Support extending the image API props type (#15014)

Author: delucis

.changeset/smooth-zoos-say.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Adds support for extending the type of the props accepted by Astro’s `<Image>` component, `<Picture>` component, and `getImage()` API.

packages/astro/src/assets/types.ts

@@ -90,7 +90,7 @@ export type ImageTransform = {
 	fit?: ImageFit | undefined;
 	position?: string | undefined;
 	[key: string]: any;
-};
+} & Astro.CustomImageProps;
 
 export interface GetImageResult {
 	rawOptions: ImageTransform;
@@ -231,7 +231,8 @@ type ImageSharedProps<T> = T & {
 				fit?: never;
 				position?: never;
 		  }
-	);
+	) &
+	Astro.CustomImageProps;
 
 export type LocalImageProps<T> = ImageSharedProps<T> & {
 	/**

packages/astro/src/types/public/extendables.ts

@@ -20,6 +20,7 @@ declare global {
 	namespace Astro {
 		export interface IntegrationHooks extends BaseIntegrationHooks {}
 		export interface ClientDirectives extends AstroClientDirectives {}
+		export interface CustomImageProps {}
 	}
 }