export declare const map: <A, B>(f: (a: A) => B) => (arr: A[]) => B[];
export declare const filter: <A>(f: (a: A) => boolean) => (arr: A[]) => A[];
export declare const reject: <A>(f: (a: A) => boolean) => (arr: A[]) => A[];
export declare const find: <A>(f: (a: A) => boolean) => (arr: A[]) => import("./Option").Option<NonNullable<A>>;
export declare const reduce: <A, B>(reduceFn: (acc: B, cur: A, index: number) => B, init: B) => (arr: A[]) => B;
export declare const flat: <A>(arr: A[][]) => A[];