44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
/* @flow */
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/* eslint-disable prefer-template, no-param-reassign, no-lonely-if */
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// https://github.com/KyleAMathews/deepmerge/blob/master/index.js
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export default function deepmerge<T: any>(target: any, src: T): T {
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const array = Array.isArray(src);
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let dst: T = ((array && []) || {}: any);
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if (array) {
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target = target || [];
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dst = dst.concat(target);
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src.forEach((e, i) => {
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if (typeof dst[i] === 'undefined') {
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dst[i] = e;
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} else if (typeof e === 'object') {
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dst[i] = deepmerge(target[i], e);
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} else {
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if (target.indexOf(e) === -1) {
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dst.push(e);
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}
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}
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});
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} else {
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if (target && typeof target === 'object') {
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Object.keys(target).forEach(key => {
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dst[key] = target[key];
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});
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}
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Object.keys(src).forEach(key => {
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if (typeof src[key] !== 'object' || !src[key]) {
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dst[key] = src[key];
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} else {
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if (!target[key]) {
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dst[key] = src[key];
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} else {
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dst[key] = deepmerge(target[key], src[key]);
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}
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}
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});
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}
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return dst;
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}
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