Template literal autocomplete not working for parameter objects

[kadiryazici]

Bug Report

🔎 Search Terms

typescript cannot get parameter object type when using template literal types

🕗 Version & Regression Information

• This is a bug
• I saw this bug when trying to create an object using template literal as keys by first parameter which is object.

⏯ Playground Link

Link

💻 Code

const obj = {
    name: 'Kadir',
    age: 20
}

function listen<T extends {[key: string]: any}>(obj: T, events: {
    [Key in `on${string & keyof T}`]?: Key
}) {

}

// Do CTRL + Space inside second parameter object and you will see
// autocompletion
listen(obj, {
    
})

// Do CTRL + Space inside second parameter
// you will not get any auto completion
listen({ age: 20 }, {
    
})

🙁 Actual behavior

If object is created in first parameter it won't give autocompletion but will give type errors.

🙂 Expected behavior

It should give autocompletion in second parameter object.

[andrewbranch]

Duplicate of #41620

[kadiryazici]

@andrewbranch I think it is not duplicate. We get autocomplete if we create object before.

[kadiryazici]

@andrewbranch

@andrewbranch

[andrewbranch]

@kadiryazici you’re right, thanks for clarifying. This is pretty weird.