/**
 * Minimal `multipart/form-data` parser (RFC 7578 / RFC 2046).
 *
 * Handles the subset needed by the import-file upload endpoint:
 * - A single file part with `Content-Disposition: form-data; name="file"; filename="..."`
 *   and an optional `Content-Type` header. The part body is captured as raw bytes.
 * - Zero or more text parts with `Content-Disposition: form-data; name="..."` and a
 *   utf-8 string body.
 *
 * Deliberate non-features (out of scope for V10.0):
 * - Nested multipart bodies (`multipart/mixed` inside a part)
 * - `Content-Transfer-Encoding: base64` / `quoted-printable` (browsers don't send these)
 * - Streaming — we parse a fully-buffered `Buffer`, which is the shape daemon.ts
 *   already has from `readBody`
 * - Charset negotiation on text parts — everything non-file is treated as utf-8
 *
 * Throws `MultipartParseError` on malformed input so the route handler can
 * return a clean 400 to the caller.
 */
export declare class MultipartParseError extends Error {
    constructor(message: string);
}
export interface MultipartField {
    /** `name` attribute from the `Content-Disposition` header. */
    name: string;
    /** `filename` attribute, if the part is a file upload. Undefined for text parts. */
    filename?: string;
    /** `Content-Type` header of the part, or undefined if not provided. */
    contentType?: string;
    /** Raw part body as bytes. For text parts, caller can decode via `.toString('utf-8')`. */
    content: Buffer;
}
/**
 * Extract the boundary token from a `Content-Type: multipart/form-data; boundary=...` header.
 * Returns null if the header is missing, malformed, ambiguous, or not multipart/form-data.
 *
 * Accepts the full `IncomingHttpHeaders['content-type']` shape (`string | string[] | undefined`)
 * so that callers can pass `req.headers['content-type']` directly. Array values — which Node
 * can deliver when a client sends duplicated Content-Type headers — are rejected as ambiguous
 * rather than coerced, so the route handler returns a clean 400 instead of crashing inside
 * `.toLowerCase()`.
 */
export declare function parseBoundary(contentTypeHeader: string | string[] | undefined): string | null;
/**
 * Parse a fully-buffered `multipart/form-data` body into its constituent fields.
 * `boundary` is the boundary token (without the leading `--`).
 */
export declare function parseMultipart(body: Buffer, boundary: string): MultipartField[];
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