Watching for changes in SFDX project

sfdx-watcher.js

const chokidar = require('chokidar');
const shell = require('shelljs')

chokidar
  .watch('./force-app')
  .on('change', onChange)

// On File Change
function onChange (path) {
  console.log('Updating ' + path + '...')

  shell.exec('sfdx force:source:push', () => {
    if (path.indexOf('Test.cls') !== -1) onUpsertTest(path)
  })
}

// On Test Change
function onUpsertTest(path) {
  let fileName = path.split('/')[4].split('.')[0]
  console.log('Running tests for ' + fileName + '...')
  shell.exec('sfdx force:apex:test:run --resultformat human --classnames ' + fileName)
}