/**
 * Utility for environment variable interpolation in configuration strings
 * Supports ${VAR_NAME} and ${VAR_NAME:-default} syntax
 */
/**
 * Interpolate environment variables in a string
 * Replaces ${VAR_NAME} with the value of the environment variable
 * Supports default values with ${VAR_NAME:-default} syntax
 *
 * @param input String with environment variable references
 * @returns String with environment variables interpolated
 */
export declare function interpolateEnvVars(input: string): string;
/**
 * Interpolate environment variables in an object recursively
 * Processes all string values in the object
 *
 * @param obj Object with potential environment variable references
 * @returns Object with environment variables interpolated
 */
export declare function interpolateEnvVarsInObject<T>(obj: T): T;