Added test suite

src/types.ts

@@ -1,27 +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
- */
+/** Mark all properties as writable */
 export type Writable<T> = {
 	-readonly [P in keyof T]: T[P]
 };