'use strict';
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const isStream = stream =>
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stream !== null &&
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typeof stream === 'object' &&
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typeof stream.pipe === 'function';
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isStream.writable = stream =>
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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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isStream.readable = stream =>
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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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isStream.duplex = stream =>
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isStream.writable(stream) &&
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isStream.readable(stream);
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isStream.transform = stream =>
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isStream.duplex(stream) &&
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typeof stream._transform === 'function';
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module.exports = isStream;
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