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Diffstat (limited to 'middleware/node_modules/merge-descriptors/index.js')
-rw-r--r-- | middleware/node_modules/merge-descriptors/index.js | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/middleware/node_modules/merge-descriptors/index.js b/middleware/node_modules/merge-descriptors/index.js new file mode 100644 index 0000000..573b132 --- /dev/null +++ b/middleware/node_modules/merge-descriptors/index.js @@ -0,0 +1,60 @@ +/*! + * merge-descriptors + * Copyright(c) 2014 Jonathan Ong + * Copyright(c) 2015 Douglas Christopher Wilson + * MIT Licensed + */ + +'use strict' + +/** + * Module exports. + * @public + */ + +module.exports = merge + +/** + * Module variables. + * @private + */ + +var hasOwnProperty = Object.prototype.hasOwnProperty + +/** + * Merge the property descriptors of `src` into `dest` + * + * @param {object} dest Object to add descriptors to + * @param {object} src Object to clone descriptors from + * @param {boolean} [redefine=true] Redefine `dest` properties with `src` properties + * @returns {object} Reference to dest + * @public + */ + +function merge(dest, src, redefine) { + if (!dest) { + throw new TypeError('argument dest is required') + } + + if (!src) { + throw new TypeError('argument src is required') + } + + if (redefine === undefined) { + // Default to true + redefine = true + } + + Object.getOwnPropertyNames(src).forEach(function forEachOwnPropertyName(name) { + if (!redefine && hasOwnProperty.call(dest, name)) { + // Skip desriptor + return + } + + // Copy descriptor + var descriptor = Object.getOwnPropertyDescriptor(src, name) + Object.defineProperty(dest, name, descriptor) + }) + + return dest +} |