Gulpfile.js

var gulp = require('gulp'),
    bower = require('main-bower-files'),
    bowerNormalize = require('gulp-bower-normalize'),
    tsc = require('gulp-typescript'),
    concat = require('gulp-concat'),
    karma = require('karma'),
    runSequence = require('run-sequence'),
    ngAnnotate = require('gulp-ng-annotate'),
    uglify = require('gulp-uglify'),
    rename = require('gulp-rename'),
    sourcemaps = require('gulp-sourcemaps');

// This compiles the server typescript
gulp.task('server', function () {
  var tsResult = gulp.src('serverSrc/*.ts')
      .pipe(tsc({
        definitionFiles: false,
        module: 'commonjs',
        target: 'ES5'
      }));
  return tsResult.js.pipe(gulp.dest('.'));
});

// This copies files from bower_components into the public folder
gulp.task('bower', function () {
  return gulp.src(bower(), {base: './bower_components'})
      .pipe(bowerNormalize({flatten: true}))
      .pipe(gulp.dest('./public/vendor/'));
});

var sources = {
  typescript: ["typings/**/*.d.ts", "src/**/*.ts"],
  html: ['src/**/*.html'],
  css: ['src/css/**/*.css'],
  test: ['public/**/*.js', 'test/**/*Spec.js']
};

// Compile the app
gulp.task('typescript', function () {
  return gulp.src(sources.typescript)
      .pipe(sourcemaps.init())
      .pipe(tsc({
        noExternalResolve: true,
        sortOutput: true,
        target: 'ES5'
      }))
      .pipe(concat('app.js'))
      .pipe(gulp.dest('public/js'))
      .pipe(ngAnnotate())
      .pipe(uglify())
      .pipe(sourcemaps.write())
      .pipe(rename('app.min.js'))
      .pipe(gulp.dest('public/js'));
});

// Copy html from the src to the public directory
gulp.task('html', function () {
  return gulp.src(sources.html)
      .pipe(gulp.dest('public'));
});

// Copy CSS from the src/css to the public/css directory
gulp.task('css', function () {
  return gulp.src(sources.css)
      .pipe(gulp.dest('public/css'));
});

// Run tests
gulp.task('test', function (done) {
  karma.server.start({
    configFile: __dirname + '/karma.conf.js',
    singleRun: true
  }, function () {
    done();
  });
});

gulp.task('default', ['typescript', 'html', 'css']);

// Uses run-sequence to run default build tasks, then test
gulp.task('pre-watch', function (done) {
  runSequence(
      ['bower', 'default'],
      'test',
      done
  );
});

// Start watch
gulp.task('watch', ['pre-watch'], function () {
  gulp.watch(sources.typescript, ['typescript']);
  gulp.watch(sources.html, ['html']);
  gulp.watch(sources.css, ['css']);
  gulp.watch(sources.test, ['test']);
});