Checks if the given argument is a duplex (readable and writable) stream.
Check if the value is different from null
, use typeof
to check if a value is of type object
and the pipe
property is of type function
.
Additionally check if the typeof
the _read
, _write
and _readableState
, _writableState
properties are function
and object
respectively.
代码片段
const isDuplexStream = val =>
val !== null &&
typeof val === 'object' &&
typeof val.pipe === 'function' &&
typeof val._read === 'function' &&
typeof val._readableState === 'object' &&
typeof val._write === 'function' &&
typeof val._writableState === 'object';
使用样例
const Stream = require('stream');
isDuplexStream(new Stream.Duplex()); // true