import type { Action } from "@vertigis/arcgis-extensions/support/Action";
import type { Command } from "./Command.js";
import type { Event } from "./Event.js";
import type { Operation } from "./Operation.js";
/**
 * Handles messaging between parts of an application.
 */
export interface MessageBus {
    /**
     * Retrieves a command.
     *
     * @param action The command specification. Either the name of a command, or
     *   a list of commands and/or operations to run in sequence.
     */
    command<T = void>(action: Action): Command<T>;
    /**
     * Retrieves an event.
     *
     * @param name Name of the event.
     */
    event<T = void>(name: string): Event<T>;
    /**
     * Retrieves an operation.
     *
     * @param name Name of the operation.
     */
    operation<T = void, TResult = undefined>(action: Action): Operation<T, TResult>;
    /**
     * Determines whether a command with the given name exists.
     *
     * @param name Name of the command.
     */
    hasCommand(name: string): boolean;
    /**
     * Determines whether an event with the given name exists.
     *
     * @param name Name of the event.
     */
    hasEvent(name: string): boolean;
    /**
     * Determines whether an operation with the given name exists.
     *
     * @param name Name of the operation.
     */
    hasOperation(name: string): boolean;
    /**
     * Returns all registered commands.
     */
    allCommands(): IterableIterator<Command>;
    /**
     * Returns all registered operations.
     */
    allOperations(): IterableIterator<Operation>;
}