/// <reference types="node" />
/**
 * Text generator.
 */
import { ChildProcessWithoutNullStreams } from 'child_process';
import { defer } from './utils';
interface Options {
    path: string;
    spawnArgs?: string[];
    onMessage: (message: string) => any;
    onStderr?: (err: string) => any;
    isReady?: (message: string) => boolean;
}
export declare const lib: string;
export declare class ModelWrapper {
    static readonly lib: string;
    process: ChildProcessWithoutNullStreams;
    ready: defer.Deferred<void> | null;
    down?: Error;
    private options;
    constructor(opts: Options);
    handleError(err: Error): never;
    private stderr;
    write(message: string): Promise<boolean>;
}
export declare class QueuedModelWrapper<T> extends ModelWrapper {
    private waiting;
    private taskId;
    private opts;
    constructor(opts: QueuedModelWrapper<T>['opts']);
    destroy(): void;
    private onMessage;
    handleError(err: Error): never;
    query(text: string, id?: number | null, raw?: boolean): Promise<T>;
}
export {};