export interface DynamicVariableOptions {
    min?: number;
    max?: number;
    format?: string;
    offset?: string;
}
/**
 * Generate a UUID v4
 */
export declare function generateGuid(): string;
/**
 * Generate Unix timestamp (seconds since epoch)
 */
export declare function generateTimestamp(): number;
/**
 * Generate random integer between min and max (inclusive)
 */
export declare function generateRandomInt(min?: number, max?: number): number;
/**
 * Generate datetime string in specified format
 * Supports ISO8601, RFC1123, and custom formats
 */
export declare function generateDatetime(format?: string, offset?: string): string;
/**
 * Generate local datetime string
 */
export declare function generateLocalDatetime(format?: string, offset?: string): string;
/**
 * Set the base directory for .env file lookup
 */
export declare function setDotenvBasePath(basePath: string): void;
/**
 * Get value from .env file
 */
export declare function getDotenvValue(key: string): string | undefined;
/**
 * Get value from process environment
 */
export declare function getProcessEnvValue(key: string): string | undefined;
/**
 * Process dynamic variables in a string
 * Supports REST Client compatible syntax:
 * - {{$guid}}
 * - {{$timestamp}}
 * - {{$randomInt min max}}
 * - {{$datetime format offset}}
 * - {{$localDatetime format offset}}
 * - {{$dotenv VARIABLE_NAME}}
 * - {{$processEnv VARIABLE_NAME}}
 */
export declare function processDynamicVariables(content: string): string;
/**
 * Clear the dotenv cache (useful for testing)
 */
export declare function clearDotenvCache(): void;