fix: Added prop update on emit for v-model

Author: nandi95

src/emit.ts

@@ -48,7 +48,7 @@ function recordEvent(
   events: Events,
   vm: ComponentInternalInstance,
   event: string,
-  args: Events[number]
+  args: unknown[]
 ): void {
   // Functional component wrapper creates a parent component
   let wrapperVm = vm
@@ -64,4 +64,12 @@ function recordEvent(
 
   // Record the event message sent by the emit
   events[cid][event].push(args)
+
+  if (event.startsWith('update:')) {
+    if (args.length !== 1) {
+      throw new Error('Two-way bound properties have to emit a single value.' + args.length + ' values given.')
+    }
+
+    vm.props[event.slice('update:'.length)] = args[0]
+  }
 }