| 1 | 'use strict';
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| 2 |
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| 3 | var isStream = module.exports = function (stream) {
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| 4 | return stream !== null && typeof stream === 'object' && typeof stream.pipe === 'function';
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| 5 | };
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| 6 |
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| 7 | isStream.writable = function (stream) {
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| 8 | return isStream(stream) && stream.writable !== false && typeof stream._write === 'function' && typeof stream._writableState === 'object';
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| 9 | };
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| 10 |
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| 11 | isStream.readable = function (stream) {
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| 12 | return isStream(stream) && stream.readable !== false && typeof stream._read === 'function' && typeof stream._readableState === 'object';
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| 13 | };
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| 14 |
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| 15 | isStream.duplex = function (stream) {
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| 16 | return isStream.writable(stream) && isStream.readable(stream);
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| 17 | };
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| 18 |
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| 19 | isStream.transform = function (stream) {
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| 20 | return isStream.duplex(stream) && typeof stream._transform === 'function' && typeof stream._transformState === 'object';
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| 21 | };
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