simplify

Author: Rich-Harris

packages/svelte/src/internal/client/runtime.js

@@ -820,7 +820,7 @@ function process_effects(effect) {
  * Returns void if no callback is provided, otherwise returns the result of calling the callback.
  * @template [T=void]
  * @param {(() => T) | undefined} [fn]
- * @returns {T extends void ? void : T}
+ * @returns {T}
  */
 export function flushSync(fn) {
 	var result;
@@ -839,7 +839,7 @@ export function flushSync(fn) {
 		flush_tasks();
 	}
 
-	return /** @type {T extends void ? void : T} */ (result);
+	return /** @type {T} */ (result);
 }
 
 /**

packages/svelte/types/index.d.ts

@@ -421,7 +421,7 @@ declare module 'svelte' {
 	 * Synchronously flush any pending updates.
 	 * Returns void if no callback is provided, otherwise returns the result of calling the callback.
 	 * */
-	export function flushSync<T = void>(fn?: (() => T) | undefined): T extends void ? void : T;
+	export function flushSync<T = void>(fn?: (() => T) | undefined): T;
 	/**
 	 * Returns a promise that resolves once any pending state changes have been applied.
 	 * */