import { type MhtmlHeaders } from "./headers.js";
export type { MhtmlHeaders };
/** a file that was encoded in MHTML format */
export interface MhtmlFile {
    /** the files's headers */
    headers: MhtmlHeaders;
    /** the file's content */
    content: Uint8Array;
}
/** The decoder of any Content-Transfer-Encoding
 *
 * @param lines - each line of raw bytes
 * @returns data - decoded lines
 */
export type Decoder = (lines: AsyncIterable<Uint8Array>) => AsyncIterable<Uint8Array>;
/** options for mhtml parsing */
export interface ParseOptions {
    /**
     * custom decoders keyed by (lowercased) Content-Transfer-Encoding
     *
     * Use these to handle an encoding the defaults don't, or to override one. A
     * {@link Decoder} turns the CRLF-split lines of a part into its decoded
     * bytes; the parser strips the CRLFs when splitting, so a passthrough decoder
     * re-emits them between lines:
     *
     * ```ts
     * const crlf = new Uint8Array([13, 10]);
     * const decoderOverrides = new Map([
     *   ["binary", async function* (lines) {
     *     let first = true;
     *     for await (const line of lines) {
     *       if (!first) yield crlf;
     *       first = false;
     *       yield line;
     *     }
     *   }],
     * ]);
     * ```
     */
    decoderOverrides?: Map<string, Decoder>;
}
/**
 * parse a readable stream into an async iterator of MHTML files
 *
 * decoderOverrides can be used to overwrite default encoders or specify your
 * own if a Content-Transfer-Encoding isn't handled properly
 */
export declare function parseMhtml(stream: AsyncIterable<Uint8Array>, { decoderOverrides }?: ParseOptions): AsyncIterableIterator<MhtmlFile>;