gulpfile.js

var gulp = require('gulp');
var packageJSON = require('./package.json');
var plugins = require('gulp-load-plugins')();

var buildConfig = {
  fileName: packageJSON.name,
  src: ['./src/!(*.spec).js'],
  dest: './',
};

gulp.task('compile-ugly', compileUgly);
gulp.task('compile-file', compile);
gulp.task('compile', gulp.series(
  'compile-ugly',
  'compile-file'
));

function compile() {
  return gulp.src(buildConfig.src)
    .pipe(plugins.eslint())
    .pipe(plugins.eslint.format())
    .pipe(plugins.babel({
      presets: ['es2015'],
      plugins: ['transform-object-assign'],
    }))
    .pipe(plugins.ngAnnotate())
    .pipe(plugins.concat(buildConfig.fileName + '.js'))
    .pipe(gulp.dest(buildConfig.dest));
}

function compileUgly() {
  return gulp.src(buildConfig.src)
    .pipe(plugins.babel({
      presets: ['es2015'],
      plugins: ['transform-object-assign'],
    }))
    .pipe(plugins.ngAnnotate())
    .pipe(plugins.uglify())
    .pipe(plugins.concat(buildConfig.fileName + '.min.js'))
    .pipe(gulp.dest(buildConfig.dest));
}