export declare abstract class Builder {
    project_dir: string;
    style_dirs: string[];
    abstract ownsFile(file_path: string): boolean;
    abstract getName(): string;
    abstract _build(): Promise<void>;
    abstract dispose(): Promise<void>;
    constructor(project_dir: string, style_dirs: string[]);
    ongoing_build: Promise<void> | null;
    build(notifier?: (message: string) => void): Promise<void>;
}