export declare type Fn<P extends any[] = any[], T = any> = (...args: P) => T;
export declare type ItemOrArray<T> = T | T[];
export declare type ArrayLengthMutationKeys = 'splice' | 'push' | 'pop' | 'shift' | 'unshift';
export declare type FixedLengthArray<T, L extends number, TObj = [T, ...Array<T>]> = Pick<TObj, Exclude<keyof TObj, ArrayLengthMutationKeys>> & {
    readonly length: L;
    [I: number]: T;
    [Symbol.iterator]: () => IterableIterator<T>;
};
export declare type IterableV<T> = T extends Iterable<infer V> ? V : unknown;