tonysm · tonysm · Jan 6, 2024 · Jan 6, 2024 · Jan 6, 2024 · Jan 6, 2024
diff --git a/README.md b/README.md
@@ -45,15 +45,15 @@ php artisan importmap:install
 Next, we need to add the following component to our view or layout file:
 
 ```blade
-<x-importmap-tags />
+<x-importmap::tags />
 ```
 
 Add that between your `<head>` tags. The `entrypoint` should be the "main" file, commonly the `resources/js/app.js` file, which will be mapped to the `app` module (use the module name, not the file).
 
-By default the `x-importmap-tags` component assumes your entrypoint module is `app`, which matches the existing `resources/js/app.js` file from Laravel's default scaffolding. You may want to customize the entrypoint, which you can do with the `entrypoint` prop:
+By default the `x-importmap::tags` component assumes your entrypoint module is `app`, which matches the existing `resources/js/app.js` file from Laravel's default scaffolding. You may want to customize the entrypoint, which you can do with the `entrypoint` prop:
 
 ```blade
-<x-importmap-tags entrypoint="admin" />
+<x-importmap::tags entrypoint="admin" />
 ```
 
 The package will automatically map the `resources/js` folder to your `public/js` folder using Laravel's symlink feature. All you have to do after installing the package is run:
@@ -173,7 +173,7 @@ The version is added as a comment to your pin so you know which version was impo
 
 ### Preloading Modules
 
-To avoid the waterfall effect where the browser has to load one file after another before it can get to the deepest nested import, we support [modulepreload links](https://developers.google.com/web/updates/2017/12/modulepreload). Pinned modules can be preloaded by appending `preload: true` to the pin, like so:
+To avoid the waterfall effect where the browser has to load one file after another before it can get to the deepest nested import, we use [modulepreload links](https://developers.google.com/web/updates/2017/12/modulepreload) by default. If you don't want to preload a dependency, because you want to load it on-demand for efficiency, append `preload: false` to the pin.
 
 ```php
 Importmap::pinAllFrom("resources/js/", to: "js/", preload: true);
@@ -186,6 +186,9 @@ Which will add the correct `links` tags to your head tag in the HTML document, l
 <link rel="modulepreload" href="https://unpkg.com/[email protected]/dist/module.esm.js">
 ```
 
+You may add the `AddLinkHeadersForPreloadedPins` middleware to the `web` routes group so these preloaded links are sent as a `Link` header.
+Add the `Tonysm\ImportmapLaravel\Http\Middleware\AddLinkHeadersForPreloadedPins` to the `web` route group so the preloaded modules are sent as the Link headers, which are used in [HTTP/2 Server Push](https://datatracker.ietf.org/doc/html/rfc7540#section-8.2) and [Resource Hints](https://html.spec.whatwg.org/#linkTypes) to push resources to the client as early as possible. Some web servers can pick up this `Link` header and convert them to [Early Hints](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103) responses.
+
 ## Dependency Maintenance Commands
 
 Maintaining a healthy dependency list can be tricky. Here are a couple of commands to help you with this task.

diff --git a/resources/views/tags.blade.php → resources/views/components/tags.blade.php b/resources/views/tags.blade.php → resources/views/components/tags.blade.php
@@ -1,3 +1,12 @@
+@props(['entrypoint' => 'app', 'nonce' => null, 'importmap' => null])
+
+@php
+    $resolver = new \Tonysm\ImportmapLaravel\AssetResolver();
+
+    $importmaps = $importmap?->asArray($resolver) ?? \Tonysm\ImportmapLaravel\Facades\Importmap::asArray($resolver);
+    $preloadedModules = $importmap?->preloadedModulePaths($resolver) ?? \Tonysm\ImportmapLaravel\Facades\Importmap::preloadedModulePaths($resolver);
+@endphp
+
 <script type="importmap" data-turbo-track="reload"@if ($nonce) nonce="{{ $nonce }}" @endif>
     @json($importmaps, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES)
 </script>

diff --git a/src/Commands/InstallCommand.php b/src/Commands/InstallCommand.php
@@ -63,7 +63,7 @@ private function deleteNpmRelatedFiles(): void
     private function publishImportmapFile(): void
     {
         $this->displayTask('publishing the `routes/importmap.php` file', function () {
-            File::copy(dirname(__DIR__, 2).join(DIRECTORY_SEPARATOR, ['', 'stubs', 'routes', 'importmap.php']), base_path(join(DIRECTORY_SEPARATOR, ['routes', 'importmap.php'])));
+            File::copy(dirname(__DIR__, 2).implode(DIRECTORY_SEPARATOR, ['', 'stubs', 'routes', 'importmap.php']), base_path(implode(DIRECTORY_SEPARATOR, ['routes', 'importmap.php'])));
 
             return self::SUCCESS;
         });
@@ -140,7 +140,7 @@ private function updateAppLayoutsUsingMix()
                     $file,
                     str_replace(
                         "<script src=\"{{ mix('js/app.js') }}\" defer></script>",
-                        '<x-importmap-tags />',
+                        '<x-importmap::tags />',
                         File::get($file),
                     ),
                 ));
@@ -157,7 +157,7 @@ private function updateAppLayoutsUsingVite()
                     $file,
                     preg_replace(
                         '/\@vite.*/',
-                        '<x-importmap-tags />',
+                        '<x-importmap::tags />',
                         File::get($file),
                     ),
                 ))
@@ -182,7 +182,7 @@ private function appendImportmapTagsToLayoutsHead(): void
                     $file,
                     preg_replace(
                         '/(\s*)(<\/head>)/',
-                        "\\1    <x-importmap-tags />\n\\1\\2",
+                        "\\1    <x-importmap::tags />\n\\1\\2",
                         File::get($file),
                     ),
                 ));

diff --git a/src/Http/Middleware/AddLinkHeadersForPreloadedPins.php b/src/Http/Middleware/AddLinkHeadersForPreloadedPins.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Tonysm\ImportmapLaravel\Http\Middleware;
+
+use Tonysm\ImportmapLaravel\AssetResolver;
+use Tonysm\ImportmapLaravel\Facades\Importmap;
+
+class AddLinkHeadersForPreloadedPins
+{
+    public function __construct(private AssetResolver $assetsResolver = new AssetResolver())
+    {
+    }
+
+    /**
+     * Sets the Link header for preloaded pins.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return \Illuminate\Http\Response
+     */
+    public function handle($request, $next)
+    {
+        return tap($next($request), function ($response) {
+            if ($preloaded = Importmap::preloadedModulePaths($this->assetsResolver)) {
+                $response->header('Link', collect($preloaded)
+                    ->map(fn ($url) => "<{$url}>; rel=\"modulepreload\"")
+                    ->join(', '));
+            }
+        });
+    }
+}
diff --git a/src/Importmap.php b/src/Importmap.php
@@ -20,12 +20,12 @@ public function __construct(public ?string $rootPath = null)
         $this->directories = collect();
     }
 
-    public function pin(string $name, string $to = null, bool $preload = false)
+    public function pin(string $name, ?string $to = null, bool $preload = true)
     {
         $this->packages->add(new MappedFile($name, path: $to ?: "js/{$name}.js", preload: $preload));
     }
 
-    public function pinAllFrom(string $dir, string $under = null, string $to = null, bool $preload = false)
+    public function pinAllFrom(string $dir, ?string $under = null, ?string $to = null, bool $preload = true)
     {
         $this->directories->add(new MappedDirectory($dir, $under, $to, $preload));
     }

diff --git a/src/ImportmapLaravelServiceProvider.php b/src/ImportmapLaravelServiceProvider.php
@@ -2,9 +2,9 @@
 
 namespace Tonysm\ImportmapLaravel;
 
+use Illuminate\View\Compilers\BladeCompiler;
 use Spatie\LaravelPackageTools\Package;
 use Spatie\LaravelPackageTools\PackageServiceProvider;
-use Tonysm\ImportmapLaravel\View\Components;
 
 class ImportmapLaravelServiceProvider extends PackageServiceProvider
 {
@@ -19,7 +19,6 @@ public function configurePackage(Package $package): void
             ->name('importmap')
             ->hasConfigFile()
             ->hasViews()
-            ->hasViewComponent('importmap', Components\Tags::class)
             ->hasCommand(Commands\InstallCommand::class)
             ->hasCommand(Commands\OptimizeCommand::class)
             ->hasCommand(Commands\ClearCacheCommand::class)
@@ -51,5 +50,14 @@ public function packageBooted()
                 public_path('js') => resource_path('js'),
             ]);
         }
+
+        $this->configureComponents();
+    }
+
+    private function configureComponents()
+    {
+        $this->callAfterResolving('blade.compiler', function (BladeCompiler $blade) {
+            $blade->anonymousComponentPath(__DIR__.'/../resources/views/components', 'importmap');
+        });
     }
 }
diff --git a/src/View/Components/Tags.php b/src/View/Components/Tags.php
diff --git a/tests/ImportmapTest.php b/tests/ImportmapTest.php
@@ -15,8 +15,9 @@ protected function setUp(): void
 
         $this->map = new Importmap(rootPath: __DIR__.DIRECTORY_SEPARATOR.'stubs'.DIRECTORY_SEPARATOR);
 
-        $this->map->pin('app');
-        $this->map->pin('editor', to: 'js/rich_text.js');
+        $this->map->pin('app', preload: false);
+        $this->map->pin('editor', to: 'js/rich_text.js', preload: false);
+        $this->map->pin('not_there', to: 'js/nowhere.js', preload: false);
         $this->map->pin('md5', to: 'https://cdn.skypack.dev/md5', preload: true);
 
         $this->map->pinAllFrom('resources/js/controllers', under: 'controllers', to: 'js/controllers', preload: true);
@@ -90,6 +91,7 @@ public function preload_modules_are_included_in_preload_tags()
 
         $this->assertStringContainsString('md5', $preloadingModulePaths);
         $this->assertStringContainsString('hello_controller', $preloadingModulePaths);
+        $this->assertStringNotContainsString('not_there', $preloadingModulePaths);
         $this->assertStringNotContainsString('app', $preloadingModulePaths);
     }
 }
diff --git a/tests/PreloadingWithLinkHeadersTest.php b/tests/PreloadingWithLinkHeadersTest.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Tonysm\ImportmapLaravel\Tests;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Tonysm\ImportmapLaravel\AssetResolver;
+use Tonysm\ImportmapLaravel\Http\Middleware\AddLinkHeadersForPreloadedPins;
+use Tonysm\ImportmapLaravel\Importmap;
+
+class PreloadingWithLinkHeadersTest extends TestCase
+{
+    /** @test */
+    public function doesnt_set_link_header_when_no_pins_are_preloaded(): void
+    {
+        $this->swap(Importmap::class, $map = new Importmap(rootPath: __DIR__.DIRECTORY_SEPARATOR.'stubs'.DIRECTORY_SEPARATOR));
+
+        $map->pin('app', preload: false);
+        $map->pin('editor', to: 'js/rich_text.js', preload: false);
+        $map->pinAllFrom('resources/js/', under: 'controllers', to: 'js/', preload: false);
+
+        $response = (new AddLinkHeadersForPreloadedPins())->handle(new Request(), function () {
+            return new Response('Hello World');
+        });
+
+        $this->assertNull($response->headers->get('Link'));
+    }
+
+    /** @test */
+    public function sets_link_header_when_pins_are_preloaded(): void
+    {
+        $this->swap(Importmap::class, $map = new Importmap(rootPath: __DIR__.DIRECTORY_SEPARATOR.'stubs'.DIRECTORY_SEPARATOR));
+
+        $map->pin('app', preload: true);
+        $map->pin('editor', to: 'js/rich_text.js', preload: false);
+        $map->pinAllFrom('resources/js/', under: 'controllers', to: 'js/', preload: true);
+
+        $resolver = new class () extends AssetResolver {
+            public function __invoke($module)
+            {
+                return 'http://localhost/'.str_replace(['.js'], ['-123123.js'], $module);
+            }
+        };
+
+        $response = (new AddLinkHeadersForPreloadedPins($resolver))->handle(new Request(), function () {
+            return new Response('Hello World');
+        });
+
+        $this->assertEquals(
+            '<http://localhost/js/app-123123.js>; rel="modulepreload", <http://localhost/js/app-123123.js>; rel="modulepreload", <http://localhost/js/controllers/hello_controller-123123.js>; rel="modulepreload", <http://localhost/js/controllers/index-123123.js>; rel="modulepreload", <http://localhost/js/controllers/utilities/md5_controller-123123.js>; rel="modulepreload", <http://localhost/js/helpers/requests/index-123123.js>; rel="modulepreload", <http://localhost/js/libs/vendor/alpine-123123.js>; rel="modulepreload", <http://localhost/js/spina/controllers/another_controller-123123.js>; rel="modulepreload", <http://localhost/js/spina/controllers/deeper/again_controller-123123.js>; rel="modulepreload"',
+            $response->headers->get('Link'),
+        );
+    }
+}
diff --git a/tests/TagsComponentTest.php b/tests/TagsComponentTest.php
@@ -33,14 +33,14 @@ protected function setUp(): void
     /** @test */
     public function generates_tags_without_nonce()
     {
-        $this->blade('<x-importmap-tags />')
+        $this->blade('<x-importmap::tags />')
             ->assertSee('<link rel="modulepreload" href="https://cdn.skypack.dev/md5" />', escape: false);
     }
 
     /** @test */
     public function uses_given_csp_nonce()
     {
-        $this->blade('<x-importmap-tags nonce="h3ll0" />')
+        $this->blade('<x-importmap::tags nonce="h3ll0" />')
             ->assertSee('<link rel="modulepreload" href="https://cdn.skypack.dev/md5" nonce="h3ll0" />', escape: false);
     }
 
@@ -51,7 +51,7 @@ public function uses_custom_map()
         $importmap->pin('foo', preload: true);
         $importmap->pin('bar', preload: true);
 
-        $this->blade('<x-importmap-tags :importmap="$importmap" />', ['importmap' => $importmap])
+        $this->blade('<x-importmap::tags :importmap="$importmap" />', ['importmap' => $importmap])
             ->assertSee('<link rel="modulepreload" href="'.asset('js/foo.js').'" />', escape: false)
             ->assertSee('<link rel="modulepreload" href="'.asset('js/bar.js').'" />', escape: false)
             ->assertDontSee('<link rel="modulepreload" href="https://cdn.skypack.dev/md5" />', escape: false);

diff --git a/tests/TestCase.php b/tests/TestCase.php
@@ -35,6 +35,7 @@ protected function getPackageProviders($app)
     public function getEnvironmentSetUp($app)
     {
         config()->set('database.default', 'testing');
+        config()->set('app.url', 'http://localhost');
 
         /*
         $migration = include __DIR__.'/../database/migrations/create_importmap-laravel_table.php.stub';

diff --git a/tests/fixtures/npm/single-quote-importmap.php b/tests/fixtures/npm/single-quote-importmap.php
@@ -3,4 +3,4 @@
 use Tonysm\ImportmapLaravel\Facades\Importmap;
 
 Importmap::pin('md5', to: 'https://cdn.skypack.dev/md5', preload: true);
-Importmap::pin('not_there', to: 'nowhere.js');
+Importmap::pin('not_there', to: 'nowhere.js', preload: false);