gulpfile.js

var gulp = require('gulp'),
  gulpWatch = require('gulp-watch'),
  del = require('del'),
  runSequence = require('run-sequence'),
  argv = process.argv;

var path = require('path');
var svgSprite = require('gulp-svg-sprite');

/**
 * Ionic hooks
 * Add ':before' or ':after' to any Ionic project command name to run the specified
 * tasks before or after the command.
 */
gulp.task('serve:before', ['watch']);
gulp.task('emulate:before', ['build']);
gulp.task('deploy:before', ['build']);
gulp.task('build:before', ['build']);

// we want to 'watch' when livereloading
var shouldWatch = argv.indexOf('-l') > -1 || argv.indexOf('--livereload') > -1;
gulp.task('run:before', [shouldWatch ? 'watch' : 'build']);

/**
 * Ionic Gulp tasks, for more information on each see
 * https://github.com/driftyco/ionic-gulp-tasks
 *
 * Using these will allow you to stay up to date if the default Ionic 2 build
 * changes, but you are of course welcome (and encouraged) to customize your
 * build however you see fit.
 */
var buildBrowserify = require('ionic-gulp-browserify-typescript');
var buildSass = require('ionic-gulp-sass-build');
var copyHTML = require('ionic-gulp-html-copy');
var copyFonts = require('ionic-gulp-fonts-copy');
var copyScripts = require('ionic-gulp-scripts-copy');

var isRelease = argv.indexOf('--release') > -1;

gulp.task('watch', ['clean'], function (done) {
  runSequence(
    ['sass', 'html', 'fonts', 'svg-font', 'scripts'],
    function () {
      gulpWatch('app/**/*.scss', function () {
        gulp.start('sass');
      });
      gulpWatch('app/**/*.html', function () {
        gulp.start('html');
      });
      buildBrowserify({watch: true}).on('end', done);
    }
  );
});

gulp.task('build', ['clean'], function (done) {
  runSequence(
    ['sass', 'html', 'fonts', 'svg-font', 'scripts'],
    function () {
      buildBrowserify({
        minify: isRelease,
        browserifyOptions: {
          debug: !isRelease
        },
        uglifyOptions: {
          mangle: false
        }
      }).on('end', done);
    }
  );
});

gulp.task('svg-font', function () {
  // Basic configuration example
  config = {
    mode: {
      css: {     // Activate the «css» mode
        bust: false,
        render: {
          css: true  // Activate CSS output (with default options)
        }
      },
      symbol: true      // Activate the «symbol» mode
    }
  };

  return gulp.src('growth-ui/*.svg', {cwd: './'})
    .pipe(svgSprite(config))
    .pipe(gulp.dest('www/build'));
});

gulp.task('sass', buildSass);
gulp.task('html', copyHTML);
gulp.task('fonts', copyFonts);
gulp.task('scripts', copyScripts);
gulp.task('clean', function () {
  return del('www/build');
});