/**
 * Loads environment variables from .env.mpesajs or falls back to .env
 * @returns The loaded environment variables
 */
export declare function loadEnvVariables(): NodeJS.ProcessEnv;
/**
 * Gets an environment variable with a fallback value
 * Returns the raw string value, allowing the importing file to handle parsing
 * @param key The environment variable key
 * @param defaultValue The default value if the environment variable is not set
 * @returns The environment variable value as a string or the default value
 */
export declare function getEnvVar(key: string, defaultValue: string): string;
/**
 * Gets a numeric environment variable with a fallback value
 * @param key The environment variable key
 * @param defaultValue The default value if the environment variable is not set
 * @returns The parsed numeric value or the default value
 */
export declare function getNumericEnvVar(key: string, defaultValue: number): number;
/**
 * Gets a boolean environment variable with a fallback value
 * @param key The environment variable key
 * @param defaultValue The default value if the environment variable is not set
 * @returns The parsed boolean value or the default value
 */
export declare function getBooleanEnvVar(key: string, defaultValue: boolean): boolean;