import EventEmitter from 'eventemitter3';
declare type UpdateState = (state: any) => void;
export declare type Initialized = Record<string, any>;
export interface BaseInput {
    data: any[];
    node: string;
    context?: any;
}
export interface WorkInput extends BaseInput {
    updateState: UpdateState;
    state?: any;
    signal: AbortSignal;
}
export declare type WorkOutput = Promise<any>;
export declare type RunFn = (arg: WorkInput) => WorkOutput;
export interface WorkNodeDef {
    run: RunFn;
    deps: string[];
    type?: 'work';
}
export interface BranchingInput extends BaseInput {
    branch: (node: string, reason?: string) => BranchingOutput;
    none: (reason?: string) => BranchingOutput;
}
export interface BranchingOutput {
    node: string | symbol;
    reason?: string;
}
export interface BranchingNodeDef {
    run: (arg: BranchingInput) => BranchingOutput;
    deps: string[];
    type: 'branching';
}
export declare type SuspensionInput = WorkInput;
export declare type SuspensionOutput = Promise<void>;
export interface SuspensionNodeDef {
    run?: (arg: SuspensionInput) => SuspensionOutput;
    deps: string[];
    type: 'suspension';
}
export declare type NodeType = 'work' | 'branching' | 'suspension';
export declare type Input = BranchingInput | SuspensionInput | WorkInput;
export declare type Output = BranchingOutput | SuspensionOutput | WorkOutput;
export declare type NodeDef = BranchingNodeDef | SuspensionNodeDef | WorkNodeDef;
export declare type DAG = Record<string, {
    deps: string[];
    type: NodeType;
}>;
export declare type Spec = Record<string, NodeDef>;
export interface Options {
    includeNodes?: string[];
    excludeNodes?: string[];
    data?: any;
    context?: any;
}
export declare type Response = {
    start(): Promise<void>;
    stop(): void;
    emitter: EventEmitter<Events, any>;
    getSnapshot(): Snapshot;
};
export declare type Status = 'pending' | 'running' | 'completed' | 'suspended' | 'errored';
export declare type NodeStatus = Status | 'skipped';
export interface NodeData {
    type: NodeType;
    deps: string[];
    status: NodeStatus;
    started?: Date;
    finished?: Date;
    input?: any[];
    output?: any;
    state?: any;
    error?: any;
    selected?: string;
    reason?: string;
}
export declare type SnapshotData = Record<string, NodeData>;
export interface Snapshot {
    status: Status;
    started: Date;
    finished?: Date;
    data: SnapshotData;
}
export declare type ObjectOfPromises = Record<string | number, Promise<any>>;
export declare type Events = 'data' | 'error' | 'done';
export declare type RunTopology = (spec: Spec, options?: Options) => Response;
export declare type RunTopologyInternal = (spec: Spec, dag: DAG, snapshot: Snapshot, context: any) => Response;
export declare type ResumeTopology = (spec: Spec, snapshot?: Snapshot, options?: Pick<Options, 'context'>) => Response;
export {};