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| author | nanalelfe <nargiza.nosirova@mail.utoronto.ca> | 2016-07-18 10:54:08 +0000 |
|---|---|---|
| committer | nanalelfe <nargiza.nosirova@mail.utoronto.ca> | 2016-07-18 10:54:08 +0000 |
| commit | a35da9f9ccc1124d9b6f4461c7216ffbb0285e2f (patch) | |
| tree | d5b4b8548caae36a20e1258a8341dab4b3d522d2 /node_modules/object-assign/index.js | |
| parent | 16bbc66ebafc6f1a55e47dbda3f3c0f658fe715c (diff) | |
| parent | c1ce89359a7b54ec97b54ce577e5534c180c5c4b (diff) | |
merged
Diffstat (limited to 'node_modules/object-assign/index.js')
| -rw-r--r-- | node_modules/object-assign/index.js | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/node_modules/object-assign/index.js b/node_modules/object-assign/index.js new file mode 100644 index 0000000..5085048 --- /dev/null +++ b/node_modules/object-assign/index.js @@ -0,0 +1,83 @@ +'use strict'; +/* eslint-disable no-unused-vars */ +var hasOwnProperty = Object.prototype.hasOwnProperty; +var propIsEnumerable = Object.prototype.propertyIsEnumerable; + +function toObject(val) { + if (val === null || val === undefined) { + throw new TypeError('Object.assign cannot be called with null or undefined'); + } + + return Object(val); +} + +function shouldUseNative() { + try { + if (!Object.assign) { + return false; + } + + // Detect buggy property enumeration order in older V8 versions. + + // https://bugs.chromium.org/p/v8/issues/detail?id=4118 + var test1 = new String('abc'); // eslint-disable-line + test1[5] = 'de'; + if (Object.getOwnPropertyNames(test1)[0] === '5') { + return false; + } + + // https://bugs.chromium.org/p/v8/issues/detail?id=3056 + var test2 = {}; + for (var i = 0; i < 10; i++) { + test2['_' + String.fromCharCode(i)] = i; + } + var order2 = Object.getOwnPropertyNames(test2).map(function (n) { + return test2[n]; + }); + if (order2.join('') !== '0123456789') { + return false; + } + + // https://bugs.chromium.org/p/v8/issues/detail?id=3056 + var test3 = {}; + 'abcdefghijklmnopqrst'.split('').forEach(function (letter) { + test3[letter] = letter; + }); + if (Object.keys(Object.assign({}, test3)).join('') !== + 'abcdefghijklmnopqrst') { + return false; + } + + return true; + } catch (e) { + // We don't expect any of the above to throw, but better to be safe. + return false; + } +} + +module.exports = shouldUseNative() ? Object.assign : function (target, source) { + var from; + var to = toObject(target); + var symbols; + + for (var s = 1; s < arguments.length; s++) { + from = Object(arguments[s]); + + for (var key in from) { + if (hasOwnProperty.call(from, key)) { + to[key] = from[key]; + } + } + + if (Object.getOwnPropertySymbols) { + symbols = Object.getOwnPropertySymbols(from); + for (var i = 0; i < symbols.length; i++) { + if (propIsEnumerable.call(from, symbols[i])) { + to[symbols[i]] = from[symbols[i]]; + } + } + } + } + + return to; +}; |
