/** Error thrown when attempting to add a key that already exists in a map. */
export declare class KeyAlreadyExistsError extends Error {
    readonly key: string;
    constructor(key: string);
}
/** Error thrown when attempting to add a value that already exists in a map. */
export declare class ValueAlreadyExistsError extends Error {
    readonly value: string | number;
    constructor(value: string | number);
}
//# sourceMappingURL=errors.d.ts.map