npm install vue-class-component vue-property-decorator --save-dev

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

@Component
export default class App extends Vue {
 name:string = 'Simon Zhang'

 // computed
 get MyName():string {
 return `My name is ${this.name}`
 }

 // methods
 sayHello():void {
 alert(`Hello ${this.name}`)
 }

 mounted() {
 this.sayHello();
 }
}

export default {
 data () {
 return {
 name: 'Simon Zhang'
 }
 },

 mounted () {
 this.sayHello()
 },

 computed: {
 MyName() {
 return `My name is ${this.name}`
 }
 },

 methods: {
 sayHello() {
 alert(`Hello ${this.name}`)
 },
 }
}

@Component({
 components: {
 XXXX
 },
 props: {
 mapFlag: Number
 }
})

let layoutList:any = this.$refs.layout as HTMLDivElement