import gulp from 'gulp'; import eslint from 'gulp-eslint'; gulp.task('lint', () => { return gulp.src(['**/*.js', '!node_modules/**', '!app/node_modules/**', '!app/lib/**', '!lib/**', '!built-tests/**', '!coverage/**']) .pipe(eslint()) .pipe(eslint.format()) .pipe(eslint.failAfterError()); });