tra-analysis/website/functions/node_modules/firebase-admin/lib/utils/deep-copy.js
2019-01-06 13:14:45 -06:00

76 lines
2.6 KiB
JavaScript

/*! firebase-admin v6.0.0 */
"use strict";
/*!
* Copyright 2017 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
/**
* Returns a deep copy of an object or array.
*
* @param {object|array} value The object or array to deep copy.
* @return {object|array} A deep copy of the provided object or array.
*/
function deepCopy(value) {
return deepExtend(undefined, value);
}
exports.deepCopy = deepCopy;
/**
* Copies properties from source to target (recursively allows extension of objects and arrays).
* Scalar values in the target are over-written. If target is undefined, an object of the
* appropriate type will be created (and returned).
*
* We recursively copy all child properties of plain objects in the source - so that namespace-like
* objects are merged.
*
* Note that the target can be a function, in which case the properties in the source object are
* copied onto it as static properties of the function.
*
* @param {any} target The value which is being extended.
* @param {any} source The value whose properties are extending the target.
* @return {any} The target value.
*/
function deepExtend(target, source) {
if (!(source instanceof Object)) {
return source;
}
switch (source.constructor) {
case Date:
// Treat Dates like scalars; if the target date object had any child
// properties - they will be lost!
var dateValue = source;
return new Date(dateValue.getTime());
case Object:
if (target === undefined) {
target = {};
}
break;
case Array:
// Always copy the array source and overwrite the target.
target = [];
break;
default:
// Not a plain Object - treat it as a scalar.
return source;
}
for (var prop in source) {
if (!source.hasOwnProperty(prop)) {
continue;
}
target[prop] = deepExtend(target[prop], source[prop]);
}
return target;
}
exports.deepExtend = deepExtend;