record2.js

// Imports modules.
const fs = require(`fs`),
	path = require(`path`);
const AudioRecorder = require('node-audiorecorder');
// Constants.
const DIRECTORY = `examples-recordings`;

// Initialize recorder and file stream.
const audioRecorder = new AudioRecorder({
	program: process.platform === `win32` ? `sox` : `rec`,
	silence: 0
}, console);

// Create path to write recordings to.
if (!fs.existsSync(DIRECTORY)){
	fs.mkdirSync(DIRECTORY);
}
// Create file path with random name.
const fileName = path.join(DIRECTORY, Math.random().toString(36).replace(/[^a-z]+/g, ``).substr(0, 4).concat(`.wav`));
console.log(`Writing new recording file at: `, fileName);

// Create write stream.
const fileStream = fs.createWriteStream(fileName, { encoding: `binary` });
// Start and write to the file.
audioRecorder.start().stream().pipe(fileStream);

// Log information on the following events
audioRecorder.stream().on(`close`, function(code) {
	console.warn(`Recording closed. Exit code: `, code);
});
audioRecorder.stream().on(`end`, function() {
	console.warn(`Recording ended.`);
});
audioRecorder.stream().on(`error`, function() {
	console.warn(`Recording error.`);
});
// Write incoming data out the console.
/*audioRecorder.stream().on(`data`, function(chunk) {
	console.log(chunk);
});*/

// Keep process alive.
process.stdin.resume();
console.warn(`Press ctrl+c to exit.`);