import { GraphBuilder } from "./GraphBuilder";
import { Graph, GraphFunctions, GraphNode, GraphNodeID, GraphNodeInput, GraphNodeOutput, StringKeyOf } from "./GraphTypes";
export declare enum GraphExecutionNodeState {
    NotStarted = "NotStarted",
    Started = "Started",
    Finished = "Finished",
    Error = "Error"
}
export declare class GraphExecutionNode<GFS extends GraphFunctions, Type extends StringKeyOf<GFS> = StringKeyOf<GFS>> {
    id: GraphNodeID;
    node: GraphNode<GFS, Type>;
    input?: GraphNodeInput<GFS[Type]>;
    output?: GraphNodeOutput<GFS[Type]>;
    error?: Error;
    state: GraphExecutionNodeState;
    dependents: Set<GraphExecutionNode<GFS, StringKeyOf<GFS>>>;
    constructor(id: GraphNodeID, node: GraphNode<GFS, Type>);
}
export declare function equals(a: any, b: any): boolean;
export declare class GraphExecutor<GFS extends GraphFunctions> {
    private readonly functions;
    readonly nodes: Map<string, GraphExecutionNode<GFS, StringKeyOf<GFS>>>;
    constructor(functions: GFS, graph?: Graph<GFS>);
    /**
     * @returns a new empty GraphBuilder with the same GraphFunctions type.
     */
    builder(): GraphBuilder<GFS, {}>;
    /**
     * Updates the execution graph while retaining all previous calculations.
     * This allows a second execution to take place much more quickly.
     */
    update(graph: Graph<GFS>): void;
    getNode(id: GraphNodeID): GraphExecutionNode<GFS, StringKeyOf<GFS>>;
    private areAllFinished;
    getNodesByState(state: GraphExecutionNodeState): GraphExecutionNode<GFS>[];
    getNodesByType<Type extends StringKeyOf<GFS>>(type: Type): GraphExecutionNode<GFS, Type>[];
    getOutputsByType<Type extends StringKeyOf<GFS>>(type: Type): GraphNodeOutput<GFS[Type]>[];
    private getInputsIfFinished;
    private calculateDependents;
    /**
     * Returns a promise that will resolve when the entire graph is executed or reject if any node throws.
     */
    execute(): Promise<boolean>;
    /**
     * start execution of all operations which are not awaiting other operations.
     */
    private executeFrame;
}