import { File } from "../file.js";
import { Tag } from "../tag.js";
import { ReadStyle } from "../toolkit/types.js";
import type { IOStream } from "../toolkit/ioStream.js";
import { ModProperties } from "./modProperties.js";
/**
 * ProTracker MOD file format handler.
 *
 * Title is at offset 0 (20 bytes). A 4-byte tag at offset 1080 identifies
 * the MOD variant and determines the number of channels and instruments.
 * Instrument names (22 bytes each, starting at offset 20) form the comment.
 */
export declare class ModFile extends File {
    /** Parsed tag holding title and instrument names as a comment. */
    private _tag;
    /** Parsed audio properties, or `null` if not yet read. */
    private _properties;
    /** Number of instruments in the file (15 for NoiseTracker, 31 otherwise). */
    private _instrumentCount;
    /**
     * Private constructor — use {@link ModFile.open} instead.
     * @param stream - The underlying I/O stream.
     */
    private constructor();
    /**
     * Open and parse a ProTracker MOD file.
     * @param stream - The I/O stream to read from.
     * @param readProperties - Whether to parse audio properties.
     * @param readStyle - Detail level for audio property parsing.
     * @returns A fully initialized {@link ModFile} instance.
     */
    static open(stream: IOStream, readProperties?: boolean, readStyle?: ReadStyle): Promise<ModFile>;
    /**
     * Check whether a stream contains a known ProTracker MOD file.
     * @param stream - The stream to inspect.
     * @returns `true` if the 4-byte MOD ID at offset 1080 is a known identifier.
     */
    static isSupported(stream: IOStream): Promise<boolean>;
    /** Returns the tag for this file. */
    tag(): Tag;
    /** Returns the audio properties, or `null` if not parsed. */
    audioProperties(): ModProperties | null;
    /**
     * Write the current tag data back to the file.
     * @returns `true` on success, `false` if the file is read-only.
     */
    save(): Promise<boolean>;
    /**
     * Parse the MOD file header, ID tag, and instrument names.
     * @param readProperties - Whether to populate audio properties.
     * @param readStyle - Detail level for audio property parsing.
     */
    private read;
}
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