+
+		it('toString creates correct event string', () => {
+			const s = PathEvent.toString('users/sys', ['c', 'r']);
+			expect(s).toBe('users/sys:cr');
+			const pe = new PathEvent('users/sys:cr');
+			expect(pe.toString()).toBe('users/sys:cr');
+		});
+
+		it('filter instance filters as expected', () => {
+			const pe = new PathEvent('users/sys:r');
+			const arr = ['users/sys:r', 'users/other:r'];
+			const filtered = pe.filter(arr);
+			expect(filtered[0].fullPath).toBe('users/sys');
+		});
+	});
+
+	describe('PathEventEmitter', () => {
+		it('wildcard', done => {
+			const emitter = new PathEventEmitter();
+			emitter.on('*', (event) => {
+				expect(event.fullPath).toBe('system');
+				done();
+			});
+			emitter.emit('system:c');
+		});
+
+		it('scoped', done => {
+			const emitter = new PathEventEmitter('users');
+			emitter.on(':cud', (event) => {
+				expect(event.fullPath).toBe('users/system');
+				done();
+			});
+			emitter.emit('system:u');
+		});
+
+		it('calls listener on matching emit', done => {
+			const emitter = new PathEventEmitter();
+			const fn = jest.fn((event) => {
+				expect(event.fullPath).toBe('users/sys');
+				done();
+			});
+			emitter.on('users/sys:r', fn);
+			emitter.emit('users/sys:r');
+		});
+
+		it('off removes listener', () => {
+			const emitter = new PathEventEmitter();
+			const fn = jest.fn();
+			emitter.on('users/sys:r', fn);
+			emitter.off(fn);
+			emitter.emit('users/sys:r');
+			expect(fn).not.toHaveBeenCalled();
+		});
+
+		it('on returns unsubscribe function', () => {
+			const emitter = new PathEventEmitter();
+			const fn = jest.fn();
+			const unsub = emitter.on('users/sys:r', fn);
+			unsub();
+			emitter.emit('users/sys:r');
+			expect(fn).not.toHaveBeenCalled();
+		});
+
+		it('emit supports prefix', () => {
+			const emitter = new PathEventEmitter('foo');
+			emitter.once('*', (event) =>
+				expect(event.fullPath).toBe('foo/bar'));
+			emitter.emit('bar:r');
+		});
+	});
+});

tests/search.spec.ts

@@ -0,0 +1,142 @@
+import {logicTest, search} from '../src';
+
+const rows = [
+	{id: 1, name: 'Alice', age: 30},
+	{id: 2, name: 'Bob', age: 24},
+	{id: 3, name: 'Carol', age: 30},
+	{id: 4, name: 'David', age: 35},
+];
+
+describe('Search Utilities', () => {
+	describe('search', () => {
+		it('returns empty array for null rows', () => {
+			expect(search(null as any, 'test')).toEqual([]);
+		});
+
+		it('returns all rows if search is empty', () => {
+			expect(search(rows, '')).toEqual(rows);
+		});
+
+		it('filters based on a simple property string', () => {
+			expect(search(rows, 'Alice')).toEqual([rows[0]]);
+		});
+
+		it('filters using regex when regex=true', () => {
+			expect(search(rows, '^B', true)).toEqual([rows[1]]);
+		});
+
+		it('applies the transform function before filtering', () => {
+			const transform = (r: any) => ({...r, name: r.name.toLowerCase()});
+			expect(search(rows, 'alice', false, transform)).toEqual([rows[0]]);
+		});
+
+		it('uses logicTest for non-regex search', () => {
+			expect(search(rows, 'age == 30')).toEqual([rows[0], rows[2]]);
+			expect(search(rows, 'id = 2')).toEqual([rows[1]]);
+		});
+
+		it('returns all if search is falsy and regex enabled', () => {
+			expect(search(rows, '', true)).toEqual(rows);
+		});
+
+		it('handles regex search with special characters', () => {
+			expect(search(rows, '^[AC]', true)).toEqual([rows[0], rows[2]]);
+		});
+
+		it('ignores case when regex is applied', () => {
+			expect(search(rows, 'ALICE', true)).toEqual([]);
+		});
+
+		it('performs partial matches for properties when regex=false', () => {
+			expect(search(rows, 'Da')).toEqual([rows[3]]);
+		});
+
+		it('handles empty array input gracefully', () => {
+			expect(search([], 'test')).toEqual([]);
+		});
+
+		it('handles numeric values with comparison logic in strings', () => {
+			expect(search(rows, 'age < 31')).toEqual([rows[0], rows[1], rows[2]]);
+		});
+
+		// New test cases for `+` and `-` operators
+		it('filters rows using the + operator', () => {
+			expect(search(rows, 'name += Al')).toEqual([rows[0]]);
+		});
+
+		it('filters rows using the - operator', () => {
+			expect(search(rows, 'name -= Al')).toEqual([rows[1], rows[2], rows[3]]);
+		});
+	});
+
+	describe('logicTest', () => {
+		const obj = {x: 10, y: 5, name: 'Alpha'};
+
+		it('handles equality and inequality', () => {
+			expect(logicTest(obj, 'x == 10')).toBe(true);
+			expect(logicTest(obj, 'y != 5')).toBe(false);
+		});
+
+		it('handles comparison operators', () => {
+			expect(logicTest(obj, 'x > 5')).toBe(true);
+			expect(logicTest(obj, 'y <= 10')).toBe(true);
+			expect(logicTest(obj, 'x < 5')).toBe(false);
+		});
+
+		it('supports case insensitive property search', () => {
+			expect(logicTest(obj, 'alpha')).toBeTruthy();
+			expect(logicTest(obj, 'ALPHA')).toBeFalsy();
+		});
+
+		it('handles logical AND/OR expressions', () => {
+			expect(logicTest(obj, 'x == 10 && y == 5')).toBe(true);
+			expect(logicTest(obj, 'x == 10 || y == 100')).toBe(true);
+			expect(logicTest(obj, 'x == 1 && y == 5')).toBe(false);
+		});
+
+		it('returns false for unsupported operators', () => {
+			expect(logicTest(obj, 'x === 10')).toBe(false);
+		});
+
+		it('handles invalid condition strings gracefully', () => {
+			expect(logicTest(obj, 'invalid condition')).toBe(false);
+		});
+
+		it('supports numeric operations with ranges', () => {
+			expect(logicTest(obj, 'x > 5 && x < 15')).toBe(true);
+			expect(logicTest(obj, 'x > 15')).toBe(false);
+		});
+
+		it('handles mixed case keys gracefully', () => {
+			const mixedCaseObj = {TestKey: 123};
+			expect(logicTest(mixedCaseObj, 'TestKey == 123')).toBe(true);
+			expect(logicTest(mixedCaseObj, 'testkey == 123')).toBe(true);
+		});
+
+		it('returns false if condition operators are missing', () => {
+			expect(logicTest(obj, 'x 10')).toBe(false);
+		});
+
+		// New test cases for `+` and `-` operators
+		it('handles the + operator for inclusion', () => {
+			expect(logicTest(obj, 'name += Alpha')).toBe(true);
+			expect(logicTest(obj, 'name += Alp')).toBe(true);
+			expect(logicTest(obj, 'name += Bet')).toBe(false);
+		});
+
+		it('handles the - operator for exclusion', () => {
+			expect(logicTest(obj, 'name -= Alpha')).toBe(false);
+			expect(logicTest(obj, 'name -= Alp')).toBe(false);
+			expect(logicTest(obj, 'name -= Bet')).toBe(true);
+		});
+
+		it('includes partial matches correctly with +', () => {
+			expect(logicTest(obj, 'name += lph')).toBe(true);
+		});
+
+		it('excludes partial matches correctly with -', () => {
+			expect(logicTest(obj, 'name -= lph')).toBe(false);
+			expect(logicTest(obj, 'name -= xyz')).toBe(true);
+		});
+	});
+});

tests/string.spec.ts

@@ -1,50 +1,168 @@
-import {matchAll, randomString, randomStringBuilder} from "../src";
+import {
+	camelCase,
+	CHAR_LIST,
+	formatBytes,
+	formatPhoneNumber,
+	insertAt, kebabCase,
+	LETTER_LIST, matchAll, md5,
+	NUMBER_LIST, pad, parseUrl, pascalCase, randomHex, randomString, randomStringBuilder, snakeCase, strSplice,
+	SYMBOL_LIST
+} from '../src';
 
 describe('String Utilities', () => {
-	describe('randomString', () => {
-		test('length', () => expect(randomString(32).length).toStrictEqual(32));
-		test('distribution', () => {
-			const charList = '123';
-			const random = randomString(32, charList);
-			expect(random.split('').filter(c => c == '1').length).toBeGreaterThan(0);
-			expect(random.split('').filter(c => c == '2').length).toBeGreaterThan(0);
-			expect(random.split('').filter(c => c == '3').length).toBeGreaterThan(0);
+	test('LETTER_LIST, NUMBER_LIST, SYMBOL_LIST, CHAR_LIST', () => {
+		expect(LETTER_LIST).toBe('ABCDEFGHIJKLMNOPQRSTUVWXYZ');
+		expect(NUMBER_LIST).toBe('0123456789');
+		expect(SYMBOL_LIST).toContain('@');
+		expect(CHAR_LIST).toContain('A');
+		expect(CHAR_LIST).toContain('a');
+		expect(CHAR_LIST).toContain('5');
+		expect(CHAR_LIST).toContain('!');
+	});
+
+	describe('camelCase', () => {
+		it('converts to camelCase', () => {
+			expect(camelCase('hello_world')).toBe('helloWorld');
+			expect(camelCase('Hello world test')).toBe('helloWorldTest');
 		});
-		test('binary', () => {
-			const randomByte = randomString(8, '01');
-			expect(randomByte.split('').filter(c => c == '0').length).toBeGreaterThan(0);
-			expect(randomByte.split('').filter(c => c == '1').length).toBeGreaterThan(0);
-			expect(randomByte.length).toStrictEqual(8);
+		it('returns empty string if value is falsy', () => {
+			expect(camelCase()).toBe('');
+			expect(camelCase('')).toBe('');
+		});
+	});
+
+	describe('formatBytes', () => {
+		it('correctly formats bytes', () => {
+			expect(formatBytes(0)).toBe('0 Bytes');
+			expect(formatBytes(1024)).toBe('1 KB');
+			expect(formatBytes(1024 * 1024)).toBe('1 MB');
+			expect(formatBytes(1234, 1)).toBe('1.2 KB');
+		});
+	});
+
+	describe('formatPhoneNumber', () => {
+		it('formats plain phone numbers', () => {
+			expect(formatPhoneNumber('1234567890')).toBe('(123) 456-7890');
+			expect(formatPhoneNumber('+11234567890')).toBe('+1 (123) 456-7890');
+			expect(formatPhoneNumber('1 123 456 7890')).toBe('+1 (123) 456-7890');
+		});
+		it('throws for invalid phone strings', () => {
+			expect(() => formatPhoneNumber('abc')).toThrow();
+		});
+	});
+
+	describe('insertAt', () => {
+		it('inserts a string at a given index', () => {
+			expect(insertAt('Hello!', 'X', 5)).toBe('HelloX');
+		});
+	});
+
+	describe('kebabCase', () => {
+		it('converts to kebab-case', () => {
+			expect(kebabCase('hello world')).toBe('hello-world');
+			expect(kebabCase('HelloWorld')).toContain('hello-world');
+			expect(kebabCase('')).toBe('');
+		});
+	});
+
+	describe('pad', () => {
+		it('pads start by default', () => {
+			expect(pad('1', 2, '0')).toBe('01');
+		});
+		it('pads end if start is false', () => {
+			expect(pad('1', 3, '0', false)).toBe('100');
+		});
+	});
+
+	describe('pascalCase', () => {
+		it('converts to PascalCase', () => {
+			expect(pascalCase('hello_world')).toBe('HelloWorld');
+			expect(pascalCase('')).toBe('');
+		});
+	});
+
+	describe('randomHex', () => {
+		it('creates a random hex string of correct length', () => {
+			expect(randomHex(8)).toHaveLength(8);
+			expect(/^[a-f0-9]{8}$/i.test(randomHex(8))).toBe(true);
+		});
+	});
+
+	describe('randomString', () => {
+		it('creates a random string from CHAR_LIST of correct length', () => {
+			const s = randomString(10);
+			expect(s).toHaveLength(10);
+			// letters, numbers, symbols all included in CHAR_LIST
+		});
+		it('uses provided pool', () => {
+			expect(['0','1']).toContain(randomString(1, '01'));
 		});
 	});
 
 	describe('randomStringBuilder', () => {
-		test('length', () => {
-			const len = ~~(Math.random() * 32);
-			expect(randomStringBuilder(len, true).length).toStrictEqual(len);
+		it('creates with just letters', () => {
+			expect(/^[A-Z]+$/.test(randomStringBuilder(5, true, false, false))).toBe(true);
 		});
-		test('no length', () => {
-			expect(randomStringBuilder(0, true)).toStrictEqual('');
+		it('creates with just numbers', () => {
+			expect(/^[0-9]+$/.test(randomStringBuilder(5, false, true, false))).toBe(true);
 		});
-		test('letters only', () =>
-			expect(/^[a-zA-Z]{10}$/g.test(randomStringBuilder(10, true))).toBeTruthy());
-		test('numbers only', () =>
-			expect(/^[0-9]{10}$/g.test(<any>randomStringBuilder(10, false, true))).toBeTruthy());
-		test('symbols only', () =>
-			expect(/^[^a-zA-Z0-9]{10}$/g.test(randomStringBuilder(10, false, false, true))).toBeTruthy());
-		test('everything', () => {
-			const randomString = randomStringBuilder(30, true, true, true);
-			expect(/[a-zA-Z]/g.test(randomString)).toBeTruthy();
-			expect(/[0-9]/g.test(randomString)).toBeTruthy();
-			expect(/[^a-zA-Z0-9]/g.test(randomString)).toBeTruthy();
+		it('creates with just symbols', () => {
+			expect(SYMBOL_LIST).toContain(randomStringBuilder(1, false, false, true));
+		});
+		it('throws if all false', () => {
+			expect(() => randomStringBuilder(5, false, false, false)).toThrow();
+		});
+	});
+
+	describe('snakeCase', () => {
+		it('converts to snake_case', () => {
+			expect(snakeCase('helloWorld')).toContain('hello_world');
+			expect(snakeCase('')).toBe('');
+		});
+	});
+
+	describe('strSplice', () => {
+		it('splices string as expected', () => {
+			expect(strSplice('abcdef', 2, 2, 'ZZ')).toBe('abZZef');
+			expect(strSplice('abcdef', 1, 0, 'Z')).toBe('aZbcdef');
 		});
-		test('no pool', () =>
-			expect(() => randomStringBuilder(10, false, false, false)).toThrow());
 	});
 
 	describe('matchAll', () => {
-		test('using string', () => expect(matchAll('fooBar fooBar FooBar', 'fooBar').length).toBe(2));
-		test('using regex', () => expect(matchAll('fooBar fooBar FooBar', /fooBar/g).length).toBe(2));
-		test('using malformed regex', () => expect(() => matchAll('fooBar fooBar FooBar', /fooBar/)).toThrow());
+		it('returns expected matches', () => {
+			const matches = matchAll('a1 b2 c3', /\d/g);
+			expect(matches.length).toBe(3);
+			expect(matches[0][0]).toBe('1');
+		});
+		it('throws for non-global regex', () => {
+			expect(() => matchAll('abc', /a/)).toThrow();
+		});
+		it('accepts regex string', () => {
+			const matches = matchAll('a1a2', '\\d');
+			expect(matches.length).toBe(2);
+		});
+	});
+
+	describe('parseUrl', () => {
+		it('parses a full url', () => {
+			const url = parseUrl('https://sub.example.com:8000/path?a=1&b=2#frag');
+			expect(url.protocol).toBe('https');
+			expect(url.subdomain).toBe('sub');
+			expect(url.domain).toBe('example.com');
+			expect(url.port).toBe(8000);
+			expect(url.path).toBe('/path');
+			expect(url.query).toEqual({ a: '1', b: '2' });
+			expect(url.fragment).toBe('frag');
+		});
+		it('parses domain without subdomain', () => {
+			const url = parseUrl('https://example.com');
+			expect(url.domain).toBe('example.com');
+		});
+	});
+
+	describe('md5', () => {
+		it('hashes string to hex', () => {
+			expect(md5('test')).toMatch(/^[a-f0-9]+$/i);
+		});
 	});
 });

tests/time.spec.ts

@@ -0,0 +1,108 @@
+import {adjustedInterval, formatDate, instantInterval, sleep, sleepWhile, timeUntil} from '../src';
+
+jest.useFakeTimers();
+
+describe('Time Utilities', () => {
+	describe('adjustedInterval', () => {
+		it('calls callback at roughly correct intervals, considering execution time', async () => {
+			const cb = jest.fn(() => new Promise(res => setTimeout(res, 5)));
+			const stop = adjustedInterval(cb, 50);
+
+			expect(cb).toHaveBeenCalledTimes(1);
+
+			await jest.advanceTimersByTimeAsync(50);
+			expect(cb).toHaveBeenCalledTimes(2);
+
+			await jest.advanceTimersByTimeAsync(100);
+			expect(cb).toHaveBeenCalledTimes(4);
+
+			stop();
+			await jest.advanceTimersByTimeAsync(100);
+			expect(cb).toHaveBeenCalledTimes(4);
+		});
+	});
+
+	describe('formatDate', () => {
+		it('formats current date correctly with default format', () => {
+			const result = formatDate('YYYY-MM-DD', new Date('2023-01-15T10:30:30.000Z'), 0);
+			expect(result).toBe('2023-01-15');
+		});
+
+		it('handles formatting for given timestamp', () => {
+			const timestamp = Date.UTC(2023, 1, 1, 18, 5, 5, 123); // Feb 1, 2023 18:05:05.123 UTC
+			const formatted = formatDate('YYYY MM DD HH mm ss SSS A Z', timestamp, 'UTC');
+			expect(formatted).toMatch(/^2023 02 01 18 05 05 123 PM \+00:00/i);
+		});
+
+		it('throws for unknown timezone', () => {
+			expect(() => formatDate('YYYY', new Date(), '???')).toThrowError(/Invalid timezone/);
+		});
+
+		it('handles timezone by offset number', () => {
+			const dt = new Date('2020-01-01T00:00:00.000Z');
+			const str = formatDate('HH:mm z', dt, 1);
+			expect(str).toMatch(/01:00/);
+		});
+
+		it('handles Do, MMMM, dddd tokens', () => {
+			const dt = new Date('2021-03-03T09:00:00Z');
+			const result = formatDate('Do MMMM dddd', dt, 0);
+			expect(result).toMatch(/^3rd March Wednesday$/);
+		});
+	});
+
+	describe('instantInterval', () => {
+		it('calls function immediately then at intervals', () => {
+			const cb = jest.fn();
+			const id = instantInterval(cb, 1000);
+			expect(cb).toHaveBeenCalledTimes(1);
+
+			jest.advanceTimersByTime(1000);
+			expect(cb).toHaveBeenCalledTimes(2);
+
+			clearInterval(id);
+		});
+	});
+
+	describe('sleep', () => {
+		it('waits the given ms', async () => {
+			const time = Date.now(), wait = 100;
+			const promise = sleep(wait);
+			jest.advanceTimersByTime(wait);
+			await promise;
+			expect(Date.now()).toBeGreaterThanOrEqual(time + wait);
+		});
+	});
+
+	describe('sleepWhile', () => {
+		it('resolves once condition is false', async () => {
+			const time = Date.now(), wait = 300;
+			let flag = true;
+			const promise = sleepWhile(() => flag, 100);
+			setTimeout(() => { flag = false; }, wait);
+			await jest.advanceTimersByTimeAsync(wait);
+			await promise;
+			expect(Date.now()).toBeGreaterThanOrEqual(time + wait);
+		});
+	});
+
+	describe('timeUntil', () => {
+		it('returns milliseconds until given date', () => {
+			const now = Date.now();
+			const future = now + 1000;
+			jest.spyOn(Date, 'now').mockReturnValue(now);
+
+			const result = timeUntil(future);
+			expect(result).toBe(1000);
+		});
+
+		it('accepts Date object', () => {
+			const now = new Date();
+			const t = new Date(now.getTime() + 450);
+			jest.spyOn(global, 'Date').mockImplementation(() => now as any);
+
+			const result = timeUntil(t);
+			expect(result).toBe(450);
+		});
+	});
+});

tests/type.spec.ts

@@ -0,0 +1,18 @@
+import {Writable} from '../src';
+
+describe('Type Utilities', () => {
+	describe('Writable', () => {
+		it('should create a writable version of a readonly type', () => {
+			type ReadonlyPerson = {
+				readonly name: string;
+				readonly age: number;
+			};
+			type WritablePerson = Writable<ReadonlyPerson>;
+			// Typescript: WritablePerson's properties should not be readonly
+			const person: WritablePerson = { name: 'Alice', age: 40 };
+			person.name = 'Bob'; // Should not error in TypeScript
+			person.age = 41;     // Should not error in TypeScript
+			expect(person).toEqual({ name: 'Bob', age: 41 });
+		});
+	});
+});

tsconfig.json

@@ -1,7 +1,7 @@
 {
 	"include": ["src"],
 	"compilerOptions": {
-		"target": "ES2020",
+		"target": "ESNext",
 		"useDefineForClassFields": true,
 		"module": "ESNext",
 		"lib": ["ESNext", "DOM", "DOM.Iterable"],