Keyof function args suggest all keys

[ar53n]

TypeScript Version: 3.7.2

Search Terms:
keyof interface function arguments args

Code

export interface ISocialButtonTypes {
 vk: {vk: string};
 fb: {fb: string};
 ok: {ok: string};
 twitter: {tw: string};
};

export type createSocialItem = <T extends keyof ISocialButtonTypes>(
 socialType: T,
 params: ISocialButtonTypes[T]
) => void;

function createSocialItem<T extends keyof ISocialButtonTypes>(
 socialType: T,
 params?: ISocialButtonTypes[T]
): ISocialButtonTypes[T] {
 return params
}
// the compiler show error, but suggest all keys
createSocialItem('vk', { ok: 'dwdw' })
 ~~~~~~~~~~~~~

Expected behavior:
The second param should suggest only vk key.

Actual behavior:
The params field suggests all keys, but the compiler show error on the incorrect key. The function return works correctly

Playground Link:
https://cutt.ly/cruK8eX

Related Issues:

[RyanCavanaugh]

Going to track this general class of behavior at #35702

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.