Incorrect type inference for exported configs object: {}

[JoshuaKGoldberg]

Right now, when I try to use the plugin in files with type-aware linting and typescript-eslint's recommendedTypeChecked config, I get:

/Users/josh/repos/typescript-eslint-examples/packages/eslint-plugin-example-typed-linting/eslint.config.mjs
  9:5  error  Unsafe argument of type `any` assigned to a parameter of type `ConfigWithExtends`  @typescript-eslint/no-unsafe-argument

...on lines like:

export default tseslint.config(
    eslintPlugin.configs['flat/recommended'],
);

Example: https://github.com/typescript-eslint/examples/blob/b91625d418f63b4bcc5127f2fb213222dcadf3cc/packages/eslint-plugin-example-typed-linting/eslint.config.mjs

The root cause is that the module's exported config object is inferred from .js to be {}:

eslint-plugin-eslint-plugin/lib/index.js

Line 51 in 95b1980

configs: {}, // assigned later

Normally for a project that isn't written in TypeScript I'd just send a PR to DefinitelyTyped. But because this project already has #310 in its issues, I figured I'd give this a shot. 🙂

[voxpelli]

I’m +1 to generate types for this module

[bmish]

Will be handled by this issue which should be in the works soon:

• Add TypeScript type-checking to all rules #310