util.ts
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util.ts
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	import type { BaseContext } from "koa";
	import qs from "qs";

	export async function sleep(time: number) {
	return new Promise((resolve) => setTimeout(resolve, time));
	}

	export type Awaited<T> = T extends Promise<infer U> ? U : T;
	export type UnwrapArray<T> = T extends Array<infer U> ? U : T;

	export function* naturalNumbers(min: number, max: number) {
	for (let i = min; i <= max; i++) {
	yield i;
	}
	}

	export function UrlWithNewParams(
	ctx: BaseContext,
	query_params: Record<string, unknown>
	): string {
	return `${ctx.path}?${qs.stringify(query_params)}`;
	}

	export function shuffle<T>(array: T[]): T[] {
	const array_copy = [...array];
	let currentIndex = array_copy.length;

	// While there remain elements to shuffle...
	while (currentIndex != 0) {
	// Pick a remaining element...
	const randomIndex = Math.floor(Math.random() * currentIndex);
	currentIndex--;

	// And swap it with the current element.
	const new_value = [array_copy[randomIndex], array_copy[currentIndex]];
	if (new_value[0] && new_value[1]) {
	[array_copy[currentIndex], array_copy[randomIndex]] = new_value;
	} else {
	console.error("One of array_copy's values is undefined");
	}
	}
	return array_copy;
	}