fbbf8cf16b
fbshipit-source-id: b6fc29740c6875d2e78953b8a7123890a67930f2 Co-authored-by: Sebastian McKenzie <sebmck@fb.com> Co-authored-by: John Knox <jknox@fb.com> Co-authored-by: Emil Sjölander <emilsj@fb.com> Co-authored-by: Pritesh Nandgaonkar <prit91@fb.com>
39 lines
857 B
JavaScript
39 lines
857 B
JavaScript
/**
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* Copyright 2018-present Facebook.
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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* @format
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*/
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function isObject(val: mixed): boolean {
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return (
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Boolean(val) &&
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typeof val === 'object' &&
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Object.prototype.toString.call(val) === '[object Object]'
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);
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}
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export default function assignDeep<T: Object>(
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base: T,
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...reduces: Array<Object>
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): T {
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base = Object.assign({}, base);
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for (const reduce of reduces) {
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for (const key in reduce) {
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const baseVal = base[key];
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const val = reduce[key];
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if (isObject(val) && isObject(baseVal)) {
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base[key] = assignDeep(baseVal, val);
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} else if (typeof val === 'undefined') {
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delete base[key];
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} else {
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base[key] = val;
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}
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}
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}
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return base;
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}
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