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安装vue-cli4.0时加入typeScript,但是写代码的时候报错了

安装vue-cli4.4.4的时候,问我是否安装ts,我选择了是。为了验证能否用ts,我加入了这行代码 然后就报错了

<script>
export default {
    data () {
        return {

        }
    },
    mounted(){
        let isDone: boolean = false;
    }
}
</script>

image.png

我百度了下,let isDone: boolean = false;确实是ts的语法

ts目录是vue-cli自动帮我配的,所以这就很奇怪,为什么会报错呢?
image.png


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<script lang="ts">

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