I just wanted to create a Vue 3 app with TypeScript

I did this:

npm create vue@latest

In the following process, I enabled TypeScript and the router. I get a component called HelloWorld, where I replace the <script></script> stuff by this:

  <script lang="ts">
    import { defineComponent } from 'vue'
    
    export default defineComponent({
      props: {
        msg: String
      },
      setup(props) {
        props.message // <-- type: string
      },
      methods : {
        handleClick(x: number){
          console.log("x=" + x);
        }
      }
    })

</script>

In the template, I add these two buttons

 <button @click="handleClick(16)">Click me</button>
    <button @click="handleClick('Amen')">Click me</button>

For the second one, I get no error message, although the argument of handleClick must be a number. Clicking on the second button also works, it prints x=Amen

Why does the TypeScript support not work?