/** Type used to represent either success or failure. */
export interface IResult<T, E> {
    /** Returns the value if result is `Ok`, `undefined` if `Err`. */
    ok(): T | undefined;
    /** Returns `true` if result is `Ok`, `false` if `Err`. */
    isOk(): boolean;
    /** Returns the error if result is `Err`, `undefined` if `Ok`. */
    err(): E | undefined;
    /** Returns `true` if result is `Err`, `false` if `Ok`. */
    isErr(): boolean;
    /**
     * Maps an `IResult<T, E>` to `IResult<U, E>` by applying the function provided
     * to a contained `Ok` value, leaving an `Err` value untouched.
     */
    map<U>(op: (value: T) => U): IResult<U, E>;
    /**
     * Maps an `IResult<T, E>` to `IResult<T, F>` by applying the function provided
     * to a contained `Err` value, leaving an `Ok` value untouched.
     */
    mapErr<F>(op: (error: E) => F): IResult<T, F>;
    /**
     * Returns `res` if the receiver is `Ok`, otherwise returns the `Err` value of
     * the receiver.
     */
    and<U>(res: IResult<U, E>): IResult<U, E>;
    /**
     * Invokes `op` if the receiver is `Ok`, returning the result.
     * If the receiver is `Err`, returns the `Err` value of the receiver.
     */
    andThen<U>(op: (value: T) => IResult<U, E>): IResult<U, E>;
    /**
     * Unwraps the result, yielding the contents of the receiver if `Ok`.
     * Throws an exception if the receiver is an `Err`.
     */
    unwrap(): T;
    /**
     * Unwraps the result, yielding the contents of the receiver if `Err`.
     * Throws an exception if the receiver is an `Ok`.
     */
    unwrapErr(): E;
    /**
     * Unwraps a result, yielding the content if the receiver is `Ok`.
     * If the receiver is an `Err`, returns `outherwise`.
     */
    unwrapOr(otherwise: T): T;
    /**
     * Unwraps a result, yielding the content if the receiver is `Ok`.
     * If the receiver is an `Err`, returns the result of invoking the parameter.
     */
    unwrapOrElse(otherwise: (error: E) => T): T;
}
/** Contains the success value. */
export declare class Ok<T, E> implements IResult<T, E> {
    private value;
    constructor(v: T);
    ok(): T | undefined;
    isOk(): boolean;
    err(): E | undefined;
    isErr(): boolean;
    map<U>(op: (value: T) => U): IResult<U, E>;
    mapErr<F>(op: (error: E) => F): IResult<T, F>;
    and<U>(res: IResult<U, E>): IResult<U, E>;
    andThen<U>(op: (value: T) => IResult<U, E>): IResult<U, E>;
    unwrap(): T;
    unwrapErr(): E;
    unwrapOr(otherwise: T): T;
    unwrapOrElse(otherwise: (error: E) => T): T;
}
/** Contains the error value. */
export declare class Err<T, E> implements IResult<T, E> {
    private value;
    constructor(v: E);
    ok(): T | undefined;
    isOk(): boolean;
    err(): E | undefined;
    isErr(): boolean;
    map<U>(op: (value: T) => U): IResult<U, E>;
    mapErr<F>(op: (error: E) => F): IResult<T, F>;
    and<U>(res: IResult<U, E>): IResult<U, E>;
    andThen<U>(op: (value: T) => IResult<U, E>): IResult<U, E>;
    unwrap(): T;
    unwrapErr(): E;
    unwrapOr(otherwise: T): T;
    unwrapOrElse(otherwise: (error: E) => T): T;
}