gulpfile.babel.js

import gulp from 'gulp'
import babel from 'gulp-babel'
import cached from 'gulp-cached'
import chmod from 'gulp-chmod'
import stylus from 'gulp-stylus'

gulp.task('js-bin', () =>
  gulp
    .src('./bin/*.js')
    .pipe(cached('bin'))
    .pipe(babel())
    .pipe(chmod(755))
    .pipe(gulp.dest('./dist/bin'))
)

gulp.task('js-client', () =>
  gulp
    .src('./assets/app.js')
    .pipe(babel())
    .pipe(cached('clientjs'))
    .pipe(gulp.dest('./dist/assets'))
)

gulp.task('stylus', () =>
  gulp.src('./assets/*.styl').pipe(stylus()).pipe(gulp.dest('./dist/assets'))
)

gulp.task('other-assets', () =>
  gulp.src('./assets/favicon.ico').pipe(gulp.dest('./dist/assets'))
)

gulp.task('watch-js', () => {
  gulp.watch('./bin/*.js', ['js-bin'])
  gulp.watch('./assets/*.js', ['js-client'])
})

gulp.task('watch-stylus', () => {
  gulp.watch('./assets/*.styl', ['stylus'])
})

gulp.task('watch', ['watch-js', 'watch-stylus'])
gulp.task('build', ['js-bin', 'js-client', 'stylus', 'other-assets'])

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