types(reactivity): fix the return type error when the toRaw parameter type is readonly

[Alfred-Skyblue]

type Foo = { a: number; b: string; c: { d: number } }
  const foo: Foo = {
    a: 1,
    b: 'b',
    c: { d: 2 },
  }

  const r = readonly(foo)
  const rawObj = toRaw(r) // ❌ { readonly a: number, readonly b: string, readonly c: {...} }

rawObj is expected to be of type Foo, but the actual result is { readonly a: number, readonly b: string, readonly c: {...} }.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB	38.1 kB	34.2 kB
vue.global.prod.js	160 kB	58 kB	51.5 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	49.1 kB	18.9 kB	17.3 kB
createApp	55.7 kB	21.4 kB	19.6 kB
createSSRApp	59.7 kB	23.1 kB	21 kB
defineCustomElement	60.4 kB	23 kB	20.9 kB
overall	69.4 kB	26.5 kB	24.1 kB

[codspeed-hq]

CodSpeed Performance Report

Merging #9124 will not alter performance

_{Comparing Alfred-Skyblue:fix-toRaw-readolny-type (bd25703) with main (9fa8241)}

Summary

✅ 53 untouched benchmarks

[edison1105]

The test cases can still pass without these changes

[pkg-pr-new]

Open in Stackblitz

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@9124

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@9124

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@9124

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@9124

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@9124

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@9124

@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@9124

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@9124

@vue/shared

pnpm add https://pkg.pr.new/@vue/shared@9124

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@9124

vue

pnpm add https://pkg.pr.new/vue@9124

commit: 221b27d

[netlify]

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[Alfred-Skyblue]

It seems that TypeScript currently allows this, see: microsoft/TypeScript#13347

However, microsoft/TypeScript#58296 is addressing this issue.