/**
 * Serialize env vars into `.env` file content, quoting/escaping values so the
 * file is safe to `source` and skipping keys that aren't valid shell
 * identifiers. Managed var names (platform-injected secrets whose values are
 * never exposed) are listed as comments so users know they exist without
 * round-tripping secrets into local files.
 */
export declare function serializeEnvFile(envVars: Record<string, string>, opts: {
    header: string;
    managedVarNames?: string[];
}): {
    content: string;
    written: number;
    skipped: number;
};
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