mirror of
https://github.com/musix-org/musix-oss
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76 lines
2.6 KiB
JavaScript
76 lines
2.6 KiB
JavaScript
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/*! firebase-admin v8.9.2 */
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"use strict";
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/*!
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* Copyright 2017 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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/**
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* Returns a deep copy of an object or array.
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*
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* @param {object|array} value The object or array to deep copy.
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* @return {object|array} A deep copy of the provided object or array.
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*/
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function deepCopy(value) {
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return deepExtend(undefined, value);
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}
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exports.deepCopy = deepCopy;
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/**
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* Copies properties from source to target (recursively allows extension of objects and arrays).
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* Scalar values in the target are over-written. If target is undefined, an object of the
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* appropriate type will be created (and returned).
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*
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* We recursively copy all child properties of plain objects in the source - so that namespace-like
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* objects are merged.
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*
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* Note that the target can be a function, in which case the properties in the source object are
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* copied onto it as static properties of the function.
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*
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* @param {any} target The value which is being extended.
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* @param {any} source The value whose properties are extending the target.
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* @return {any} The target value.
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*/
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function deepExtend(target, source) {
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if (!(source instanceof Object)) {
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return source;
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}
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switch (source.constructor) {
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case Date:
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// Treat Dates like scalars; if the target date object had any child
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// properties - they will be lost!
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var dateValue = source;
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return new Date(dateValue.getTime());
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case Object:
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if (target === undefined) {
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target = {};
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}
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break;
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case Array:
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// Always copy the array source and overwrite the target.
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target = [];
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break;
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default:
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// Not a plain Object - treat it as a scalar.
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return source;
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}
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for (var prop in source) {
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if (!source.hasOwnProperty(prop)) {
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continue;
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}
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target[prop] = deepExtend(target[prop], source[prop]);
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}
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return target;
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}
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exports.deepExtend = deepExtend;
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