Broken ErrorSchema type-definition

[jcqvisser]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle or a shared playground link demonstrating the issue.

What theme are you using?

core

Version

5.0.0.beta.12

Current Behavior

Using TypeScript, when declaring a (presumaby) valid ErrorSchema object, compilation fails due to type errors.

Expected Behavior

ErrorSchema objects, such as those specified in the documentation, should be valid.

Steps To Reproduce

See sandbox: https://codesandbox.io/s/eloquent-cannon-sib4qg?file=/src/App.tsx

Environment

No response

Anything else?

No response

[jcqvisser]

Updating the ErrorSchema type as follows seems to work:

/** Type describing a recursive structure of `FieldErrors`s for an object with a non-empty set of keys */
declare type ErrorSchema<T = any> = FieldErrors & {
    [key in keyof T]?: ErrorSchema<T[key]>;
};

/** This seems to work */
declare type ErrorSchema<T = any> = FieldErrors | {
    [key in keyof T]?: ErrorSchema<T[key]>;
};