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Diffstat (limited to 'node_modules/extend/index.js')
-rw-r--r-- | node_modules/extend/index.js | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/node_modules/extend/index.js b/node_modules/extend/index.js new file mode 100644 index 000000000..f5ec75d52 --- /dev/null +++ b/node_modules/extend/index.js @@ -0,0 +1,86 @@ +'use strict'; + +var hasOwn = Object.prototype.hasOwnProperty; +var toStr = Object.prototype.toString; + +var isArray = function isArray(arr) { + if (typeof Array.isArray === 'function') { + return Array.isArray(arr); + } + + return toStr.call(arr) === '[object Array]'; +}; + +var isPlainObject = function isPlainObject(obj) { + if (!obj || toStr.call(obj) !== '[object Object]') { + return false; + } + + var hasOwnConstructor = hasOwn.call(obj, 'constructor'); + var hasIsPrototypeOf = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, 'isPrototypeOf'); + // Not own constructor property must be Object + if (obj.constructor && !hasOwnConstructor && !hasIsPrototypeOf) { + return false; + } + + // Own properties are enumerated firstly, so to speed up, + // if last one is own, then all properties are own. + var key; + for (key in obj) {/**/} + + return typeof key === 'undefined' || hasOwn.call(obj, key); +}; + +module.exports = function extend() { + var options, name, src, copy, copyIsArray, clone, + target = arguments[0], + i = 1, + length = arguments.length, + deep = false; + + // Handle a deep copy situation + if (typeof target === 'boolean') { + deep = target; + target = arguments[1] || {}; + // skip the boolean and the target + i = 2; + } else if ((typeof target !== 'object' && typeof target !== 'function') || target == null) { + target = {}; + } + + for (; i < length; ++i) { + options = arguments[i]; + // Only deal with non-null/undefined values + if (options != null) { + // Extend the base object + for (name in options) { + src = target[name]; + copy = options[name]; + + // Prevent never-ending loop + if (target !== copy) { + // Recurse if we're merging plain objects or arrays + if (deep && copy && (isPlainObject(copy) || (copyIsArray = isArray(copy)))) { + if (copyIsArray) { + copyIsArray = false; + clone = src && isArray(src) ? src : []; + } else { + clone = src && isPlainObject(src) ? src : {}; + } + + // Never move original objects, clone them + target[name] = extend(deep, clone, copy); + + // Don't bring in undefined values + } else if (typeof copy !== 'undefined') { + target[name] = copy; + } + } + } + } + } + + // Return the modified object + return target; +}; + |