/**
 * Generates a random string matching a template pattern.
 *
 * @param template - Pattern template where:
 *                   - '#' represents a random digit (0-9)
 *                   - 'A' represents a random uppercase letter (A-Z)
 *                   - 'a' represents a random lowercase letter (a-z)
 *                   - Any other character is preserved as-is
 * @returns A random string matching the template pattern.
 *
 * @throws {Error} If template is empty.
 * @throws {Error} If template is longer than 100 characters.
 *
 * @example
 * // Generate phone number pattern
 * randomPattern('###-###-####'); // '555-123-4567'
 *
 * @example
 * // Generate license plate pattern
 * randomPattern('AAA-###'); // 'XYZ-742'
 *
 * @example
 * // Generate product code
 * randomPattern('PROD-####-aaa'); // 'PROD-8472-xyz'
 *
 * @example
 * // Mixed pattern with preserved characters
 * randomPattern('ID: AAA-###-aaa'); // 'ID: KLM-389-def'
 *
 * @note Uses Math.random() for non-cryptographic randomness.
 * @note Pattern characters: '#' (digit), 'A' (uppercase), 'a' (lowercase).
 * @note All other characters in the template are preserved exactly.
 *
 * @complexity Time: O(n), Space: O(n) where n is template length
 */
export declare function randomPattern(template: string): string;
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