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stream: proper instanceof for Writables #8834

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stream: proper instanceof for Writables #8834

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026c95a
stream: proper `instanceof` for `Writable`s
addaleax Sep 28, 2016
a21153d
[squash] fix typo
addaleax Sep 28, 2016
35c92b9
[squash] by → due to
addaleax Sep 28, 2016
297b6fd
[squash] feature-detect `Symbol`
addaleax Sep 29, 2016
de72676
[squash] more comments!
addaleax Sep 29, 2016
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[squash] feature-detect Symbol
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@addaleax
addaleax committed Sep 29, 2016
commit 297b6fd353d6c51fb50af65170f4b76c8b2a4ecf
2 changes: 1 addition & 1 deletion lib/_stream_writable.js
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Expand Up @@ -137,7 +137,7 @@ Object.defineProperty(WritableState.prototype, 'buffer', {
// Test _writableState for inheritance to account for Duplex streams,
// whose prototype chain only points to Readable.
var realHasInstance;
if (Symbol.hasInstance) {
if (typeof Symbol === 'function' && Symbol.hasInstance) {
realHasInstance = Function.prototype[Symbol.hasInstance];
Object.defineProperty(Writable, Symbol.hasInstance, {
value: function(object) {
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