/**
 * Simple Either implementation for config parsing validation
 */
export declare type Either<L, R> = Left<L> | Right<R>;
export declare type Left<L> = {
    left: L;
};
export declare type Right<R> = {
    right: R;
};
export declare const isLeft: <L, R>(either: Either<L, R>) => either is Left<L>;
export declare const isRight: <L, R>(either: Either<L, R>) => either is Right<R>;
export declare const Either: {
    /**
     * Successful result
     */
    right: <L, R>(value: R) => Either<L, R>;
    /**
     * Failed result
     */
    left: <L_1, R_1>(value: L_1) => Either<L_1, R_1>;
};