Gulp file for Basic Babel (6to5) transpilation

gulpfile.js

"use strict";

var gulp = require('gulp'),
    babel = require('gulp-babel'),
    watch = require('gulp-watch'),
    plumber = require('gulp-plumber'),

path = {
    src: {
        js: 'src/*.js'
    },
    dist: {
        js: "dist/"
    }
};

gulp.task('6to5', function () {
    gulp.src(path.src.js)
        .pipe(plumber())
        .pipe(babel())
        .pipe(plumber.stop())
        .pipe(gulp.dest(path.dist.js));
});

gulp.task('watch', ['6to5'], function (){
    gulp.watch([path.src.js], [babel]);
});

gulp.task('default', ['watch']);

Install with:

npm install --save-dev gulp gulp-watch gulp-babel gulp-plumber

npm install --save-dev gulp gulp-watch gulp-babel gulp-plumber
watch = require('gulp-watch'),

Actually, gulp-watch is not used. To use it you need

.src(files).pipe(watch(files))

... instead of gulp.watch

It's 100 times faster than built-in gulp.watch on OS X, but you also need npm install fsevents. With that passive CPU usage goes from 10-50% to 0%.