/**
 * Represents the size of entropy in characters for different security levels
 */
export declare enum EntropyBits {
    Bits128 = 14,
    Bits160 = 21,
    Bits256 = 42
}
/**
 * Configuration options for API key generation and handling
 */
export interface Config {
    hyphens: boolean;
    entropySize: EntropyBits;
}
/**
 * Option function type for configuring API key behavior
 */
export type Option = (c: Config) => void;
/**
 * Constants used throughout the API key system
 */
export declare const Constants: {
    readonly KEY_LENGTH_WITH_HYPHENS: 31;
    readonly KEY_LENGTH_WITHOUT_HYPHENS: 28;
    readonly KEY_PART_LENGTH: 7;
    readonly KEY_HYPHEN_COUNT: 3;
    readonly KEY_PARTS_COUNT: 4;
    readonly UUID_LENGTH: 36;
    readonly CHECKSUM_LENGTH: 8;
    readonly ENTROPY_BYTES_MULTIPLIER: number;
    readonly INITIAL_ENTROPY_BYTES: 32;
};
/**
 * Configuration options for API key generation
 */
export declare const Options: {
    readonly With128BitEntropy: Option;
    readonly With160BitEntropy: Option;
    readonly With256BitEntropy: Option;
};
/**
 * Default configuration settings
 */
export declare const DefaultConfig: Config;