Add SDK-author resource constructor dependencies

docs/03-api.md

@@ -111,6 +111,22 @@ Protected helper for creating resource instances from an API class.
 
 See [Resource Authoring](04-resource-authoring.md) for the recommended API-to-resource pattern.
 
+### `resourceWith()`
+
+> **Available since version 3.3.0.**
+
+```php
+resourceWith(string $class, mixed ...$arguments): Resource
+```
+
+Protected helper for creating a resource with typed SDK-author constructor
+dependencies. The resource `Runtime` is provided automatically as the first
+constructor argument; additional positional or named arguments are forwarded
+after it.
+
+See [Resource Constructor Dependencies](04-resource-authoring.md#resource-constructor-dependencies)
+for the complete authoring pattern.
+
 ## Request Defaults
 
 ### `baseUrl()`

docs/04-resource-authoring.md

@@ -39,6 +39,61 @@ final class ExampleApi extends Api
 
 `Api::resource()` creates a fresh resource instance. Resource-chain infrastructure overrides, such as `withCache()`, are immutable, so fluent customizations do not leak into later calls.
 
+## Resource Constructor Dependencies
+
+> **Available since version 3.3.0.**
+
+Use `resourceWith()` when a resource needs typed, SDK-author-owned data that
+should not be placed in the shared SDK config. The runtime is injected
+automatically as the first constructor argument.
+
+```php
+use ProgrammatorDev\Api\Api;
+use ProgrammatorDev\Api\Resource;
+use ProgrammatorDev\Api\Runtime;
+
+final class ExampleApi extends Api
+{
+    public function __construct(
+        private readonly string $apiKey,
+    ) {
+        parent::__construct();
+    }
+
+    public function assets(): AssetResource
+    {
+        return $this->resourceWith(
+            AssetResource::class,
+            apiKey: $this->apiKey,
+        );
+    }
+}
+
+final class AssetResource extends Resource
+{
+    public function __construct(
+        Runtime $runtime,
+        private readonly string $apiKey,
+    ) {
+        parent::__construct($runtime);
+    }
+
+    public function url(string $file): string
+    {
+        return sprintf(
+            'https://cdn.example.com/assets/%s?key=%s',
+            rawurlencode($file),
+            rawurlencode($this->apiKey),
+        );
+    }
+}
+```
+
+This keeps the dependency private to the concrete API and resource. Use
+`Config` for SDK options that should also be available to contexts, entities,
+envelopes, hooks, and error handlers. Credentials used for HTTP authentication
+should still be configured through `auth()`.
+
 ## Endpoint Requests
 
 Use `endpoint()` inside resource methods to create the request builder:

src/Api.php

@@ -107,6 +107,17 @@ protected function resource(string $class): Resource
         return new $class($this->runtime());
     }
 
+    /**
+     * @template T of Resource
+     * @param class-string<T> $class
+     * @return T
+     * @todo Merge constructor argument forwarding into resource() in the next major release.
+     */
+    protected function resourceWith(string $class, mixed ...$arguments): Resource
+    {
+        return new $class($this->runtime(), ...$arguments);
+    }
+
     protected function baseUrl(?string $baseUrl): static
     {
         $this->baseUrl = $baseUrl;

tests/Integration/ApiTest.php

@@ -7,6 +7,8 @@
 use ProgrammatorDev\Api\Context\RequestContext;
 use ProgrammatorDev\Api\Context\ResponseContext;
 use ProgrammatorDev\Api\Http\Method;
+use ProgrammatorDev\Api\Resource;
+use ProgrammatorDev\Api\Runtime;
 use ProgrammatorDev\Api\Test\Fixture\FakeApi;
 use ProgrammatorDev\Api\Test\Fixture\HeaderPlugin;
 use ProgrammatorDev\Api\Test\Support\AbstractTestCase;
@@ -32,6 +34,30 @@ public function testConfigCanBeSetAndReadBySdkApi(): void
         ], $api->config()->all());
     }
 
+    public function testSdkAuthorCanPassTypedConstructorDependenciesToResource(): void
+    {
+        $api = new class('secret') extends Api {
+            public function __construct(
+                private readonly string $apiKey
+            ) {
+                parent::__construct();
+            }
+
+            public function links(): ConstructorDependencyResource
+            {
+                return $this->resourceWith(
+                    ConstructorDependencyResource::class,
+                    apiKey: $this->apiKey
+                );
+            }
+        };
+
+        $this->assertSame(
+            'https://api.example.com/files/report%201.pdf?api_key=secret',
+            $api->links()->url('report 1.pdf')
+        );
+    }
+
     public function testApiCanSendPublicRequest(): void
     {
         $client = $this->mockClient(new Response(body: '{"id":1,"name":"John"}'));
@@ -235,3 +261,22 @@ enum ApiRequestValue: string
 {
     case ACTIVE = 'active';
 }
+
+final class ConstructorDependencyResource extends Resource
+{
+    public function __construct(
+        Runtime $runtime,
+        private readonly string $apiKey
+    ) {
+        parent::__construct($runtime);
+    }
+
+    public function url(string $file): string
+    {
+        return sprintf(
+            'https://api.example.com/files/%s?api_key=%s',
+            rawurlencode($file),
+            rawurlencode($this->apiKey)
+        );
+    }
+}