// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license. export function deepAssign( target: Record, ...sources: object[] ): object | undefined { for (let i = 0; i < sources.length; i++) { const source = sources[i]; if (!source || typeof source !== `object`) { return; } Object.entries(source).forEach(([key, value]: [string, unknown]): void => { if (value instanceof Date) { target[key] = new Date(value); return; } if (!value || typeof value !== `object`) { target[key] = value; return; } if (Array.isArray(value)) { target[key] = []; } // value is an Object if (typeof target[key] !== `object` || !target[key]) { target[key] = {}; } deepAssign(target[key] as Record, value); }); } return target; }