fix: Update $derived.call type declaration (#10349)

Not-Jayden · dummdidumm · trueadm · commit d50789efd4bb · 2024-01-31T13:13:02.000Z
---------

Co-authored-by: Simon H &lt;5968653+dummdidumm@users.noreply.github.com&gt;
diff --git a/.changeset/honest-dragons-turn.md b/.changeset/honest-dragons-turn.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+Use generic `T` as the return type for `$derived.call()`
diff --git a/packages/svelte/src/main/ambient.d.ts b/packages/svelte/src/main/ambient.d.ts
@@ -77,7 +77,7 @@ declare namespace $derived {
 	 *
 	 * https://svelte-5-preview.vercel.app/docs/runes#$derived-call
 	 */
-	export function call<T>(fn: () => T): void;
+	export function call<T>(fn: () => T): T;
 }
 
 /**
diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
@@ -2511,7 +2511,7 @@ declare namespace $derived {
 	 *
 	 * https://svelte-5-preview.vercel.app/docs/runes#$derived-call
 	 */
-	export function call<T>(fn: () => T): void;
+	export function call<T>(fn: () => T): T;
 }
 
 /**

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'svelte': patch
 +---
++
 +Use generic `T` as the return type for `$derived.call()`
Original file line number	Diff line number	Diff line change
`@@ -77,7 +77,7 @@ declare namespace $derived {`
`77`	`77`	`*`
`78`	`78`	`* https://svelte-5-preview.vercel.app/docs/runes#$derived-call`
`79`	`79`	`*/`
`80`		`- export function call<T>(fn: () => T): void;`
	`80`	`+ export function call<T>(fn: () => T): T;`
`81`	`81`	`}`
`82`	`82`
`83`	`83`	`/**`
Original file line number	Diff line number	Diff line change
`@@ -2511,7 +2511,7 @@ declare namespace $derived {`
`2511`	`2511`	`*`
`2512`	`2512`	`* https://svelte-5-preview.vercel.app/docs/runes#$derived-call`
`2513`	`2513`	`*/`
`2514`		`- export function call<T>(fn: () => T): void;`
	`2514`	`+ export function call<T>(fn: () => T): T;`
`2515`	`2515`	`}`
`2516`	`2516`
`2517`	`2517`	`/**`