/**

* @license

* Copyright (c) 2016 The Polymer Project Authors. All rights reserved.

* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt

* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt

* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt

* Code distributed by Google as part of the polymer project is also

* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt

*/

'use strict';

const compilerPackage = require('google-closure-compiler');

const gulp = require('gulp');

const sourcemaps = require('gulp-sourcemaps');

const closureCompiler = compilerPackage.gulp();

gulp.task('default', () => {

return gulp.src('./src/**/*.js', {base: './'})

.pipe(sourcemaps.init())

.pipe(closureCompiler({

compilation_level: 'ADVANCED',

warning_level: 'VERBOSE',

language_in: 'ECMASCRIPT6_STRICT',

language_out: 'ECMASCRIPT5_STRICT',

externs: ['externs/custom-elements.js'],

dependency_mode: 'STRICT',

entry_point: ['/src/custom-elements'],

js_output_file: 'custom-elements.min.js',

output_wrapper: '(function(){\n%output%\n}).call(self);',

assume_function_wrapper: true,

new_type_inf: true,

rewrite_polyfills: false,

}))

.pipe(sourcemaps.write('/'))

.pipe(gulp.dest('./'));

});