import { type ISessionGlobalAccessObjectDefinition } from "./ISessionGlobalAccessObjectDefinition";
import { type IViewportGlobalAccessObjectDefinition } from "./IViewportGlobalAccessObjectDefinition";
import { StatePromise } from "./StatePromise";
export declare class StateEngine {
    private readonly _fontLoaded;
    private readonly _sessionEngines;
    private readonly _viewportEngines;
    private static _instance;
    private constructor();
    static get instance(): StateEngine;
    get fontLoaded(): StatePromise<boolean>;
    get sessionEngines(): {
        [key: string]: ISessionGlobalAccessObjectDefinition | undefined;
    };
    get viewportEngines(): {
        [key: string]: IViewportGlobalAccessObjectDefinition | undefined;
    };
}
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