gulpfile.js

const gulp = require('gulp');
const babel = require('gulp-babel');
const through2 = require('through2');
const watch = require('gulp-watch');
const newer = require('gulp-newer');
const gutil = require('gulp-util');
const rimraf = require('rimraf');
const plumber = require('gulp-plumber');
const cleanEmptyModules = require('./utils/clean-empty-modules');

// for compilation
const source = './packages/*/src/**/*.js';
const dest = './packages';
const srcEx = new RegExp("(packages/[^/]+)/src/");
const libFragment = "$1/lib/";

// for cleaning
const libs = './packages/*/lib';

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

gulp.task('clean', function(cb) {
  rimraf.sync(libs, { glob: true });

  const out = cleanEmptyModules();

  if (out.removed.length > 0)
    gutil.log(gutil.colors.cyan('Empty Packages - REMOVED'));
  out.removed.forEach(mod => {
    gutil.log(gutil.colors.red(mod));
  });

  if (out.kept.length > 0)
    gutil.log(gutil.colors.cyan('Unstaged Empty Packages - NOT REMOVED'));
  out.kept.forEach(mod => {
    gutil.log(gutil.colors.yellow(mod));
  });

  cb();
});

gulp.task('build', function() {
  return gulp.src(source)
    .pipe(plumber())
    .pipe(through2.obj(function(file, enc, callback) {
      file._path = file.path;
      file.path = file.path.replace(srcEx, libFragment);
      callback(null, file);
    }))
    .pipe(newer(dest))
    .pipe(through2.obj(function(file, env, callback) {
      gutil.log('Compiling', gutil.colors.cyan(file._path));
      callback(null, file);
    }))
    .pipe(babel())
    .pipe(gulp.dest(dest));
});

/* eslint-disable no-unused-vars */
gulp.task('watch', ['build'] ,function(callback) {
  watch(source, function() {
    gulp.start('build');
  });
});
/* eslint-enable */


/**
 * Build for browser
 */
const browserify = require('browserify');
const babelify = require('babelify');
const vinylSource = require('vinyl-source-stream');
const vinylBuffer = require('vinyl-buffer');
const uglify = require('gulp-uglify');
const copy = require('gulp-copy');

gulp.task('browser', function() {
  const bundler = browserify('./utils/browser.js', {
    standalone: 'BabelMinify'
  }).transform(babelify, {
    presets: ['es2015']
  });

  return bundler.bundle()
    .pipe(vinylSource('babel-minify.js'))
    .pipe(vinylBuffer())
    .pipe(uglify())
    .pipe(gulp.dest('./build'));
});

gulp.task('gh-pages', ['browser'], function() {
  return gulp.src('build/*')
    .pipe(copy('../babel-minify-gh-pages/build', {
      prefix: 1
    }));
});