<template>
 <div>
 <button @click="decrement">-</button>
 {{ count }}
 <button @click="increment">+</button>
 </div>
</template>

<script lang="ts">
 import Vue from 'vue'
 import Component from 'vue-class-component'

 // Define the component in class-style
 @Component
 export default class Counter extends Vue {
 // Class properties will be component data
 count = 0

 // Methods will be component methods
 increment() {
  this.count++
 }

 decrement() {
  this.count--
 }
 }
</script>

import { Vue, Component, Prop } from 'vue-property-decorator'

 @Component
 export default class YourComponent extends Vue {
 @Prop(Number) readonly propA: number | undefined
 @Prop({ default: 'default value' }) readonly propB!: string
 @Prop([String, Boolean]) readonly propC: string | boolean | undefined
}

<template>
 <div class="hello">
 <h1>{{ msg }}</h1>
 <h1>{{ fullName }}</h1>
 <button @click="reverseStr()">Reverse</button>
 </div>
</template>

<script lang="ts">
import { Component, Prop, Vue, Watch } from 'vue-property-decorator';

@Component
export default class HelloWorld extends Vue {
 @Prop() private msg!: string;
 firstName = "rapt";
 lastName = "azure";

 mounted() {
 console.log('mounted');
 }

 // Computed property
 get fullName(): string {
 return this.firstName + this.lastName;
 }

 // Method
 reverseStr() {
 this.firstName = this.firstName.split('').reverse().join('');
 this.lastName = this.lastName.split('').reverse().join('');
 }

}
</script>

<div class="hello">
  <h1>{{ msg }}</h1>
  <h1>{{ test }}</h1>
 </div>
</template>

<script lang="ts">
import Vue from 'vue';

export default Vue.extend({
 name: 'HelloWorld',
 props: {
  msg: String,
 },
 data() {
  return {
   test: "Hello from TS" as string
  }
 },
 methods: {
  pressMe(): string {
   return this.test + 'br'
  }
 }
});
</script>