fix(InputMenu/Select/SelectMenu): improve types (#2471)

test/utils/types.ts

@@ -0,0 +1,13 @@
+import { expectTypeOf } from 'vitest'
+import type { VNode } from 'vue'
+
+/**
+ * Expect the type of a component emit payload.
+ */
+export function expectEmitPayloadType<T extends VNode, E extends keyof Events<T>>(_event: E, _cb: () => T) {
+  return expectTypeOf<NonNullable<Events<T>[E]>>()
+}
+
+type Events<T> = T extends { __ctx?: { props: infer Props } } ? {
+  [K in keyof Props as K extends `on${infer E}${infer Rest}` ? `${Lowercase<E>}${Rest}` : never]: NonNullable<Props[K]> extends (...args: infer P) => any ? P : never
+} : never