30 lines
746 B
JavaScript
30 lines
746 B
JavaScript
export function isStream(stream) {
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return stream !== null
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&& typeof stream === 'object'
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&& typeof stream.pipe === 'function';
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}
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export function isWritableStream(stream) {
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return isStream(stream)
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&& stream.writable !== false
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&& typeof stream._write === 'function'
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&& typeof stream._writableState === 'object';
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}
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export function isReadableStream(stream) {
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return isStream(stream)
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&& stream.readable !== false
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&& typeof stream._read === 'function'
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&& typeof stream._readableState === 'object';
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}
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export function isDuplexStream(stream) {
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return isWritableStream(stream)
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&& isReadableStream(stream);
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}
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export function isTransformStream(stream) {
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return isDuplexStream(stream)
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&& typeof stream._transform === 'function';
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}
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