@modern-js/libuild-utils/dist/deepMerge.js

utils for libuild

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.deepMerge = void 0;
const assert_1 = require("./assert");
function deepMerge(lower, higher) {
    if (arguments.length !== 2 || !(0, assert_1.isObject)(lower) || !(0, assert_1.isObject)(higher)) {
        throw Error(`${lower} and ${higher} must be Object`);
    }
    const merged = { ...lower };
    for (const key in higher) {
        const value = higher[key];
        if (value == null) {
            continue;
        }
        const existing = merged[key];
        if (Array.isArray(existing) && Array.isArray(value)) {
            merged[key] = [...existing, ...value];
        }
        else if ((0, assert_1.isObject)(existing) && (0, assert_1.isObject)(value)) {
            merged[key] = deepMerge(existing, value);
        }
        else {
            merged[key] = value;
        }
    }
    return merged;
}
exports.deepMerge = deepMerge;