feat: pass props to container (#11138)

4 files changed, 76 insertions, 4 deletions

diff --git a/.changeset/thirty-dots-end.md b/.changeset/thirty-dots-end.md
new file mode 100644
index 000000000..399d0dc81
--- /dev/null
+++ b/.changeset/thirty-dots-end.md
@@ -0,0 +1,17 @@
+---
+"astro": patch
+---
+
+You can now pass `props` when rendering a component using the Container APIs:
+
+```js
+import { experimental_AstroContainer as AstroContainer } from "astro/contaienr";
+import Card from "../src/components/Card.astro";
+
+const container = await AstroContainer.create();
+const result = await container.renderToString(Card, {
+  props: {
+    someState: true
+  }
+});
+```
diff --git a/packages/astro/src/container/index.ts b/packages/astro/src/container/index.ts
index 82859799b..824bc96a4 100644
--- a/packages/astro/src/container/index.ts
+++ b/packages/astro/src/container/index.ts
@@ -3,7 +3,7 @@ import type {
 	AstroRenderer,
 	AstroUserConfig,
 	ComponentInstance,
-	MiddlewareHandler,
+	MiddlewareHandler, Props,
 	RouteData,
 	RouteType,
 	SSRLoadedRenderer,
@@ -70,6 +70,15 @@ export type ContainerRenderOptions = {
 	 * ```
 	 */
 	routeType?: RouteType;
+
+	/**
+	 * Allows to pass `Astro.props` to an Astro component:
+	 * 
+	 * ```js
+	 * container.renderToString(Endpoint, { props: { "lorem": "ipsum" } });
+	 * ```
+	 */
+	props?: Props
 };
 
 function createManifest(
@@ -369,6 +378,9 @@ export class experimental_AstroContainer {
 		if (options.params) {
 			renderContext.params = options.params;
 		}
+		if (options.props) {
+			renderContext.props = options.props;
+		}
 
 		return renderContext.render(componentInstance, slots);
 	}
diff --git a/packages/astro/src/core/render-context.ts b/packages/astro/src/core/render-context.ts
index 27eebc632..307a3f240 100644
--- a/packages/astro/src/core/render-context.ts
+++ b/packages/astro/src/core/render-context.ts
@@ -3,7 +3,7 @@ import type {
 	AstroGlobal,
 	AstroGlobalPartial,
 	ComponentInstance,
-	MiddlewareHandler,
+	MiddlewareHandler, Props,
 	RewritePayload,
 	RouteData,
 	SSRResult,
@@ -47,7 +47,8 @@ export class RenderContext {
 		public status: number,
 		protected cookies = new AstroCookies(request),
 		public params = getParams(routeData, pathname),
-		protected url = new URL(request.url)
+		protected url = new URL(request.url),
+		public props: Props = {}
 	) {}
 
 	/**
@@ -97,7 +98,7 @@ export class RenderContext {
 	): Promise<Response> {
 		const { cookies, middleware, pathname, pipeline } = this;
 		const { logger, routeCache, serverLike, streaming } = pipeline;
-		const props = await getProps({
+		const props = Object.keys(this.props).length > 0 ? this.props : await getProps({
 			mod: componentInstance,
 			routeData: this.routeData,
 			routeCache,
diff --git a/packages/astro/test/container.test.js b/packages/astro/test/container.test.js
index 228844e70..6704aa03f 100644
--- a/packages/astro/test/container.test.js
+++ b/packages/astro/test/container.test.js
@@ -139,4 +139,46 @@ describe('Container', () => {
 		assert.match(result, /Custom name/);
 		assert.match(result, /Bar name/);
 	});
+
+
+	it('Renders props', async () => {
+		const Page = createComponent(
+			(result, props, _slots) => {
+				return render`${renderComponent(
+					result,
+					'BaseLayout',
+					BaseLayout,
+					{},
+					{
+						default: () => render`
+							${maybeRenderHead(result)}
+							${props.isOpen ? "Is open" : "Is closed"}
+							`,
+						head: () => render`
+						${renderComponent(
+							result,
+							'Fragment',
+							Fragment,
+							{ slot: 'head' },
+							{
+								default: () => render`<meta charset="utf-8">`,
+							}
+						)}
+					`,
+					}
+				)}`;
+			},
+			'Component2.astro',
+			undefined
+		);
+
+		const container = await experimental_AstroContainer.create();
+		const result = await container.renderToString(Page, {
+			props: {
+				isOpen: true
+			},
+		});
+
+		assert.match(result, /Is open/);
+	});
 });