import { EventEmitter } from "eventemitter3";
import { CoreContext, ModulesRecord, ModulesRecordDefault } from "./CoreContext";
/**
 * Base class, acting as a pluggable module, for extending {@link CoreContext} functionality.\
 * It enables clean separation of concerns while maintaining full access to context capabilities.\
 * Modules are assigned to context {@link CoreContext}, can provide services to features {@link Object3DFeature}, and manage their own
 * lifecycle through the {@link useCtx useCtx(ctx)} pattern.
 * @see {@link https://three-kvy-core.vladkrutenyuk.ru/docs/api/core-context-module | Official Documentation}
 * @see {@link https://github.com/vladkrutenyuk/three-kvy-core/blob/main/src/core/CoreContextModule.ts | Source}
 */
export declare abstract class CoreContextModule<TEventTypes extends EventEmitter.ValidEventTypes = string | symbol, TModules extends ModulesRecord = ModulesRecordDefault> extends EventEmitter<TEventTypes> {
    /** Read-only flag to mark that it is an instance of {@link CoreContextModule}.*/
    readonly isCoreContextModule: true;
    /**
     * (readonly) Getter for the instance of {@link CoreContext} this is assigned to.
     * @warning **Throws exception** if try to access before assign.
     */
    get ctx(): CoreContext<TModules>;
    /** (readonly) Flag to check if this instance has been assigned to some {@link CoreContext}. */
    get hasCtx(): boolean;
    private _ctx?;
    constructor();
    /**
     * Overridable Lifecycle Method. Called when the module is assigned to a {@link CoreContext}. \
     * The returned cleanup function (optional) is called when the module is removed from the context.\
     * Also cleanup is called if context is destroyed.\
     * Calling the method manually is prohibited.
     * @param {CoreContext} ctx - An instance of {@link CoreContext} to which this module was assigned.
     * @returns {Function | undefined}
     */
    protected useCtx(ctx: CoreContext<TModules>): ReturnOfUseCtx;
}
export type ReturnOfUseCtx = undefined | (() => void) | void;
export interface ICoreContextModuleProtected {
    _ctx?: CoreContext<ModulesRecordDefault>;
    useCtx<TModules extends ModulesRecord>(ctx: CoreContext<TModules>): ReturnOfUseCtx;
}