Function findIndex

findIndex<T>():
    | Curried2<
        (val: T, index?: number, arr?: T) => boolean,
        T[],
        undefined | number,
    >
    | Curried2<
        (val: T, key?: string, obj?: Record<string, T>) => boolean,
        Record<string, T>,
        undefined | string,
    >

findIndex<T>(
    fn: (val: T, index?: number, arr?: T) => boolean,
): Curried1<T[], undefined | number>

findIndex<T>(
    fn: (val: T, key?: string, obj?: Record<string, T>) => boolean,
): Curried1<Record<string, T>, undefined | string>

findIndex<T>(
    fn: (val: T, index?: number, arr?: T) => boolean,
    arr: T[],
): undefined | number

findIndex<T>(
    fn: (val: T, key?: string, obj?: Record<string, T>) => boolean,
    obj: Record<string, T>,
): undefined | string