/**
 * Environment Variable Support — resolve ${VAR} from process.env and .env files.
 */
/**
 * Parse a .env file into a key-value map.
 */
export declare function parseEnvFile(filePath: string): Record<string, string>;
/**
 * Resolve ${VAR} references in a string using process.env and optional extra env.
 */
export declare function resolveEnvVars(value: string, extraEnv?: Record<string, string>): string;
/**
 * Resolve env vars in a Record<string, string>.
 */
export declare function resolveEnvRecord(env: Record<string, string>, extraEnv?: Record<string, string>): Record<string, string>;
/**
 * Apply env vars to process.env, returning backup for restore.
 */
export declare function applyEnv(env: Record<string, string>): Record<string, string | undefined>;
/**
 * Restore process.env from backup.
 */
export declare function restoreProcessEnv(backup: Record<string, string | undefined>): void;
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