@jupyterlab/services/lib/kernel/kernel.d.ts

import { IIterator } from '@lumino/algorithm';
import { JSONObject, JSONValue } from '@lumino/coreutils';
import { IDisposable, IObservableDisposable } from '@lumino/disposable';
import { ISignal } from '@lumino/signaling';
import { ServerConnection } from '..';
import * as KernelMessage from './messages';
import { KernelSpec } from '../kernelspec';
import { IManager as IBaseManager } from '../basemanager';
import { IKernelOptions, IModel } from './restapi';
export { Status } from './messages';
export { IModel, IKernelOptions };
/**
 * Interface of a Kernel connection that is managed by a session.
 *
 * #### Notes
 * The Kernel object is tied to the lifetime of the Kernel id, which is a
 * unique id for the Kernel session on the server.  The Kernel object manages
 * a websocket connection internally, and will auto-restart if the websocket
 * temporarily loses connection.  Restarting creates a new Kernel process on
 * the server, but preserves the Kernel id.
 *
 * The IKernelConnection is notably missing the full IKernel signals. This
 * interface is for situations where a kernel may change, but we want a user
 * to not have to worry about disconnecting and reconnecting signals when a
 * kernel is swapped. The object that maintains an IKernel, but only provides
 * a user with an IKernelConnection should proxy the appropriate IKernel
 * signals for the user with its own signals. The advantage is that when the
 * kernel is changed, the object itself can take care of disconnecting and
 * reconnecting listeners.
 */
export interface IKernelConnection extends IObservableDisposable {
    /**
     * The id of the server-side kernel.
     */
    readonly id: string;
    /**
     * The name of the server-side kernel.
     */
    readonly name: string;
    /**
     * The kernel model, for convenience.
     */
    readonly model: IModel;
    /**
     * The client username.
     */
    readonly username: string;
    /**
     * The client unique id.
     *
     * #### Notes
     * This should be unique for a particular kernel connection object.
     */
    readonly clientId: string;
    /**
     * The current status of the kernel.
     */
    readonly status: KernelMessage.Status;
    /**
     * The current connection status of the kernel.
     */
    readonly connectionStatus: ConnectionStatus;
    /**
     * The kernel info
     *
     * #### Notes
     * This promise only resolves at startup, and is not refreshed on every
     * restart.
     */
    readonly info: Promise<KernelMessage.IInfoReply>;
    /**
     * Get the kernel spec.
     *
     * @returns A promise that resolves with the kernel spec for this kernel.
     *
     * #### Notes
     * This may make a server request to retrieve the spec.
     */
    readonly spec: Promise<KernelSpec.ISpecModel | undefined>;
    /**
     * Whether the kernel connection handles comm messages.
     *
     * #### Notes
     * The comm message protocol currently has implicit assumptions that only
     * one kernel connection is handling comm messages. This option allows a
     * kernel connection to opt out of handling comms.
     *
     * See https://github.com/jupyter/jupyter_client/issues/263
     */
    handleComms: boolean;
    /**
     * Whether the kernel connection has pending input.
     *
     * #### Notes
     * This is a guard to avoid deadlock is the user asks input
     * as second time before submitting his first input
     */
    hasPendingInput: boolean;
    /**
     * Send a shell message to the kernel.
     *
     * @param msg - The fully-formed shell message to send.
     *
     * @param expectReply - Whether to expect a shell reply message.
     *
     * @param disposeOnDone - Whether to dispose of the future when done.
     *
     * #### Notes
     * Send a message to the kernel's shell channel, yielding a future object
     * for accepting replies.
     *
     * If `expectReply` is given and `true`, the future is done when both a
     * shell reply and an idle status message are received with the appropriate
     * parent header, in which case the `.done` promise resolves to the reply.
     * If `expectReply` is not given or is `false`, the future is done when an
     * idle status message with the appropriate parent header is received, in
     * which case the `.done` promise resolves to `undefined`.
     *
     * If `disposeOnDone` is given and `false`, the future will not be disposed
     * of when the future is done, instead relying on the caller to dispose of
     * it. This allows for the handling of out-of-order output from ill-behaved
     * kernels.
     *
     * All replies are validated as valid kernel messages.
     *
     * If the kernel status is `'dead'`, this will throw an error.
     */
    sendShellMessage<T extends KernelMessage.ShellMessageType>(msg: KernelMessage.IShellMessage<T>, expectReply?: boolean, disposeOnDone?: boolean): IShellFuture<KernelMessage.IShellMessage<T>>;
    sendControlMessage<T extends KernelMessage.ControlMessageType>(msg: KernelMessage.IControlMessage<T>, expectReply?: boolean, disposeOnDone?: boolean): IControlFuture<KernelMessage.IControlMessage<T>>;
    /**
     * Reconnect to a disconnected kernel.
     *
     * @returns A promise that resolves when the kernel has reconnected.
     *
     * #### Notes
     * This just refreshes the connection to an existing kernel, and does not
     * perform an HTTP request to the server or restart the kernel.
     */
    reconnect(): Promise<void>;
    /**
     * Interrupt a kernel.
     *
     * @returns A promise that resolves when the kernel has interrupted.
     *
     * #### Notes
     * Uses the [Jupyter Notebook API](http://petstore.swagger.io/?url=https://raw.githubusercontent.com/jupyter/notebook/master/notebook/services/api/api.yaml#!/kernels).
     *
     * The promise is fulfilled on a valid response and rejected otherwise.
     *
     * It is assumed that the API call does not mutate the kernel id or name.
     *
     * The promise will be rejected if the kernel status is `'dead'` or if the
     * request fails or the response is invalid.
     */
    interrupt(): Promise<void>;
    /**
     * Restart a kernel.
     *
     * @returns A promise that resolves when the kernel has restarted.
     *
     * #### Notes
     * Uses the [Jupyter Notebook API](http://petstore.swagger.io/?url=https://raw.githubusercontent.com/jupyter/notebook/master/notebook/services/api/api.yaml#!/kernels) and validates the response model.
     *
     * Any existing Future or Comm objects are cleared.
     *
     * It is assumed that the API call does not mutate the kernel id or name.
     *
     * The promise will be rejected if the kernel status is `'dead'` or if the
     * request fails or the response is invalid.
     */
    restart(): Promise<void>;
    /**
     * Send a `kernel_info_request` message.
     *
     * @param content - The content of the request.
     *
     * @returns A promise that resolves with the response message.
     *
     * #### Notes
     * See [Messaging in Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#kernel-info).
     *
     * Fulfills with the `kernel_info_response` content when the shell reply is
     * received and validated.
     */
    requestKernelInfo(): Promise<KernelMessage.IInfoReplyMsg | undefined>;
    /**
     * Send a `complete_request` message.
     *
     * @param content - The content of the request.
     *
     * @returns A promise that resolves with the response message.
     *
     * #### Notes
     * See [Messaging in Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#completion).
     *
     * Fulfills with the `complete_reply` content when the shell reply is
     * received and validated.
     */
    requestComplete(content: KernelMessage.ICompleteRequestMsg['content']): Promise<KernelMessage.ICompleteReplyMsg>;
    /**
     * Send an `inspect_request` message.
     *
     * @param content - The content of the request.
     *
     * @returns A promise that resolves with the response message.
     *
     * #### Notes
     * See [Messaging in Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#introspection).
     *
     * Fulfills with the `inspect_reply` content when the shell reply is
     * received and validated.
     */
    requestInspect(content: KernelMessage.IInspectRequestMsg['content']): Promise<KernelMessage.IInspectReplyMsg>;
    /**
     * Send a `history_request` message.
     *
     * @param content - The content of the request.
     *
     * @returns A promise that resolves with the response message.
     *
     * #### Notes
     * See [Messaging in Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#history).
     *
     * Fulfills with the `history_reply` content when the shell reply is
     * received and validated.
     */
    requestHistory(content: KernelMessage.IHistoryRequestMsg['content']): Promise<KernelMessage.IHistoryReplyMsg>;
    /**
     * Send an `execute_request` message.
     *
     * @param content - The content of the request.
     *
     * @param disposeOnDone - Whether to dispose of the future when done.
     *
     * @returns A kernel future.
     *
     * #### Notes
     * See [Messaging in
     * Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#execute).
     *
     * This method returns a kernel future, rather than a promise, since execution may
     * have many response messages (for example, many iopub display messages).
     *
     * Future `onReply` is called with the `execute_reply` content when the
     * shell reply is received and validated.
     *
     * **See also:** [[IExecuteReply]]
     */
    requestExecute(content: KernelMessage.IExecuteRequestMsg['content'], disposeOnDone?: boolean, metadata?: JSONObject): IShellFuture<KernelMessage.IExecuteRequestMsg, KernelMessage.IExecuteReplyMsg>;
    /**
     * Send an experimental `debug_request` message.
     *
     * @hidden
     *
     * @param content - The content of the request.
     *
     * @param disposeOnDone - Whether to dispose of the future when done.
     *
     * @returns A kernel future.
     *
     * #### Notes
     * Debug messages are experimental messages that are not in the official
     * kernel message specification. As such, this function is *NOT* considered
     * part of the public API, and may change without notice.
     */
    requestDebug(content: KernelMessage.IDebugRequestMsg['content'], disposeOnDone?: boolean): IControlFuture<KernelMessage.IDebugRequestMsg, KernelMessage.IDebugReplyMsg>;
    /**
     * Send an `is_complete_request` message.
     *
     * @param content - The content of the request.
     *
     * @returns A promise that resolves with the response message.
     *
     * #### Notes
     * See [Messaging in Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#code-completeness).
     *
     * Fulfills with the `is_complete_response` content when the shell reply is
     * received and validated.
     */
    requestIsComplete(content: KernelMessage.IIsCompleteRequestMsg['content']): Promise<KernelMessage.IIsCompleteReplyMsg>;
    /**
     * Send a `comm_info_request` message.
     *
     * @param content - The content of the request.
     *
     * @returns A promise that resolves with the response message.
     *
     * #### Notes
     * See [Messaging in Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#comm_info).
     *
     * Fulfills with the `comm_info_reply` content when the shell reply is
     * received and validated.
     */
    requestCommInfo(content: KernelMessage.ICommInfoRequestMsg['content']): Promise<KernelMessage.ICommInfoReplyMsg>;
    /**
     * Send an `input_reply` message.
     *
     * @param content - The content of the reply.
     * @param parent_header - The parent message header.
     *
     * #### Notes
     * See [Messaging in Jupyter](https://jupyter-client.readthedocs.io/en/latest/messaging.html#messages-on-the-stdin-router-dealer-sockets).
     * In v7.0.0, the `parent_header` argument will become mandatory.
     */
    sendInputReply(content: KernelMessage.IInputReplyMsg['content'], parent_header?: KernelMessage.IInputReplyMsg['parent_header']): void;
    /**
     * Create a new comm.
     *
     * @param targetName - The name of the comm target.
     *
     * @param id - The comm id.
     *
     * @returns A comm instance.
     */
    createComm(targetName: string, commId?: string): IComm;
    /**
     * Check if a comm exists.
     */
    hasComm(commId: string): boolean;
    /**
     * Register a comm target handler.
     *
     * @param targetName - The name of the comm target.
     *
     * @param callback - The callback invoked for a comm open message.
     *
     * #### Notes
     * Only one comm target can be registered to a target name at a time, an
     * existing callback for the same target name will be overridden.  A registered
     * comm target handler will take precedence over a comm which specifies a
     * `target_module`.
     *
     * If the callback returns a promise, kernel message processing will pause
     * until the returned promise is fulfilled.
     */
    registerCommTarget(targetName: string, callback: (comm: IComm, msg: KernelMessage.ICommOpenMsg) => void | PromiseLike<void>): void;
    /**
     * Remove a comm target handler.
     *
     * @param targetName - The name of the comm target to remove.
     *
     * @param callback - The callback to remove.
     *
     * #### Notes
     * The comm target is only removed if it matches the callback argument.
     */
    removeCommTarget(targetName: string, callback: (comm: IComm, msg: KernelMessage.ICommOpenMsg) => void | PromiseLike<void>): void;
    /**
     * Register an IOPub message hook.
     *
     * @param msg_id - The parent_header message id in messages the hook should
     * intercept.
     *
     * @param hook - The callback invoked for the message.
     *
     * #### Notes
     * The IOPub hook system allows you to preempt the handlers for IOPub
     * messages with a given parent_header message id. The most recently
     * registered hook is run first. If a hook return value resolves to false,
     * any later hooks and the future's onIOPub handler will not run. If a hook
     * throws an error, the error is logged to the console and the next hook is
     * run. If a hook is registered during the hook processing, it will not run
     * until the next message. If a hook is disposed during the hook processing,
     * it will be deactivated immediately.
     *
     * See also [[IFuture.registerMessageHook]].
     */
    registerMessageHook(msgId: string, hook: (msg: KernelMessage.IIOPubMessage) => boolean | PromiseLike<boolean>): void;
    /**
     * Remove an IOPub message hook.
     *
     * @param msg_id - The parent_header message id the hook intercepted.
     *
     * @param hook - The callback invoked for the message.
     *
     */
    removeMessageHook(msgId: string, hook: (msg: KernelMessage.IIOPubMessage) => boolean | PromiseLike<boolean>): void;
    /**
     * Remove the input guard, if any.
     */
    removeInputGuard(): void;
    /**
     * A signal emitted when the kernel status changes.
     */
    statusChanged: ISignal<this, KernelMessage.Status>;
    /**
     * A signal emitted when the kernel connection status changes.
     */
    connectionStatusChanged: ISignal<this, ConnectionStatus>;
    /**
     * A signal emitted after an iopub kernel message is handled.
     */
    iopubMessage: ISignal<this, KernelMessage.IIOPubMessage>;
    /**
     * A signal emitted for unhandled non-iopub kernel messages that claimed to
     * be responses for messages we sent using this kernel object.
     */
    unhandledMessage: ISignal<this, KernelMessage.IMessage>;
    /**
     * A signal emitted when any kernel message is sent or received.
     *
     * #### Notes
     * This signal is emitted before any message handling has happened. The
     * message should be treated as read-only.
     */
    anyMessage: ISignal<this, IAnyMessageArgs>;
    /**
     * A signal emitted when a kernel has pending inputs from the user.
     */
    pendingInput: ISignal<this, boolean>;
    /**
     * The server settings for the kernel.
     */
    readonly serverSettings: ServerConnection.ISettings;
    /**
     * Shutdown a kernel.
     *
     * @returns A promise that resolves when the kernel has shut down.
     *
     * #### Notes
     * Uses the [Jupyter Notebook
     * API](http://petstore.swagger.io/?url=https://raw.githubusercontent.com/jupyter/notebook/master/notebook/services/api/api.yaml#!/kernels).
     *
     * On a valid response, closes the websocket, disposes of the kernel
     * object, and fulfills the promise.
     *
     * The promise will be rejected if the kernel status is `'dead'`, the
     * request fails, or the response is invalid.
     */
    shutdown(): Promise<void>;
    /**
     * Clone the current kernel with a new clientId.
     */
    clone(options?: Pick<IKernelConnection.IOptions, 'clientId' | 'username' | 'handleComms'>): IKernelConnection;
}
/**
 * The namespace for `IKernelConnection` statics.
 */
export declare namespace IKernelConnection {
    /**
     * The options object used to initialize a kernel.
     */
    interface IOptions {
        /**
         * The kernel model.
         */
        model: IModel;
        /**
         * The server settings for the kernel.
         */
        serverSettings?: ServerConnection.ISettings;
        /**
         * The username of the kernel client.
         */
        username?: string;
        /**
         * Whether the kernel connection should handle comm messages
         *
         * #### Notes
         * The comm message protocol currently has implicit assumptions that only
         * one kernel connection is handling comm messages. This option allows a
         * kernel connection to opt out of handling comms.
         *
         * See https://github.com/jupyter/jupyter_client/issues/263
         */
        handleComms?: boolean;
        /**
         * The unique identifier for the kernel client.
         */
        clientId?: string;
    }
}
/**
 * Object which manages kernel instances for a given base url.
 *
 * #### Notes
 * The manager is responsible for maintaining the state of running kernels
 * through polling the server. Use a manager if you want to be notified of
 * changes to kernels.
 */
export interface IManager extends IBaseManager {
    /**
     * A signal emitted when the running kernels change.
     */
    runningChanged: ISignal<IManager, IModel[]>;
    /**
     * A signal emitted when there is a server API connection failure.
     */
    connectionFailure: ISignal<IManager, ServerConnection.NetworkError>;
    /**
     * Whether the manager is ready.
     */
    readonly isReady: boolean;
    /**
     * A promise that resolves when the manager is initially ready.
     */
    readonly ready: Promise<void>;
    /**
     * Create an iterator over the known running kernels.
     *
     * @returns A new iterator over the running kernels.
     */
    running(): IIterator<IModel>;
    /**
     * Force a refresh of the running kernels.
     *
     * @returns A promise that resolves when the models are refreshed.
     *
     * #### Notes
     * This is intended to be called only in response to a user action,
     * since the manager maintains its internal state.
     */
    refreshRunning(): Promise<void>;
    /**
     * Start a new kernel.
     *
     * @param createOptions - The kernel creation options
     *
     * @param connectOptions - The kernel connection options
     *
     * @returns A promise that resolves with the kernel connection.
     *
     * #### Notes
     * The manager `serverSettings` will be always be used.
     */
    startNew(createOptions?: IKernelOptions, connectOptions?: Omit<IKernelConnection.IOptions, 'model' | 'serverSettings'>): Promise<IKernelConnection>;
    /**
     * Find a kernel by id.
     *
     * @param id - The id of the target kernel.
     *
     * @returns A promise that resolves with the kernel's model, or undefined if not found.
     */
    findById(id: string): Promise<IModel | undefined>;
    /**
     * Connect to an existing kernel.
     *
     * @param model - The model of the target kernel.
     *
     * @returns A promise that resolves with the new kernel instance.
     */
    connectTo(options: IKernelConnection.IOptions): IKernelConnection;
    /**
     * Shut down a kernel by id.
     *
     * @param id - The id of the target kernel.
     *
     * @returns A promise that resolves when the operation is complete.
     */
    shutdown(id: string): Promise<void>;
    /**
     * Shut down all kernels.
     *
     * @returns A promise that resolves when all of the kernels are shut down.
     */
    shutdownAll(): Promise<void>;
}
/**
 * A Future interface for responses from the kernel.
 *
 * When a message is sent to a kernel, a Future is created to handle any
 * responses that may come from the kernel.
 */
export interface IFuture<REQUEST extends KernelMessage.IShellControlMessage, REPLY extends KernelMessage.IShellControlMessage> extends IDisposable {
    /**
     * The original outgoing message.
     */
    readonly msg: REQUEST;
    /**
     * A promise that resolves when the future is done.
     *
     * #### Notes
     * The future is done when there are no more responses expected from the
     * kernel.
     *
     * The `done` promise resolves to the reply message.
     */
    readonly done: Promise<REPLY>;
    /**
     * The reply handler for the kernel future.
     *
     * #### Notes
     * If the handler returns a promise, all kernel message processing pauses
     * until the promise is resolved. If there is a reply message, the future
     * `done` promise also resolves to the reply message after this handler has
     * been called.
     */
    onReply: (msg: REPLY) => void | PromiseLike<void>;
    /**
     * The iopub handler for the kernel future.
     *
     * #### Notes
     * If the handler returns a promise, all kernel message processing pauses
     * until the promise is resolved.
     */
    onIOPub: (msg: KernelMessage.IIOPubMessage) => void | PromiseLike<void>;
    /**
     * The stdin handler for the kernel future.
     *
     * #### Notes
     * If the handler returns a promise, all kernel message processing pauses
     * until the promise is resolved.
     */
    onStdin: (msg: KernelMessage.IStdinMessage) => void | PromiseLike<void>;
    /**
     * Register hook for IOPub messages.
     *
     * @param hook - The callback invoked for an IOPub message.
     *
     * #### Notes
     * The IOPub hook system allows you to preempt the handlers for IOPub
     * messages handled by the future.
     *
     * The most recently registered hook is run first. A hook can return a
     * boolean or a promise to a boolean, in which case all kernel message
     * processing pauses until the promise is fulfilled. If a hook return value
     * resolves to false, any later hooks will not run and the function will
     * return a promise resolving to false. If a hook throws an error, the error
     * is logged to the console and the next hook is run. If a hook is
     * registered during the hook processing, it will not run until the next
     * message. If a hook is removed during the hook processing, it will be
     * deactivated immediately.
     */
    registerMessageHook(hook: (msg: KernelMessage.IIOPubMessage) => boolean | PromiseLike<boolean>): void;
    /**
     * Remove a hook for IOPub messages.
     *
     * @param hook - The hook to remove.
     *
     * #### Notes
     * If a hook is removed during the hook processing, it will be deactivated immediately.
     */
    removeMessageHook(hook: (msg: KernelMessage.IIOPubMessage) => boolean | PromiseLike<boolean>): void;
    /**
     * Send an `input_reply` message.
     */
    sendInputReply(content: KernelMessage.IInputReplyMsg['content'], parent_header?: KernelMessage.IInputReplyMsg['parent_header']): void;
}
export interface IShellFuture<REQUEST extends KernelMessage.IShellMessage = KernelMessage.IShellMessage, REPLY extends KernelMessage.IShellMessage = KernelMessage.IShellMessage> extends IFuture<REQUEST, REPLY> {
}
export interface IControlFuture<REQUEST extends KernelMessage.IControlMessage = KernelMessage.IControlMessage, REPLY extends KernelMessage.IControlMessage = KernelMessage.IControlMessage> extends IFuture<REQUEST, REPLY> {
}
/**
 * A client side Comm interface.
 */
export interface IComm extends IDisposable {
    /**
     * The unique id for the comm channel.
     */
    readonly commId: string;
    /**
     * The target name for the comm channel.
     */
    readonly targetName: string;
    /**
     * Callback for a comm close event.
     *
     * #### Notes
     * This is called when the comm is closed from either the server or client.
     * If this is called in response to a kernel message and the handler returns
     * a promise, all kernel message processing pauses until the promise is
     * resolved.
     */
    onClose: (msg: KernelMessage.ICommCloseMsg) => void | PromiseLike<void>;
    /**
     * Callback for a comm message received event.
     *
     * #### Notes
     * If the handler returns a promise, all kernel message processing pauses
     * until the promise is resolved.
     */
    onMsg: (msg: KernelMessage.ICommMsgMsg) => void | PromiseLike<void>;
    /**
     * Open a comm with optional data and metadata.
     *
     * @param data - The data to send to the server on opening.
     *
     * @param metadata - Additional metadata for the message.
     *
     * @returns A future for the generated message.
     *
     * #### Notes
     * This sends a `comm_open` message to the server.
     */
    open(data?: JSONValue, metadata?: JSONObject, buffers?: (ArrayBuffer | ArrayBufferView)[]): IShellFuture;
    /**
     * Send a `comm_msg` message to the kernel.
     *
     * @param data - The data to send to the server on opening.
     *
     * @param metadata - Additional metadata for the message.
     *
     * @param buffers - Optional buffer data.
     *
     * @param disposeOnDone - Whether to dispose of the future when done.
     *
     * @returns A future for the generated message.
     *
     * #### Notes
     * This is a no-op if the comm has been closed.
     */
    send(data: JSONValue, metadata?: JSONObject, buffers?: (ArrayBuffer | ArrayBufferView)[], disposeOnDone?: boolean): IShellFuture;
    /**
     * Close the comm.
     *
     * @param data - The data to send to the server on opening.
     *
     * @param metadata - Additional metadata for the message.
     *
     * @returns A future for the generated message.
     *
     * #### Notes
     * This will send a `comm_close` message to the kernel, and call the
     * `onClose` callback if set.
     *
     * This is a no-op if the comm is already closed.
     */
    close(data?: JSONValue, metadata?: JSONObject, buffers?: (ArrayBuffer | ArrayBufferView)[]): IShellFuture;
}
/**
 * The valid kernel connection states.
 *
 * #### Notes
 * The status states are:
 * * `connected`: The kernel connection is live.
 * * `connecting`: The kernel connection is not live, but we are attempting
 *   to reconnect to the kernel.
 * * `disconnected`: The kernel connection is permanently down, we will not
 *   try to reconnect.
 *
 * When a kernel connection is `connected`, the kernel status should be
 * valid. When a kernel connection is either `connecting` or `disconnected`,
 * the kernel status will be `unknown` unless the kernel status was `dead`,
 * in which case it stays `dead`.
 */
export declare type ConnectionStatus = 'connected' | 'connecting' | 'disconnected';
/**
 * Arguments interface for the anyMessage signal.
 */
export interface IAnyMessageArgs {
    /**
     * The message that is being signaled.
     */
    msg: Readonly<KernelMessage.IMessage>;
    /**
     * The direction of the message.
     */
    direction: 'send' | 'recv';
}