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21 lines
800 B
21 lines
800 B
'use strict';
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var isStream = module.exports = function (stream) {
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return stream !== null && typeof stream === 'object' && typeof stream.pipe === 'function';
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};
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isStream.writable = function (stream) {
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return isStream(stream) && stream.writable !== false && typeof stream._write === 'function' && typeof stream._writableState === 'object';
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};
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isStream.readable = function (stream) {
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return isStream(stream) && stream.readable !== false && typeof stream._read === 'function' && typeof stream._readableState === 'object';
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};
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isStream.duplex = function (stream) {
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return isStream.writable(stream) && isStream.readable(stream);
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};
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isStream.transform = function (stream) {
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return isStream.duplex(stream) && typeof stream._transform === 'function' && typeof stream._transformState === 'object';
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};
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