types: work on typing emitted

Author: lmiller1990

src/vue-wrapper.ts

@@ -62,10 +62,14 @@ export class VueWrapper<T extends ComponentPublicInstance> {
     return true
   }
 
-  emitted(eventName?: string): Record<string, unknown[]> | undefined {
-    // TODO Should we define this?
-    // @ts-ignore
-    return eventName ? this.vm.__emitted[eventName] : this.vm.__emitted
+  emitted<T = unknown>(): Record<string, T[]>
+  emitted<T = unknown>(eventName?: string): T[]
+  emitted<T = unknown>(eventName?: string): T[] | Record<string, T[]> {
+    if (eventName) {
+      const emitted = (this.vm['__emitted'] as Record<string, T[]>)[eventName]
+      return emitted
+    }
+    return this.vm['__emitted'] as Record<string, T[]>
   }
 
   html() {

test-dts/wrapper.d-test.ts

@@ -61,6 +61,15 @@ expectType<SVGLineElement | undefined>(lineArray[0].element)
 byClassArray = domWrapper.findAll('.todo')
 expectType<Element | undefined>(byClassArray[0].element)
 
+// emitted
+// event name
+let incrementEvent = wrapper.emitted<{ count: number }>('increment')
+expectType<{ count: number }>(incrementEvent[0])
+
+// without event name
+let allEvents = wrapper.emitted()
+expectType<Record<string, unknown>>(allEvents)
+
 // get
 // HTML element selector
 let input = wrapper.get('input')