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'use strict';

const isStream = stream =>
	stream !== null &&
	typeof stream === 'object' &&
	typeof stream.pipe === 'function';

isStream.writable = stream =>
	isStream(stream) &&
	stream.writable !== false &&
	typeof stream._write === 'function' &&
	typeof stream._writableState === 'object';

isStream.readable = stream =>
	isStream(stream) &&
	stream.readable !== false &&
	typeof stream._read === 'function' &&
	typeof stream._readableState === 'object';

isStream.duplex = stream =>
	isStream.writable(stream) &&
	isStream.readable(stream);

isStream.transform = stream =>
	isStream.duplex(stream) &&
	typeof stream._transform === 'function';

module.exports = isStream;