ESLint New/Changed Files (Gulp Task)

lint.js

'use strict'

const spawn = require('cross-spawn')
const byline = require('byline')
const gulp = require('gulp')
const eslint = require('gulp-eslint')

module.exports = (done) => {
  const diff = spawn('git', ['--no-pager', 'diff', '--cached', '--name-only', '*.js'])
  const scripts = []

  diff.stdout
    .pipe(byline.createStream())
    .on('data', (buffer) => scripts.push('./' + buffer.toString()))
    .on('end', () =>
      gulp.src(scripts)
        .pipe(eslint())
        .pipe(eslint.format())
        .pipe(eslint.failAfterError())
        .on('end', done))
}