import { Logger } from '@open-draft/logger';
import { Emitter, Listener } from 'strict-event-emitter';

type InterceptorEventMap = Record<string, any>;
type InterceptorSubscription = () => void;
/**
 * Request header name to detect when a single request
 * is being handled by nested interceptors (XHR -> ClientRequest).
 * Obscure by design to prevent collisions with user-defined headers.
 * Ideally, come up with the Interceptor-level mechanism for this.
 * @see https://github.com/mswjs/interceptors/issues/378
 */
declare const INTERNAL_REQUEST_ID_HEADER_NAME = "x-interceptors-internal-request-id";
declare function getGlobalSymbol<V>(symbol: Symbol): V | undefined;
declare function deleteGlobalSymbol(symbol: Symbol): void;
declare enum InterceptorReadyState {
    INACTIVE = "INACTIVE",
    APPLYING = "APPLYING",
    APPLIED = "APPLIED",
    DISPOSING = "DISPOSING",
    DISPOSED = "DISPOSED"
}
type ExtractEventNames<Events extends Record<string, any>> = Events extends Record<infer EventName, any> ? EventName : never;
declare class Interceptor<Events extends InterceptorEventMap> {
    private readonly symbol;
    protected emitter: Emitter<Events>;
    protected subscriptions: Array<InterceptorSubscription>;
    protected logger: Logger;
    readyState: InterceptorReadyState;
    constructor(symbol: symbol);
    /**
     * Determine if this interceptor can be applied
     * in the current environment.
     */
    protected checkEnvironment(): boolean;
    /**
     * Apply this interceptor to the current process.
     * Returns an already running interceptor instance if it's present.
     */
    apply(): void;
    /**
     * Setup the module augments and stubs necessary for this interceptor.
     * This method is not run if there's a running interceptor instance
     * to prevent instantiating an interceptor multiple times.
     */
    protected setup(): void;
    /**
     * Listen to the interceptor's public events.
     */
    on<EventName extends ExtractEventNames<Events>>(event: EventName, listener: Listener<Events[EventName]>): this;
    once<EventName extends ExtractEventNames<Events>>(event: EventName, listener: Listener<Events[EventName]>): this;
    off<EventName extends ExtractEventNames<Events>>(event: EventName, listener: Listener<Events[EventName]>): this;
    removeAllListeners<EventName extends ExtractEventNames<Events>>(event?: EventName): this;
    /**
     * Disposes of any side-effects this interceptor has introduced.
     */
    dispose(): void;
    private getInstance;
    private setInstance;
    private clearInstance;
}

export { ExtractEventNames as E, Interceptor as I, InterceptorEventMap as a, InterceptorSubscription as b, INTERNAL_REQUEST_ID_HEADER_NAME as c, deleteGlobalSymbol as d, InterceptorReadyState as e, getGlobalSymbol as g };