import { Unarray } from "./types/common";
declare type Predicate<T> = (item: T) => unknown;
export declare const last: (arr: any[]) => number;
export declare const all: (arr: any[]) => number[];
export declare const keys: (obj: {
    [key: string]: any;
}) => string[];
export declare const find: <T extends any[]>(predicate: Predicate<Unarray<T>>) => (arr: T) => number;
export declare const findByKey: <T extends {
    [key: string]: any;
}>(predicate: Predicate<Extract<keyof T, string>>) => (obj: T) => string | undefined;
export declare const findByVal: <T extends {
    [key: string]: any;
}>(predicate: Predicate<T[keyof T]>) => (obj: T) => string | undefined;
export declare const filter: <T extends any[]>(predicate: Predicate<Unarray<T>>) => (arr: T) => number[];
export declare const filterByKey: <T extends {
    [key: string]: any;
}>(predicate: Predicate<Extract<keyof T, string>>) => (obj: T) => string[];
export declare const filterByVal: <T extends {
    [key: string]: any;
}>(predicate: Predicate<T[keyof T]>) => (obj: T) => string[];
export {};