/** Supplies event timestamps; see {@link Graph.dateProvider}. */
export interface DateProvider {
    now(): Date;
}
/** When a dynamic link is recomputed relative to the behavior running; see {@link BehaviorBuilder.dynamicDemands}. */
export declare enum RelinkingOrder {
    relinkingOrderPrior = 0,
    relinkingOrderSubsequent = 1
}
export declare enum RelinkingTarget {
    demand = 0,
    supply = 1
}
export declare enum ResourceType {
    resource = 0,
    moment = 1,
    typedMoment = 2,
    state = 3
}
/** The kind of a {@link Demandable}: a plain demand, `resource.order`, or `state.trace`. */
export declare enum LinkType {
    reactive = 0,
    order = 1,
    trace = 2
}
/** One run of the event loop, opened by an action. */
export declare class GraphEvent {
    /** Increases by one per event; 0 before the first. */
    sequence: number;
    /** From {@link Graph.dateProvider} when the event started. */
    timestamp: Date;
    static readonly initialEvent: GraphEvent;
    constructor(sequence: number, timestamp: Date);
}
/** Internal: resources that reset at the end of an event. */
export interface Transient {
    clear(): void;
}