/**
 * Returns a random number in bijective base-26 form inclusively between "A" and the single bijective base-26 number input or between both bijective base-26 number inputs
 * @param {string} a string containing only uppercase letters
 * @param {string?} b Optional string containing only uppercase letters defaults to "A"
 * @returns {string} A value bijective base-26number string in the set [a to b] or ["A" to a]
 * @Example bb26Random("C") //"A"
 * @Example bb26Random("AZ", "BC") //"BB"
 * @Example bb26Random("S", "Q") //"R"
 */
export declare function bb26Random(a: string, b?: string): string;
/**
 * Returns a random number in bijective base-26 form inclusively between "1" and the single bijective base-26 number input or between both bijective base-26 number inputs
 * @param {number} a number greater than 1
 * @param {number?} b number greater than 1 defaults to 1
 * @returns {string} A bijective base-26 number string in the set [a to b] or ["A" to a]
 * @Example bb26Random("3") //"A"
 * @Example bb26Random(52, 55) //"BB"
 * @Example bb26Random(19, 24) //"R"
 */
export declare function numberbb26Random(a: number, b?: number): string;
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