42 lines
1.6 KiB
JavaScript
42 lines
1.6 KiB
JavaScript
import { isSome } from './helpers.js';
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export function mergeDeep(sources, respectPrototype = false) {
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const target = sources[0] || {};
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const output = {};
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if (respectPrototype) {
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Object.setPrototypeOf(output, Object.create(Object.getPrototypeOf(target)));
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}
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for (const source of sources) {
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if (isObject(target) && isObject(source)) {
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if (respectPrototype) {
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const outputPrototype = Object.getPrototypeOf(output);
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const sourcePrototype = Object.getPrototypeOf(source);
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if (sourcePrototype) {
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for (const key of Object.getOwnPropertyNames(sourcePrototype)) {
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const descriptor = Object.getOwnPropertyDescriptor(sourcePrototype, key);
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if (isSome(descriptor)) {
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Object.defineProperty(outputPrototype, key, descriptor);
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}
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}
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}
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}
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for (const key in source) {
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if (isObject(source[key])) {
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if (!(key in output)) {
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Object.assign(output, { [key]: source[key] });
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}
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else {
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output[key] = mergeDeep([output[key], source[key]], respectPrototype);
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}
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}
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else {
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Object.assign(output, { [key]: source[key] });
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}
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}
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}
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}
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return output;
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}
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function isObject(item) {
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return item && typeof item === 'object' && !Array.isArray(item);
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}
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