diff --git a/src/runtime/ambient.ts b/src/runtime/ambient.ts
index b094056c59..09cd9b72f2 100644
--- a/src/runtime/ambient.ts
+++ b/src/runtime/ambient.ts
@@ -1,19 +1,3 @@
 declare module '*.svelte' {
-	type Props = Record<string, any>;
-
-	export default class {
-		constructor(options: {
-			target: Element;
-			anchor?: Element;
-			props?: Props;
-			hydrate?: boolean;
-			intro?: boolean;
-		});
-
-		$set(props: Props): void;
-		$on<T = any>(event: string, callback: (event: CustomEvent<T>) => void): () => void;
-		$destroy(): void;
-
-		[accessor: string]: any;
-	}
+	export { SvelteComponentDev as default } from 'svelte/internal';
 }
diff --git a/src/runtime/index.ts b/src/runtime/index.ts
index 0973b93f1e..e6c0c916f2 100644
--- a/src/runtime/index.ts
+++ b/src/runtime/index.ts
@@ -8,5 +8,6 @@ export {
 	setContext,
 	getContext,
 	tick,
-	createEventDispatcher
+	createEventDispatcher,
+	SvelteComponentDev as SvelteComponent
 } from 'svelte/internal';
diff --git a/src/runtime/internal/dev.ts b/src/runtime/internal/dev.ts
index 404d0b643a..cb60131166 100644
--- a/src/runtime/internal/dev.ts
+++ b/src/runtime/internal/dev.ts
@@ -79,8 +79,24 @@ export function set_data_dev(text, data) {
 	text.data = data;
 }
 
+
+type Props = Record<string, any>;
+export interface SvelteComponentDev {
+	$set(props?: Props): void;
+	$on<T = any>(event: string, callback: (event: CustomEvent<T>) => void): () => void;
+	$destroy(): void;
+	[accessor: string]: any;
+}
+
 export class SvelteComponentDev extends SvelteComponent {
-	constructor(options) {
+	constructor(options: {
+		target: Element;
+		anchor?: Element;
+		props?: Props;
+		hydrate?: boolean;
+		intro?: boolean;
+		$$inline?: boolean;
+    }) {
 		if (!options || (!options.target && !options.$$inline)) {
 			throw new Error(`'target' is a required option`);
 		}
@@ -103,4 +119,4 @@ export function loop_guard(timeout) {
 			throw new Error(`Infinite loop detected`);
 		}
 	};
-}
\ No newline at end of file
+}