Version

3.2.31

Reproduction link

www.typescriptlang.org/play

Steps to reproduce

Reproduction link

What is expected?

ref should not unwrap all properties of the entity type

What is actually happening?

Reproduction link

You can use the RefUnwrapBailTypes: https://github.com/vuejs/core/blob/main/packages/reactivity/src/ref.ts#L252-L269 to avoid unwrapping.

It can solve the tuple type recursion problem, but it is buggy in the source code. Hope you look at this line of code (https://github.com/vuejs/core/blob/main/packages/reactivity/src/ref.ts#L297), the extends ? : evaluation is problematic, for all object type is always true.

interface X {
    a: 1
    b: 2
    c: 3
    d: 4
}

// bug line: https://github.com/vuejs/core/blob/main/packages/reactivity/src/ref.ts#L297

type Unwrap<T> = T extends (object & { xx?: never }) ? true : false
{
    type Test1 = Unwrap<X> // true
    //   ^?
    type Test2 = Unwrap<X & { xx: never }> // true
    //   ^?
}

ts playground

And a project defines many object types, developers do not need to put all object types into RefUnwrapBailTypes