import { Readable } from 'stream';
export interface GenericFileData extends Record<string, unknown> {
    metadata?: Record<string, unknown>;
    content?: Record<string, unknown>;
    error?: Error;
}
/**
 * A general-purpose base class for extracting data from downloaded
 * files. It handles instantiating from a buffer or a filepath, while concrete
 * implementations are expected to supply `getAll()` aandmd `getData()` methods.
 * If a specific implementation also supports additional data, overriding the `getAll()`
 * method allows it to bundle its information for use.
 */
export declare abstract class GenericFile {
    /**
     * An array of mimetypes, or glob strings matching mimetype patterns, that
     * the class can read and parse.
     */
    static readonly mimeTypes: string[];
    static readonly extensions: string[];
    protected stream?: Readable;
    protected fileData?: Buffer;
    protected filePath?: string;
    constructor(file?: string | Buffer | Readable);
    getBuffer(): Promise<Buffer>;
    getStream(): Promise<Readable>;
    abstract getMetadata(): Promise<Record<string, unknown> | undefined>;
    abstract getContent(): Promise<Record<string, unknown> | undefined>;
    getAll(): Promise<GenericFileData>;
    protected streamToBuffer(stream: Readable): Promise<Buffer>;
}
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