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on this file since 84d0fbb was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | /*!
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| 2 | * merge-descriptors
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| 3 | * Copyright(c) 2014 Jonathan Ong
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| 4 | * Copyright(c) 2015 Douglas Christopher Wilson
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| 5 | * MIT Licensed
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| 6 | */
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| 7 |
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| 8 | 'use strict'
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| 9 |
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| 10 | /**
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| 11 | * Module exports.
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| 12 | * @public
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| 13 | */
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| 14 |
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| 15 | module.exports = merge
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| 16 |
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| 17 | /**
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| 18 | * Module variables.
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| 19 | * @private
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| 20 | */
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| 21 |
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| 22 | var hasOwnProperty = Object.prototype.hasOwnProperty
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| 23 |
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| 24 | /**
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| 25 | * Merge the property descriptors of `src` into `dest`
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| 26 | *
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| 27 | * @param {object} dest Object to add descriptors to
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| 28 | * @param {object} src Object to clone descriptors from
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| 29 | * @param {boolean} [redefine=true] Redefine `dest` properties with `src` properties
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| 30 | * @returns {object} Reference to dest
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| 31 | * @public
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| 32 | */
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| 33 |
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| 34 | function merge(dest, src, redefine) {
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| 35 | if (!dest) {
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| 36 | throw new TypeError('argument dest is required')
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| 37 | }
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| 38 |
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| 39 | if (!src) {
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| 40 | throw new TypeError('argument src is required')
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| 41 | }
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| 42 |
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| 43 | if (redefine === undefined) {
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| 44 | // Default to true
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| 45 | redefine = true
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| 46 | }
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| 47 |
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| 48 | Object.getOwnPropertyNames(src).forEach(function forEachOwnPropertyName(name) {
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| 49 | if (!redefine && hasOwnProperty.call(dest, name)) {
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| 50 | // Skip desriptor
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| 51 | return
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| 52 | }
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| 53 |
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| 54 | // Copy descriptor
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| 55 | var descriptor = Object.getOwnPropertyDescriptor(src, name)
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| 56 | Object.defineProperty(dest, name, descriptor)
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| 57 | })
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| 58 |
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| 59 | return dest
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| 60 | }
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