From dece6e42f246e5669d3f99ee0b763f06441232ac Mon Sep 17 00:00:00 2001
From: Nandor Kraszlan <nandor.kraszlan@gmail.com>
Date: Tue, 16 Feb 2021 12:44:38 +0000
Subject: [PATCH 1/4] bug: added test case

---
 tests/props.spec.ts | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/tests/props.spec.ts b/tests/props.spec.ts
index d2e543fd3..ebb852e3b 100644
--- a/tests/props.spec.ts
+++ b/tests/props.spec.ts
@@ -1,6 +1,7 @@
 import { mount } from '../src'
 import WithProps from './components/WithProps.vue'
 import Hello from './components/Hello.vue'
+import { defineComponent } from 'vue'
 
 describe('props', () => {
   it('returns a single prop applied to a component', () => {
@@ -82,4 +83,32 @@ describe('props', () => {
       object: {}
     })
   })
+
+  it('should return the updated props on 2 way binding', async () => {
+    const component = defineComponent({
+      template: '<button @click="increment"></button>',
+      props: {
+        modelValue: {
+          type: Number,
+          required: true
+        }
+      },
+      emits: ['update:modelValue'],
+      setup(props, ctx) {
+        return {
+          increment: () => ctx.emit('update:modelValue', props.modelValue + 1)
+        }
+      }
+    });
+
+    const wrapper = mount(component, {
+      props: {
+        modelValue: 1
+      }
+    })
+
+    expect(wrapper.props('modelValue')).toBe(1);
+    await wrapper.trigger('click');
+    expect(wrapper.props('modelValue')).toBe(2);
+  })
 })

From 09a12391604e5e9f451e8f702814cdc4d8d2bfdd Mon Sep 17 00:00:00 2001
From: Nandor Kraszlan <nandor.kraszlan@gmail.com>
Date: Tue, 16 Feb 2021 17:17:06 +0000
Subject: [PATCH 2/4] fix: Added prop update on emit for v-model

---
 src/emit.ts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/emit.ts b/src/emit.ts
index 27e292534..05b06c883 100644
--- a/src/emit.ts
+++ b/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]
+  }
 }

From a3ad28e227bac1b740459b9d29971d47f3716ffc Mon Sep 17 00:00:00 2001
From: Nandor Kraszlan <nandor.kraszlan@gmail.com>
Date: Tue, 16 Feb 2021 17:19:00 +0000
Subject: [PATCH 3/4] fix: Fixed lint issues

---
 src/emit.ts         | 6 +++++-
 tests/props.spec.ts | 8 ++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/emit.ts b/src/emit.ts
index 05b06c883..19a5f4046 100644
--- a/src/emit.ts
+++ b/src/emit.ts
@@ -67,7 +67,11 @@ function recordEvent(
 
   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.')
+      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]
diff --git a/tests/props.spec.ts b/tests/props.spec.ts
index ebb852e3b..cff91719f 100644
--- a/tests/props.spec.ts
+++ b/tests/props.spec.ts
@@ -99,7 +99,7 @@ describe('props', () => {
           increment: () => ctx.emit('update:modelValue', props.modelValue + 1)
         }
       }
-    });
+    })
 
     const wrapper = mount(component, {
       props: {
@@ -107,8 +107,8 @@ describe('props', () => {
       }
     })
 
-    expect(wrapper.props('modelValue')).toBe(1);
-    await wrapper.trigger('click');
-    expect(wrapper.props('modelValue')).toBe(2);
+    expect(wrapper.props('modelValue')).toBe(1)
+    await wrapper.trigger('click')
+    expect(wrapper.props('modelValue')).toBe(2)
   })
 })

From 1ef3f86714b486767e06c71405c650fd60146b35 Mon Sep 17 00:00:00 2001
From: nandi95 <41805560+nandi95@users.noreply.github.com>
Date: Wed, 17 Feb 2021 00:41:54 +0000
Subject: [PATCH 4/4] fix: update spacing

---
 src/emit.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/emit.ts b/src/emit.ts
index 19a5f4046..74fd44c8e 100644
--- a/src/emit.ts
+++ b/src/emit.ts
@@ -68,7 +68,7 @@ function recordEvent(
   if (event.startsWith('update:')) {
     if (args.length !== 1) {
       throw new Error(
-        'Two-way bound properties have to emit a single value.' +
+        'Two-way bound properties have to emit a single value. ' +
           args.length +
           ' values given.'
       )