#53258 breaks ckeditor__ckeditor5-upload on DT

[sandersn]

Here is a small repro based on that package:

export default class FileReader implements Observable {
    set(option: Record<string, unknown>): void;
    set(name: string, value: unknown): void;
}
export interface Observable {
    set(...args: [option: Record<string, unknown>] | [name: string, value: unknown] | [name: string]): void;
}

[jakebailey]

I might be wrong but the second overload is already an error in TS 5.0; is that intentional?

[jakebailey]

Oh, nevermind; it's missing declare.

[jakebailey]

I think I may just revert my PR and try and go for fixing #53398 instead.