Navigating through Vue3 script Setup and encountering a TypeScript error stating `Type 'string' is not assignable to type 'Stuff | undefined'.` - here's a clever workaround

Having an issue with Vue3's script setup syntax where a strange ts error occurs when trying to assign a variable as a prop value.

I have defined a type Stuff: 'item' | 'box' | 'area' and using it as the PropType for my prop kind in the SearchBar component.

const props = defineProps({
  kind: { type: String as PropType<Stuff> },
  placeholder: String,
})

But when I pass a variable with the value of 'item' to that prop in the component, I encounter this error:

https://i.sstatic.net/7KF3G.png

Type 'string' is not assignable to type 'Stuff | undefined'.

I've noticed similar errors involving the use of string and String before, seemingly related to casing conventions between TS and Vue.

If anyone has any tips or workarounds, your input would be greatly appreciated!

typescriptvue.jsvue-componentvuejs3

Answer №1

Encountering a typical Ts error is not uncommon. I previously faced a similar issue and found the following solution helpful:

    const properties = defineProperties({
      category: { type: Items | undefined },
      placeholderText: String,
    });

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