/**
 * Generates a random base64 string of approximately specified length.
 *
 * @param length - The approximate length of the base64 string.
 * @returns A random base64 string.
 *
 * @throws {Error} If length is NaN.
 * @throws {Error} If length is negative or not an integer.
 *
 * @example
 * // Generate base64 string
 * randomBase64(16); // 'a3F9kL2pQwX5tYzN'
 *
 * @example
 * // Generate base64 token
 * randomBase64(32); // 'bG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ='
 *
 * @note Uses Math.random() for non-cryptographic randomness.
 * @note Actual length may vary slightly due to base64 encoding (4:3 ratio).
 * @note For cryptographic randomness, use generateRandomBytes from cryptoFunctions.
 *
 * @complexity Time: O(n), Space: O(n) where n is length
 */
export declare function randomBase64(length: number): string;
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