fix(language-core): make model modifiers optional

[stafyniaksacha]

This pull request includes changes to improve the handling of component property modifiers in the generateComponentProps function and its associated tests.

It aims to better reflect modelModifiers type marking keys as optional:

<!-- MyComp.vue -->
<script setup lang="ts">
const [modelValue, modelModifiers] = defineModel<string, 'foo' | 'bar'>()

// modelModifiers.foo?: true
// modelModifiers.bar?: true
</script>

With this update, we can omit keys when manually defining model-modifiers prop

<template>
  <!-- Type '{ foo: true; }' is missing the following properties from type 'Record<"foo" | "bar", true>': bar -->
  <MyComp :model-modifiers="{ foo: true }" />
</template>

Note that it will also fix type when using vitest and @vue/test-utils:

import { MyComp } from './MyComp.vue'
import { mount } from '@vue/test-utils'
import { it } from 'vitest'

it('should foo modifier', async () => {
  const component = mount(MyComp, {
    props: {
      // Type '{ foo: true; }' is missing the following properties from type 'Record<"foo" | "bar", true>': bar
      'modelModifiers': { foo: true },
    },
  })
})

[pkg-pr-new[bot]]

Open in Stackblitz

vue-component-meta

``` pnpm add https://pkg.pr.new/vuejs/language-tools/vue-component-meta@4978 ```

vue-component-type-helpers

``` pnpm add https://pkg.pr.new/vuejs/language-tools/vue-component-type-helpers@4978 ```

@vue/language-plugin-pug

``` pnpm add https://pkg.pr.new/vuejs/language-tools/@vue/language-plugin-pug@4978 ```

@vue/language-core

``` pnpm add https://pkg.pr.new/vuejs/language-tools/@vue/language-core@4978 ```

@vue/language-server

``` pnpm add https://pkg.pr.new/vuejs/language-tools/@vue/language-server@4978 ```

@vue/language-service

``` pnpm add https://pkg.pr.new/vuejs/language-tools/@vue/language-service@4978 ```

vue-tsc

``` pnpm add https://pkg.pr.new/vuejs/language-tools/vue-tsc@4978 ```

@vue/typescript-plugin

``` pnpm add https://pkg.pr.new/vuejs/language-tools/@vue/typescript-plugin@4978 ```

commit: debf21b

[KazariEX]

Could you please add a test case?

[stafyniaksacha]

Could you please add a test case?

Yes sure, where should I put them ? I only contributed to components-meta env (time ago https://github.com/vuejs/language-tools/pull/4175)

[KazariEX]

Added.