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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MAIN //
/**
* Tests if a value is Node stream-like.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating if a value is Node stream-like
*
* @example
* var transformStream = require( '@stdlib/streams/node/transform' );
*
* var stream = transformStream();
*
* var bool = isNodeStreamLike( stream );
* // returns true
*
* bool = isNodeStreamLike( {} );
* // returns false
*/
function isNodeStreamLike( value ) {
return (
// Must be an object:
value !== null &&
typeof value === 'object' &&
// Should be an event emitter:
typeof value.on === 'function' &&
typeof value.once === 'function' &&
typeof value.emit === 'function' &&
typeof value.addListener === 'function' &&
typeof value.removeListener === 'function' &&
typeof value.removeAllListeners === 'function' &&
// Should have a `pipe` method (Node streams inherit from `Stream`, including writable streams):
typeof value.pipe === 'function'
);
}
// EXPORTS //
module.exports = isNodeStreamLike;
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