/// <reference types="node" />
/// <reference types="node" />
export declare const VERSION = "5.3";
import { EventEmitter } from "events";
import { Channels } from "@nteract/messaging";
import { SyncDB } from "@cocalc/sync/editor/db/sync";
import { ExecOpts, KernelInfo, CodeExecutionEmitterInterface } from "@cocalc/frontend/jupyter/project-interface";
import { CodeExecutionEmitter } from "./execute-code";
import { JupyterKernelInterface } from "@cocalc/frontend/jupyter/project-interface";
export declare function jupyter_backend(syncdb: SyncDB, client: any): void;
export declare function remove_jupyter_backend(path: string, project_id: string): Promise<void>;
interface KernelParams {
    name: string;
    path: string;
    actions?: any;
}
export declare function kernel(opts: KernelParams): JupyterKernel;
export declare class JupyterKernel extends EventEmitter implements JupyterKernelInterface {
    name: string;
    store: any;
    readonly identity: string;
    private stderr;
    private _path;
    private _actions?;
    private _state;
    private _directory;
    private _filename;
    private _kernel;
    private _kernel_info;
    _execute_code_queue: CodeExecutionEmitter[];
    channel?: Channels;
    private has_ensured_running;
    constructor(name: any, _path: any, _actions: any);
    get_path(): string;
    private _set_state;
    get_state(): string;
    spawn(spawn_opts?: any): Promise<void>;
    get_spawned_kernel(): any;
    get_connection_file(): string | undefined;
    private finish_spawn;
    _get_kernel_info(): Promise<void>;
    signal(signal: string): void;
    close(): Promise<void>;
    dbg(f: string): Function;
    low_level_dbg(): void;
    private ensure_running;
    execute_code(opts: ExecOpts): CodeExecutionEmitterInterface;
    cancel_execute(id: string): void;
    _process_execute_code_queue(): Promise<void>;
    clear_execute_code_queue(): void;
    execute_code_now(opts: ExecOpts): Promise<object[]>;
    get_blob_store(): import("./jupyter-blobs-sqlite").BlobStore | undefined;
    process_output(content: any): void;
    call(msg_type: string, content?: any): Promise<any>;
    complete(opts: {
        code: any;
        cursor_pos: any;
    }): Promise<any>;
    introspect(opts: {
        code: any;
        cursor_pos: any;
        detail_level: any;
    }): Promise<any>;
    kernel_info(): Promise<KernelInfo>;
    save_ipynb_file(): Promise<void>;
    more_output(id: string): any[];
    nbconvert(args: string[], timeout?: number): Promise<void>;
    load_attachment(path: string): Promise<string>;
    process_attachment(base64: any, mime: any): string | undefined;
    process_comm_message_from_kernel(mesg: any): void;
    ipywidgetsGetBuffer(model_id: string, buffer_path: string): Buffer | undefined;
    send_comm_message_to_kernel(msg_id: string, comm_id: string, data: any): void;
}
export declare function get_existing_kernel(path: string): JupyterKernel | undefined;
export declare function get_kernel_by_pid(pid: number): JupyterKernel | undefined;
export {};