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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.import { assert } from "./assert.ts";
export function deepAssign<T, U>(target: T, source: U): T & U;export function deepAssign<T, U, V>(  target: T,  source1: U,  source2: V,): T & U & V;export function deepAssign<T, U, V, W>(  target: T,  source1: U,  source2: V,  source3: W,): T & U & V & W;export function deepAssign(  // deno-lint-ignore no-explicit-any  target: Record<string, any>,  // deno-lint-ignore no-explicit-any  ...sources: any[]): // deno-lint-ignore ban-typesobject | 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]): 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] = {};      }      assert(value);      deepAssign(target[key] as Record<string, unknown>, value);    });  }  return target;}