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