/** Result returned by every reader */
export interface FileReadResult {
    content: string | null;
    encoding: 'utf8' | 'base64';
    mimeType: string;
    truncated: boolean;
}
/** A reader that handles a specific category of files */
export interface FileReader {
    maxSize: number;
    read(filePath: string, totalSize: number): Promise<FileReadResult>;
}
/** Register a reader for one or more file extensions (including the dot). */
export declare function registerReader(extensions: string[], reader: FileReader): void;
export declare const TEXT_EXTENSIONS: Set<string>;
export declare const TEXT_FILENAMES: Set<string>;
/** Main entry point — called by connection.ts handleReadFile. */
export declare function readFileForPreview(filePath: string, totalSize: number): Promise<FileReadResult & {
    fileName: string;
}>;