41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
import _extends from "@babel/runtime/helpers/esm/extends";
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// https://github.com/sindresorhus/is-plain-obj/blob/main/index.js
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export function isPlainObject(item) {
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if (typeof item !== 'object' || item === null) {
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return false;
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}
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const prototype = Object.getPrototypeOf(item);
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return (prototype === null || prototype === Object.prototype || Object.getPrototypeOf(prototype) === null) && !(Symbol.toStringTag in item) && !(Symbol.iterator in item);
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}
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function deepClone(source) {
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if (!isPlainObject(source)) {
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return source;
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}
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const output = {};
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Object.keys(source).forEach(key => {
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output[key] = deepClone(source[key]);
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});
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return output;
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}
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export default function deepmerge(target, source, options = {
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clone: true
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}) {
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const output = options.clone ? _extends({}, target) : target;
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if (isPlainObject(target) && isPlainObject(source)) {
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Object.keys(source).forEach(key => {
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// Avoid prototype pollution
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if (key === '__proto__') {
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return;
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}
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if (isPlainObject(source[key]) && key in target && isPlainObject(target[key])) {
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// Since `output` is a clone of `target` and we have narrowed `target` in this block we can cast to the same type.
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output[key] = deepmerge(target[key], source[key], options);
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} else if (options.clone) {
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output[key] = isPlainObject(source[key]) ? deepClone(source[key]) : source[key];
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} else {
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output[key] = source[key];
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}
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});
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}
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return output;
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} |