/**
 * Generates a random string of specified length
 * @param length - The length of the random string to generate
 * @returns Random string containing uppercase letters, lowercase letters, and numbers
 * @example
 * ```ts
 * const random = genRandomStr(10); // e.g., "aB3kF9mN2x"
 * ```
 */
export declare function genRandomStr(length: number): string;
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