vue typescript child components

SearchForm.vue.js

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

@Component
export class SearchForm extends Vue {
    public search: string = 'vue';
    @Prop() private color!: string;
    @Watch('search')
    @Emit('search:text')
    private onSeachChanged(val: string, oldVal: string) {
        return val;
    }
}