1 files changed, 6 insertions, 4 deletions
diff --git a/packages/integrations/svelte/context.js b/packages/integrations/svelte/src/context.ts
index faec823a0..833755044 100644
--- a/packages/integrations/svelte/context.js
+++ b/packages/integrations/svelte/src/context.ts
@@ -1,8 +1,10 @@
-const contexts = new WeakMap();
+import type { SSRResult } from 'astro';
+
+const contexts = new WeakMap<SSRResult, { currentIndex: number; readonly id: string }>();
 
 const ID_PREFIX = 's';
 
-function getContext(rendererContextResult) {
+function getContext(rendererContextResult: SSRResult) {
 	if (contexts.has(rendererContextResult)) {
 		return contexts.get(rendererContextResult);
 	}
@@ -16,8 +18,8 @@ function getContext(rendererContextResult) {
 	return ctx;
 }
 
-export function incrementId(rendererContextResult) {
-	const ctx = getContext(rendererContextResult);
+export function incrementId(rendererContextResult: SSRResult) {
+	const ctx = getContext(rendererContextResult)!;
 	const id = ctx.id;
 	ctx.currentIndex++;
 	return id;