Utilizing Vue 3 with TypeScript for enforcing type checking on single file components' props

In my exploration of Vuetify and other sources, I discovered that it is possible to incorporate type checking for props within the template tag.

Let's consider a simple button component:

<template>
    <div>
        <button>{{ label }}</button>
    </div>
</template>

<script lang="ts">
import { defineComponent } from 'vue';

export default defineComponent({
    props: {
        label: { type: String as () => string, default: '' },
    },
});
</script>

Now, in the parent component:

<button-component :label="true" />

Even though Vue provides a compiler warning indicating that the parameter is incorrect, is it feasible to check for errors while typing out the code? If not, why specify TypeScript types in the props?

Answer №1

After reviewing the Typescript support documentation, it appears that using type:String is sufficient for defining props in Vue components. However, you can also add a validator if necessary:

export default defineComponent({
    props: {
        label: { 
          type: String ,
          default: ''
          },
    },
});

Another approach would be:

export default defineComponent({
    props: {
        label: {
          type: String as PropType<string>,
          default: ''
          },
    },
});

It seems like the syntax you are utilizing is more suitable for checking function types.

Answer №2

To submit a String instead of a boolean, you can use the following method:

<button-component :label="`true`" />

The Vue compiler automatically converts your true value to a boolean when binding, so make sure to specify a string input explicitly.

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