Webpack (#1367)

* Replace gulp with webpack and npm scripts for JS compilation
* Set up Travis CI to commit compiled JS
* Restructure `js` directory; only one instance of npm, forum/admin are "submodules"
* Refactor JS initializers into Application subclasses
* Maintain partial compatibility API (importing from absolute paths) for extensions
* Remove minification responsibility from PHP asset compiler
* Restructure `less` directory

src/Frontend/Asset/JsCompiler.php

@@ -11,11 +11,7 @@
 
 namespace Flarum\Frontend\Asset;
 
-use Exception;
 use Illuminate\Cache\Repository;
-use MatthiasMullie\Minify;
-use s9e\TextFormatter\Configurator;
-use s9e\TextFormatter\Configurator\JavaScript\Minifiers\FirstAvailable;
 
 class JsCompiler extends RevisionCompiler
 {
@@ -42,14 +38,6 @@ class JsCompiler extends RevisionCompiler
      */
     protected function format($string)
     {
-        if (! $this->watch) {
-            $key = 'js.'.sha1($string);
-
-            $string = $this->cache->rememberForever($key, function () use ($string) {
-                return $this->minify($string);
-            });
-        }
-
         return $string.";\n";
     }
 
@@ -60,59 +48,4 @@ class JsCompiler extends RevisionCompiler
     {
         return $this->watch;
     }
-
-    /**
-     * @param string $source
-     * @return string
-     */
-    protected function minify($source)
-    {
-        set_time_limit(60);
-
-        try {
-            $source = $this->minifyWithClosureCompilerService($source);
-        } catch (Exception $e) {
-            $source = $this->minifyWithFallback($source);
-        }
-
-        return $source;
-    }
-
-    /**
-     * @param string $source
-     * @return string
-     */
-    protected function minifyWithClosureCompilerService($source)
-    {
-        // The minifier may need some classes bundled with the Configurator so we autoload it
-        class_exists(Configurator::class);
-
-        $minifier = new FirstAvailable;
-
-        $remoteCache = $minifier->add('RemoteCache');
-        $remoteCache->url = 'http://s9e-textformatter.rhcloud.com/flarum-minifier/';
-
-        $hostedMinifer = $minifier->add('HostedMinifier');
-        $hostedMinifer->url = 'http://s9e-textformatter.rhcloud.com/flarum-minifier/';
-        $hostedMinifer->httpClient->timeout = 30;
-
-        $ccs = $minifier->add('ClosureCompilerService');
-        $ccs->compilationLevel = 'SIMPLE_OPTIMIZATIONS';
-        $ccs->httpClient->timeout = 30;
-
-        $minifier->add('MatthiasMullieMinify');
-
-        return $minifier->minify($source);
-    }
-
-    /**
-     * @param string $source
-     * @return string
-     */
-    protected function minifyWithFallback($source)
-    {
-        $minifier = new Minify\JS($source);
-
-        return $minifier->minify();
-    }
 }