/**
 * Generates a cryptographically secure random string of the specified length.
 *
 * @param {number} len - Desired length of the resulting string.
 * @returns {string} A random Base64-encoded string truncated to the given length.
 *
 * @example
 * randomString(8); // "q3RfB2sZ"
 *
 */
export declare function randomString(len: number): string;
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