import type { SafeAny } from '@ngify/core';
import type { Observable } from 'rxjs';
import type { HttpBackend, HttpHandler } from './backend';
import type { HttpRequest } from './request';
import type { HttpEvent } from './response';
export interface HttpInterceptor {
    intercept(request: HttpRequest<SafeAny>, next: HttpHandler): Observable<HttpEvent<SafeAny>>;
}
export declare class HttpInterceptorHandler implements HttpHandler {
    private backend;
    private interceptorFns;
    private chain;
    constructor(backend: HttpBackend, interceptorFns?: HttpInterceptorFn[]);
    handle(request: HttpRequest<SafeAny>): Observable<HttpEvent<SafeAny>>;
}
export type HttpInterceptorFn = (req: HttpRequest<unknown>, next: HttpHandlerFn) => Observable<HttpEvent<unknown>>;
export type HttpHandlerFn = (req: HttpRequest<unknown>) => Observable<HttpEvent<unknown>>;
/**
 * Creates an `HttpInterceptorFn` which lazily initializes an interceptor chain from the legacy
 * class-based interceptors and runs the request through it.
 */
export declare function legacyInterceptorFnFactory(interceptors: HttpInterceptor[]): HttpInterceptorFn;