readline-transform

Transform stream to read line-by-line and write a string

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readline-transform
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Readme

ReadlineTransform
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Reading String or Buffer content from a Readable stream and writing each line which ends without line break as object

Install

$ npm install -save readline-transform

How to Use

Create a ReadlineTransform

new ReadlineTransform(options)
  • options <Object>
breakMatcher is the regular expression to split content by line break for str.split(). (default: /\r?\n/) ignoreEndOfBreak is boolean. if content ends with line break, ignore last empty line. (default: true) skipEmpty is boolean. if line is empty string, skip it (default: false)

An example

const { PassThrough } = require('stream');
const ReadlineTransform = require('readline-transform');

const readStream = new PassThrough();
const transform = new ReadlineTransform({ skipEmpty: true });
const writeStream = new PassThrough({ objectMode: true });

writeStream.on('data', (line) => {
  console.log(line);
}).on('finish', () => {
  console.log('<<< all done >>>');
});

readStream.pipe(transform).pipe(writeStream);

readStream.write(new Buffer('foo\nba'));
readStream.write(new Buffer('r\r\n\n\r'));
readStream.end(new Buffer('\nbaz'));

Console output

$ node example.js
foo
bar
baz
<<< all done >>>