Type of Key in react-aria does not match type of Key in React

[vbudovski]

Provide a general summary of the issue here

The type of Key in react-aria is defined as:

export type Key = string | number;

while React defines it as:

type Key = string | number | bigint;

Is there a reason to not use the React definition of the key? You can re-export it from react-aria.
If you do wish to re-define it, perhaps it would be good to add some typechecks to react-aria to make sure they are interchangable at least.

e.g.

type AriaKey = string | number;
type Intersection = ReactKey & AriaKey;
let reactKey: ReactKey;
// This line will produce a TypeScript error if they don't overlap.
const intersection: Intersection =
    // @ts-ignore We don't care about this error.
    reactKey;

🤔 Expected Behavior?

React Key can be passed to props expecting a unique ID/key.

😯 Current Behavior

There's a type mismatch and TypeScript complains when you pass a React Key to id prop for instance.

💁 Possible Solution

See above.

🔦 Context

No response

🖥️ Steps to Reproduce

import type { Key } from 'react';

const id: Key = '123'

<Tag
    // @ts-ignore FIXME: Incorrect type in react-aria-components.
    id={id}
>
  Hello
</Tag>

Version

RAC 1.1.1

What browsers are you seeing the problem on?

Other

If other, please specify.

TypeScript issue.

What operating system are you using?

Mac OS

🧢 Your Company/Team

No response

🕷 Tracking Issue

No response

[snowystinger]

Great question. We moved away from their definition because they introduced a breaking change to it in a minor. However, we were already thinking of moving away from it as it isn't really the same thing as in React and it didn't make sense to be tied to their definition.

[vbudovski]

Thanks for that. Would it be better to rename it then? Any reason not to include bigint as well? Some additional documentation highlighting this type would be helpful.

[snowystinger]

We can't rename it without a big breaking change. Though we're slowly moving away from it with continued support. We didn't include BigInt because we have not tested with those values.

[Kadrian]

Is there anything you'd recommend we do in the mean time? Should we simply add @ts-expect-error to all places we encouter this error? Or is there a way to globally ignore this somehow?

[snowystinger]

It'd be best for future updates if you changed to import {Key} from 'react-aria-components';
You can rename it if you like as well, import {Key as RACKey} from 'react-aria-components';

There may be some libraries that allow you to ignore certain ts codes as well.