import type { Task } from "./types.js";
export interface StateMachineDef<TState extends string = string, TEvent extends string = string> {
    readonly initial: TState;
    readonly states: readonly TState[];
    readonly events: Readonly<Record<TEvent, EventDef<TState>>>;
}
export interface EventDef<TState extends string = string> {
    readonly from: readonly TState[] | "*";
    readonly to: TState;
    readonly guard?: (task: Task) => true | string;
    readonly onEnter?: (task: Task) => void | Promise<void>;
    readonly onExit?: (task: Task) => void | Promise<void>;
}
export declare function validateMachine(machine: StateMachineDef): void;
export declare function eventsFromState<TState extends string, TEvent extends string>(machine: StateMachineDef<TState, TEvent>, fromState: TState): readonly TEvent[];
export declare function findEvent<TState extends string, TEvent extends string>(machine: StateMachineDef<TState, TEvent>, fromState: TState, eventName: TEvent): EventDef<TState> | undefined;