/**
 * Deep-walk the incoming config and restore `${VAR}` references from the
 * pre-substitution parsed config wherever the resolved value matches.
 *
 * @param incoming - The resolved config about to be written
 * @param parsed - The pre-substitution parsed config (from the current file on disk)
 * @param env - Environment variables for verification
 * @returns A new config object with env var references restored where appropriate
 */
export declare function restoreEnvVarRefs(incoming: unknown, parsed: unknown, env?: NodeJS.ProcessEnv): unknown;