[feat] add convenience type for `ComponentEvents` (#7702)

generate-type-definitions.js

@@ -16,7 +16,7 @@ function modify(path, modifyFn) {
 
 modify(
     'types/runtime/index.d.ts',
-    content => content.replace('SvelteComponentTyped', 'SvelteComponentTyped, ComponentType, ComponentConstructorOptions, ComponentProps')
+    content => content.replace('SvelteComponentTyped', 'SvelteComponentTyped, ComponentType, ComponentConstructorOptions, ComponentProps, ComponentEvents')
 );
 modify(
     'types/compiler/index.d.ts',

src/runtime/internal/dev.ts

@@ -301,6 +301,24 @@ export type ComponentProps<Component extends SvelteComponent> = Component extend
 	? Props
 	: never;
 
+/**
+ * Convenience type to get the events the given component expects. Example:
+ * ```html
+ * <script lang="ts">
+ *    import type { ComponentEvents } from 'svelte';
+ *    import Component from './Component.svelte';
+ *
+ *    function handleCloseEvent(event: ComponentEvents<Component>['close']) {
+ *       console.log(event.detail);
+ *    }
+ * </script>
+ *
+ * <Component on:close={handleCloseEvent} />
+ * ```
+ */
+export type ComponentEvents<Component extends SvelteComponent> =
+	Component extends SvelteComponentTyped<any, infer Events> ? Events : never;
+
 export function loop_guard(timeout) {
 	const start = Date.now();
 	return () => {