When reviewing the code below, Vetur concluded that x,y are of type number | undefined.
The presence of undefined is leading to numerous warnings when using x,y further in the code.
Is there a way to eliminate the undefined from the type inference?
<script lang="ts">
import { defineComponent } from 'vue'
export default defineComponent({
props: { x: Number, y: Number },
setup(props) {
let { x, y } = props
},
})
</script>
Each prop is considered optional (meaning it could potentially be undefined) by default, so when typing your props, they are defined as number | undefined.
If you want to make the props required, you can use the full form of prop declaration, which eliminates the | undefined from the type of the prop:
<script lang="ts">
import { defineComponent } from 'vue'
export default defineComponent({
props: {
x: {
type: Number,
required: true, //👈
},
y: {
type: Number,
required: true, //👈
},
},
setup(props) {
let { x, y } = props
},
})
</script>
On a side note, Vetur has been deprecated and it is recommended to use Volar as the officially supported VS Code extension for Vue 3 and TypeScript.
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