Incorrect types for `diffJson`

[joshkel]

@types/diff gave the following types for diffJson:

export function diffJson(
    oldObj: string | object,
    newObj: string | object,
    options?: JsonOptions,
): Change[];
export function diffJson(
    oldObj: string | object,
    newObj: string | object,
    options: Callback<Change[]> | (JsonOptions & CallbackOptions<Change[]>),
): void;

And, since diffJson serializes to JSON itself, these types appear to be correct. However, diff v8 requires string inputs:

export declare function diffJson(oldStr: string, newStr: string, options: DiffCallbackNonabortable<string>): undefined;
export declare function diffJson(oldStr: string, newStr: string, options: DiffJsonOptionsAbortable & CallbackOptionAbortable<string>): undefined;
export declare function diffJson(oldStr: string, newStr: string, options: DiffJsonOptionsNonabortable & CallbackOptionNonabortable<string>): undefined;
export declare function diffJson(oldStr: string, newStr: string, options: DiffJsonOptionsAbortable): ChangeObject<string>[] | undefined;
export declare function diffJson(oldStr: string, newStr: string, options?: DiffJsonOptionsNonabortable): ChangeObject<string>[];

[ExplodingCabbage]

D'oh. Yeah, that's definitely wrong. Thanks for catching. Will fix right now.

Probably I should've ported the whole test suite to TypeScript to catch bugs like this.