Feature request: Types for the props parameter of defineModel's default function

[kleinfreund]

The props parameter passed to a defineModel's default function is currently typed as Record<string, unknown>:

const { defaultValue = '' } = defineProps<{ defaultValue?: string }>()
const model = defineModel<string>({ default: (props) => props.defaultValue })
//                                                            ^ unknown

or as whatever type one annotates the props parameter by hand:

const { defaultValue = '' } = defineProps<{ defaultValue?: string }>()
const model = defineModel<string>({ default: (props: { defaultValue: string }) => props.defaultValue })
//                                                                                      ^ string

Instead, the parameter should be typed matching the defineProps interface.

const { defaultValue = '' } = defineProps<{ defaultValue?: string }>()
const model = defineModel<string>({ default: (props) => props.defaultValue })
//                                                            ^ string

As an aside, this would lead to a @typescript-eslint/no-unused-vars error in the destructuring assignment of defaultValue but that's a separate topic.

[posva]

I think this should be achievable in volar. cc @KazariEX

[KazariEX]

• feat(language-core): infer first parameter type of default factory for defineModel language-tools#6210

[posva]

Incredibly fast!