fix(types): improve SetupContext types (#595)

src/component/componentOptions.ts

@@ -5,10 +5,27 @@ import { ComponentInstance, ComponentRenderProxy } from './componentProxy'
 
 export interface SetupContext {
   readonly attrs: Data
-  readonly slots: { [key: string]: (...args: any[]) => VNode[] }
+  readonly slots: Readonly<{ [key in string]?: (...args: any[]) => VNode[] }>
+
+  /**
+   * @deprecated not avaliable in Vue 3
+   */
   readonly parent: ComponentInstance | null
+
+  /**
+   * @deprecated not avaliable in Vue 3
+   */
   readonly root: ComponentInstance
-  readonly listeners: { [key: string]: Function }
+
+  /**
+   * @deprecated not avaliable in Vue 3
+   */
+  readonly listeners: { [key in string]?: Function }
+
+  /**
+   * @deprecated not avaliable in Vue 3
+   */
+  readonly refs: Data
 
   emit(event: string, ...args: any[]): void
 }

src/mixin.ts

@@ -88,6 +88,7 @@ export function mixin(Vue: VueConstructor) {
     def(props, '__ob__', createObserver())
 
     // resolve scopedSlots and slots to functions
+    // @ts-expect-error
     resolveScopedSlots(vm, ctx.slots)
 
     let binding: ReturnType<SetupFunction<Data, Data>> | undefined | null
@@ -102,6 +103,7 @@ export function mixin(Vue: VueConstructor) {
       const bindingFunc = binding
       // keep currentInstance accessible for createElement
       vm.$options.render = () => {
+        // @ts-expect-error
         resolveScopedSlots(vm, ctx.slots)
         return activateCurrentInstance(vm, () => bindingFunc())
       }