Improve spread helper emit #12304
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Improve spread helper emit #12304
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Since __assign defaults to Object.assign if present, our own helper will never be used in ES6 and higher, and `getOwnPropertySymbols` is not needed in ES5 and below because symbols don't exist there.
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@rbuckton here's the __assign improvement you suggested. |
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Sure. Done. |
rbuckton
approved these changes
Nov 16, 2016
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The premise is not strictly true. Object.assign and Object.getOwnPropertySymbols may be polyfilled (one of them or both). It's safer to feature-detect each on separately, rather than rely on presence of one as a clue to another. |
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Since
__assigndefaults toObject.assignif present, our own helper will never be used in ES6 and higher, andgetOwnPropertySymbolsis not needed in ES5 and below because symbols don't exist there.