53 lines
1.9 KiB
JavaScript
53 lines
1.9 KiB
JavaScript
"use strict";
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// The MIT License (MIT)
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//
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// Copyright (c) 2017 Firebase
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.applyChange = void 0;
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function isObject(obj) {
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return typeof obj === "object" && !!obj;
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}
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/** @hidden */
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function applyChange(src, dest) {
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// if not mergeable, don't merge
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if (!isObject(dest) || !isObject(src)) {
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return dest;
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}
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return merge(src, dest);
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}
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exports.applyChange = applyChange;
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function merge(src, dest) {
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const res = {};
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const keys = new Set([...Object.keys(src), ...Object.keys(dest)]);
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for (const key of keys.values()) {
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if (key in dest) {
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if (dest[key] === null) {
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continue;
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}
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res[key] = applyChange(src[key], dest[key]);
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}
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else if (src[key] !== null) {
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res[key] = src[key];
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}
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}
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return res;
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}
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