import { SymbolToken } from '@servicetitan/react-ioc';
import { JSON, Serializable } from './types';
export declare const EVENT_BUS_TOKEN: SymbolToken<EventBus<never>>;
export declare function typedEventBusToken<EventTypes extends Serializable<EventTypes>>(): SymbolToken<EventBus<EventTypes>>;
export type EventHandler<EventTypes, Event, T = never> = (data: [T] extends [never] ? Event extends SymbolToken<infer DataType> ? Serializable<DataType> : Event extends keyof EventTypes ? EventTypes[Event] : T : Serializable<T>) => void;
type JobPayload = JSON | void;
export type EventType = string | number | symbol;
export type SymbolTokenEventType<T, U extends EventType = EventType> = U extends SymbolToken<any> ? SymbolToken<T> : U;
export type JobEventHandler<Event> = (defer: {
    /**
     * Successfully complete a job.
     * @param result The value to return from the successfully completed job.
     */
    resolve(...result: Event extends SymbolToken<infer ResultType> ? undefined extends ResultType ? [Serializable<ResultType>?] : [Serializable<ResultType>] : [JobPayload]): void;
    /**
     * Fail a job.
     * @param reason The error to return from the failed job.
     */
    reject(reason?: string | Error): void;
}) => void;
export declare class EventBus<EventTypes extends Serializable<EventTypes> = never> {
    job: {
        /**
         * Register a job event handler. Jobs event handlers return a result or an error.
         * @param event The job event to handle.
         * @param handler The handler to call when the event occurs. This handler is passed a `resolve` callback to return a successful result, and a `reject` callback to return an error.
         */
        on: <Event extends SymbolToken<any> | keyof EventTypes>(event: Event, handler: JobEventHandler<Event>) => void;
        /**
         * Deregister a job event handler.
         * @param event The previously registered event.
         * @param handler The previously registered handler.
         */
        off: <Event extends SymbolToken<any> | keyof EventTypes>(event: Event, handler: JobEventHandler<Event>) => void;
        /**
         * Send a job event.
         * @param event The event to send.
         * @returns a Promise that resolves or rejects depending on whether the job completes successfully.
         */
        emit: <Event extends SymbolToken<any> | keyof EventTypes>(event: Event) => Promise<Event extends SymbolToken<infer ResultType> ? Serializable<ResultType> : JobPayload>;
    };
    private emitter;
    /**
     * Register an event handler.
     * @param event The event to handle.
     * @param handler The handler to call when the event occurs.
     */
    on: <T extends Serializable<T> = never, Event extends SymbolToken<T> | keyof EventTypes = any>(event: SymbolTokenEventType<T, Event>, handler: EventHandler<EventTypes, Event, T>) => void;
    /**
     * Deregister an event handler.
     * @param event The previously registered event.
     * @param handler The previously registered handler.
     */
    off: <T extends Serializable<T> = never, Event extends SymbolToken<T> | keyof EventTypes = any>(event: SymbolTokenEventType<T, Event>, handler: EventHandler<EventTypes, Event, T>) => void;
    /**
     * Send an event.
     * @param event The event to send.
     * @param data The data to pass to the event's handler.
     */
    emit: <T extends Serializable<T>, Event extends SymbolToken<T> | keyof EventTypes = any>(event: SymbolTokenEventType<T, Event>, ...data: Event extends SymbolToken<any> ? undefined extends T ? [T?] : [T] : [EventTypes] extends [never] ? [T?] : Event extends keyof EventTypes ? undefined extends EventTypes[Event] ? [EventTypes[Event]?] : [EventTypes[Event]] extends [never] ? [] : [EventTypes[Event]] : never) => void;
    private validateEvent;
    private getName;
}
export {};
//# sourceMappingURL=event-bus.d.ts.map