What problem does this feature solve?

Currently it's private:

It's really helpful for use cases like this:

<input
  v-model={password.value}
  type='password'
  onKeyup={withKeys(login, ['enter'])}
/>

Can we consider making it public? Given vue 3 is tree-shakeable, I don't see obvious drawbacks for this.

What does the proposed API look like?

withKeys being public.

If you are using JSX, you should just handle key events yourself. Exposing withKeys locks us into how it works and prevents potential future changes in internal implementations.

For anyone who comes to this, you can write a util function for this need.

export const withEnter = (fn: (...args: any[]) => any) => ({
  key,
}: {
  key: string
}): any => key === 'Enter' && fn()