added unit testing, and started implementing unit tests...phew

node_modules/p-limit/index.d.ts

@@ -0,0 +1,29 @@
+export interface Limit {
+	/**
+	 * @param fn - Promise-returning/async function.
+	 * @param arguments - Any arguments to pass through to `fn`. Support for passing arguments on to the `fn` is provided in order to be able to avoid creating unnecessary closures. You probably don't need this optimization unless you're pushing a lot of functions.
+	 * @returns The promise returned by calling `fn(...arguments)`.
+	 */
+	<Arguments extends unknown[], ReturnType>(
+		fn: (...arguments: Arguments) => PromiseLike<ReturnType> | ReturnType,
+		...arguments: Arguments
+	): Promise<ReturnType>;
+
+	/**
+	 * The number of promises that are currently running.
+	 */
+	readonly activeCount: number;
+
+	/**
+	 * The number of promises that are waiting to run (i.e. their internal `fn` was not called yet).
+	 */
+	readonly pendingCount: number;
+}
+
+/**
+ * Run multiple promise-returning & async functions with limited concurrency.
+ *
+ * @param concurrency - Concurrency limit. Minimum: `1`.
+ * @returns A `limit` function.
+ */
+export default function pLimit(concurrency: number): Limit;