Exploring the use of the ValidationRule type from the Vuetify library (check out the docs and source code), I'm facing difficulties importing it into my Vue.js component.
I have attempted to import the type in different ways, such as:
import type { ValidationRule } from 'vuetify/types'
Unfortunately, none of these approaches seem to be working for me.
As of now, Vuetify does not directly export the type. However, you can obtain it by extracting it from component declarations, similar to the approach outlined in this referenced answer:
import type { VTextField } from 'vuetify/components'
type UnwrapReadonlyArray<A> = A extends Readonly<Array<infer I>> ? I : A;
type ValidationRule = UnwrapReadonlyArray<VTextField['rules']>
The specific component used is not crucial, as long as it utilizes the ValidationRule type. In this case, VTextField incorporates a :rules prop, which is why it is being leveraged here.
Accessing the rules index results in the type readonly ValidationRule[].
Ultimately, the UnwrapReadonlyArray type helps in extracting the array item type and eliminating the readonly modifier.
Prior to Vuetify 3.4, constructor functions were exported instead of types, necessitating the construction of the type manually:
type VTextFieldType = InstanceType<typeof VTextField>
type ValidationRule = UnwrapReadonlyArray<VTextFieldType['rules']>
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