Added promise progress

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@ztimson/utils",
-	"version": "0.7.2",
+	"version": "0.9.0",
 	"description": "Utility library",
 	"author": "Zak Timson",
 	"license": "MIT",

src/download.ts

@@ -1,10 +1,3 @@
-import {TypedEmitter, TypedEvents} from './emitter';
-
-export type downloadEvents = TypedEvents & {
-	complete: (blob: Blob) => any;
-	progress: (progress: number) => any;
-}
-
 export function download(href: any, name: string) {
 	const a = document.createElement('a');
 	a.href = href;
@@ -13,40 +6,3 @@ export function download(href: any, name: string) {
 	a.click();
 	document.body.removeChild(a);
 }
-
-/**
- * Download a URL using fetch so progress can be tracked. Uses Typed Emitter to emit a "progress" &
- * "complete" event.
- *
- * @param {string} url
- * @param {string} downloadName
- * @return {TypedEmitter<downloadEvents>}
- */
-export function downloadProgress(url: string, downloadName?: string) {
-	const emitter = new TypedEmitter<downloadEvents>();
-	fetch(url).then(response => {
-		const contentLength = response.headers.get('Content-Length') || '0';
-		const total = parseInt(contentLength, 10);
-		let chunks: any[] = [], loaded = 0;
-		const reader = response.body?.getReader();
-		reader?.read().then(function processResult(result) {
-			if(result.done) {
-				const blob = new Blob(chunks);
-				if(downloadName) {
-					const url = URL.createObjectURL(blob);
-					download(url, downloadName);
-					URL.revokeObjectURL(url);
-				}
-				emitter.emit('complete', blob);
-			} else {
-				const chunk = result.value;
-				chunks.push(chunk);
-				loaded += chunk.length;
-				const progress = loaded / total;
-				emitter.emit('progress', progress);
-				reader.read().then(processResult);
-			}
-		});
-	});
-	return emitter;
-}

src/index.ts

@@ -6,6 +6,7 @@ export * from './errors';
 export * from './logger';
 export * from './misc';
 export * from './objects';
+export * from './promise-progress';
 export * from './string';
 export * from './time';
 export * from './xhr';

src/promise-progress.ts

@@ -0,0 +1,26 @@
+export type ProgressCallback = (progress: number) => any;
+
+export class PromiseProgress<T> extends Promise<T> {
+	private listeners: ProgressCallback[] = [];
+
+	private _progress = 0;
+	get progress() { return this._progress; }
+	set progress(p: number) {
+		if(p == this._progress) return;
+		this._progress = p;
+		this.listeners.forEach(l => l(p));
+	}
+
+	constructor(executor: (resolve: (value: T) => any, reject: (reason: any) => void, progress: (progress: number) => any) => void) {
+		super((resolve, reject) => executor(
+			(value: T) => resolve(value),
+			(reason: any) => reject(reason),
+			(progress: number) => this.progress = progress
+		));
+	}
+
+	onProgress(callback: ProgressCallback) {
+		this.listeners.push(callback);
+		return this;
+	}
+}

src/xhr.ts

@@ -1,4 +1,3 @@
-import {TypedEmitter, TypedEvents} from './emitter.ts';
 import {clean} from './objects';
 
 export type Interceptor = (request: Response, next: () => void) => void;