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stream: move duplicated code to an internal module
Create a utils module for isIterable(), isReadable(), and isStream(). PR-URL: #37508 Reviewed-By: Antoine du Hamel <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Darshan Sen <[email protected]> Reviewed-By: Robert Nagy <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,32 @@ | ||
'use strict'; | ||
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const { | ||
SymbolAsyncIterator, | ||
SymbolIterator, | ||
} = primordials; | ||
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function isReadable(obj) { | ||
return !!(obj && typeof obj.pipe === 'function'); | ||
} | ||
|
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function isWritable(obj) { | ||
return !!(obj && typeof obj.write === 'function'); | ||
} | ||
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function isStream(obj) { | ||
return isReadable(obj) || isWritable(obj); | ||
} | ||
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function isIterable(obj, isAsync) { | ||
if (!obj) return false; | ||
if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function'; | ||
if (isAsync === false) return typeof obj[SymbolIterator] === 'function'; | ||
return typeof obj[SymbolAsyncIterator] === 'function' || | ||
typeof obj[SymbolIterator] === 'function'; | ||
} | ||
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module.exports = { | ||
isIterable, | ||
isReadable, | ||
isStream, | ||
}; |
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