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util.ts
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util.ts
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/* eslint-disable @typescript-eslint/no-unnecessary-type-assertion */
/* eslint-disable @typescript-eslint/consistent-type-assertions */
import type { Context } from "koa";
import qs from "qs";
import { MEILISEARCH_HOST } from "./config.js";
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: Context,
query_params: Record<string, unknown>
): string {
return `${ctx.path}?${qs.stringify(query_params)}`;
}
export function pickRandom<T>(array: [T, ...T[]]): T {
return array?.[Math.floor(Math.random() * array.length)] || array[0];
}
export function isNonEmpty<T>(a: Array<T>): a is NonEmptyArray<T> {
return isNonEmpty.length > 0;
}
export type NonEmptyArray<T> = [T, ...T[]];
export function pickN<T>(array: [T, ...T[]], n: number): T[] {
const s = new Set<T>();
while (s.size != n) {
s.add(pickRandom(array));
}
return Array.from(s.values());
}
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.
[array_copy[currentIndex], array_copy[randomIndex]] = [
array_copy[randomIndex] as T,
array_copy[currentIndex] as T,
];
}
return array_copy;
}
export const toCheckboxValues = (arr: string[]): Record<string, string> =>
arr.reduce((acc: Record<string, string>, key) => {
acc[key] = "on";
return acc;
}, {});
export const fromCheckboxValues = (arr: Record<string, string> | null): string[] => {
if (!arr) {
return [];
}
return Object.entries(arr)
.filter(([, value]) => value === "on")
.map(([key]) => key);
};

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