gulpfile.js

const gulp = require('gulp');
const less = require('gulp-less');
const babel = require('gulp-babel');
const path = require('path');
const Rsync = require('rsync');
const pkg = require('./package.json');
const mkdirp = require('mkdirp');
const webpack = require('gulp-webpack');

const syncDestinations = [
  '../thor/node_modules/' + pkg.name
];

const exclude = [
  'src',
  'gulpfile.js',
  'node_modules',
  '.eslintrc',
  '.git'
];

Object.keys(pkg.devDependencies).forEach((name) => {
  exclude.push(path.join('node_modules', name));
});

Object.keys(pkg.peerDependencies).forEach((name) => {
  exclude.push(path.join('node_modules', name));
});

function syncPluginTo(excludeFiles) {
  return function (dest) {
    return new Promise((resolve, reject) => {
      mkdirp(dest, function (err) {
        if (err) return reject(err);

        const source = path.resolve(__dirname) + '/';
        const rsync = new Rsync();

        rsync.source(source)
          .destination(dest)
          .flags('uav')
          .recursive(true)
          .set('delete')
          .exclude(excludeFiles)
          .output(function (data) {
            process.stdout.write(data.toString('utf8'));
          });

        rsync.execute(function (err) {
          if (err) {
            console.log(err);
            return reject(err);
          }
          resolve();
        });
      });
    });
  };
}

gulp.task('sync', function (done) {
  Promise.all(syncDestinations.map(syncPluginTo(exclude)))
    .then(() => done())
    .catch(done);
});

gulp.task('js', () => {
  return gulp.src('src/**/*.js')
  .pipe(babel({
    presets: ['react', 'es2015-loose', 'stage-1'],
    plugins: ['add-module-exports', 'dev-expression']
  })).pipe(gulp.dest('dist'));
});

gulp.task('less', () => {
  const options = {
    paths: [ path.join(__dirname, 'less', 'includes') ]
  };
  return gulp.src('./src/less/main.less')
    .pipe(less())
    .pipe(gulp.dest('./css'));
});

gulp.task('build', ['js', 'less']);

gulp.task('dev', ['build', 'sync'], () => {
  gulp.watch('src/lib/**/*.js', ['js']);
  gulp.watch('src/less/**/*.less', ['less']);
  gulp.watch(['package.json', 'dist/**/*', 'css/**/*'], ['sync']);
});

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