export declare const BASE_62_DIGITS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
export declare const BASE_52_DIGITS: string;
/**
 * Generates a key that sorts between `a` and `b`. A null bound represents
 * either end of the ordered range. Non-null bounds may be passed in either
 * order.
 */
export declare function generateKeyBetween(a: string | null | undefined, b: string | null | undefined, digits?: string | undefined, intDigits?: string | undefined): string;
/**
 * Generates `n` distinct, sorted keys between the two bounds.
 */
export declare function generateNKeysBetween(a: string | null | undefined, b: string | null | undefined, n: number, digits?: string | undefined, intDigits?: string | undefined): string[];
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