export * from "fp-ts/Array";
import * as O from "fp-ts/Option";
import { Eq } from "fp-ts/Eq";
export declare const defaultIfEmpty: <T>(a: T[], defaultValue: T) => T[];
export declare const replace: <T>(eq: Eq<T>) => (oldValue: T, newValue: T) => (a: T[]) => O.Option<T[]>;
export declare const notNull: <T>(t: T[]) => NonNullable<T>[];
export declare function fullOuterJoin<A, B, K>(a: A[], aKey: (a: A) => K, b: B[], bKey: (b: B) => K, kEq: Eq<K>): {
    a: A | undefined;
    b: B | undefined;
}[];