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stream: fix Writable instanceof for subclasses #14945

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stream: fix Writable instanceof for subclasses #14945

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2 changes: 2 additions & 0 deletions lib/_stream_writable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,8 @@ if (typeof Symbol === 'function' && Symbol.hasInstance) {
value: function(object) {
if (realHasInstance.call(this, object))
return true;
if (this !== Writable)
return false;

return object && object._writableState instanceof WritableState;
}
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5 changes: 5 additions & 0 deletions test/parallel/test-stream-inheritance.js
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Expand Up @@ -56,3 +56,8 @@ common.expectsError(
message: 'undefined does not inherit from CustomWritable'
}
);

class OtherCustomWritable extends Writable {}

assert(!(new OtherCustomWritable() instanceof CustomWritable));
assert(!(new CustomWritable() instanceof OtherCustomWritable));