/**
 * Defines groups of typed events for the unstable event-log system.
 *
 * An `EventGroup` collects event definitions that belong together. Start with
 * `empty`, add events with their payload, success, and error schemas, then use
 * the group to build clients with `EventLog.schema` and server handlers with
 * `EventLog.group`. The group only describes events; it does not write or run
 * them.
 *
 * @stability unstable
 * @since 4.0.0
 */
import { type Pipeable } from "../Pipeable.ts";
import * as Record from "../Record.ts";
import type * as Schema from "../Schema.ts";
import * as Event from "./Event.ts";
/**
 * Unique type identifier used to mark event log event groups.
 *
 * @stability unstable
 * @category type IDs
 * @since 4.0.0
 */
export type TypeId = "~effect/eventlog/EventGroup";
/**
 * Runtime type identifier used to mark event log event groups.
 *
 * @stability unstable
 * @category type IDs
 * @since 4.0.0
 */
export declare const TypeId: TypeId;
/**
 * Returns `true` when a value is an event log event group.
 *
 * @stability unstable
 * @category guards
 * @since 4.0.0
 */
export declare const isEventGroup: (u: unknown) => u is Any;
/**
 * Typed collection of event definitions that represents a portion of an event log
 * domain.
 *
 * **When to use**
 *
 * Use when build groups from `empty.add(...)`, then provide implementations for the events
 * with `EventLog.group`.
 *
 * @stability unstable
 * @category models
 * @since 4.0.0
 */
export interface EventGroup<out Events extends Event.Any = Event.Any> extends Pipeable {
    readonly [TypeId]: TypeId;
    readonly events: Record.ReadonlyRecord<string, Events>;
    /**
     * Add an `Event` to the `EventGroup`.
     */
    add<Tag extends string, Payload extends Schema.Top = typeof Schema.Void, Success extends Schema.Top = typeof Schema.Void, Error extends Schema.Top = typeof Schema.Never>(options: {
        readonly tag: Tag;
        readonly primaryKey: (payload: Schema.Schema.Type<Payload>) => string;
        readonly payload?: Payload;
        readonly success?: Success;
        readonly error?: Error;
    }): EventGroup<Events | Event.Event<Tag, Payload, Success, Error>>;
    /**
     * Add an error schema to all the events in the `EventGroup`.
     */
    addError<Error extends Schema.Top>(error: Error): EventGroup<Event.AddError<Events, Error>>;
}
/**
 * Type-erased marker for an event log event group.
 *
 * @stability unstable
 * @category models
 * @since 4.0.0
 */
export interface Any {
    readonly [TypeId]: TypeId;
}
/**
 * Type-erased event group with its events record available structurally.
 *
 * @stability unstable
 * @category models
 * @since 4.0.0
 */
export type AnyWithProps = EventGroup<Event.Any>;
/**
 * Derives the handler service markers required for all events in an event group.
 *
 * @stability unstable
 * @category utility types
 * @since 4.0.0
 */
export type ToService<A> = A extends EventGroup<infer _Events> ? Event.ToService<_Events> : never;
/**
 * Extracts the union of event definitions contained in an event group.
 *
 * @stability unstable
 * @category utility types
 * @since 4.0.0
 */
export type Events<Group> = Group extends EventGroup<infer _Events> ? _Events : never;
/**
 * Client-side schema services required by all events in an event group.
 *
 * @stability unstable
 * @category utility types
 * @since 4.0.0
 */
export type ServicesClient<Group> = Event.ServicesClient<Events<Group>>;
/**
 * Server-side schema services required by all events in an event group.
 *
 * @stability unstable
 * @category utility types
 * @since 4.0.0
 */
export type ServicesServer<Group> = Event.ServicesServer<Events<Group>>;
/**
 * Creates an empty event group used as the starting point for defining a group.
 *
 * **When to use**
 *
 * Use when you need the starting `EventGroup` value before adding event
 * definitions with `.add(...)`.
 *
 * @stability unstable
 * @category constructors
 * @since 4.0.0
 */
export declare const empty: EventGroup<never>;
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