/// <reference types="node" />
import { ExtendedRequest, ExtendedResponse, KeywordMapper, SiteMeta, LastModifiedByLocale } from "./common";
export interface SeoOptions {
    useCache?: boolean;
    defaultCache?: string[];
    cacheDir?: string;
    test?: boolean;
    altHost?: string;
    cacheDays?: number;
}
export interface SeoSubDirOptions {
    subDir: boolean;
    subDirBase: string;
    subDirOptional: boolean;
}
export declare class SeoMiddleware {
    private siteId;
    private options;
    private subDirOptions;
    constructor(siteId: string, options: SeoOptions, subDirOptions: SeoSubDirOptions);
    writeToCache(url: string, locale: string, translated: string): Promise<void>;
    getHtml(url: string, locale: string, html?: string): Promise<string>;
    getFromCache(url: string, locale: string, skip: boolean, callback: (e?: Error, html?: Buffer | string, isValid?: boolean) => void): void;
    isEncoded(buffer: any): boolean;
    readHeaderAsString(res: ExtendedResponse, headerName: string): string;
    purgeCache(): Promise<void>;
    middleware(): (meta: SiteMeta, lastModified: LastModifiedByLocale, keywordsByLocale: KeywordMapper, reverseKeywordByLocale: KeywordMapper, req: ExtendedRequest, res: ExtendedResponse, next: () => void) => void;
}
export declare function setRenderServer(url: string): void;