export type UrlRewriteExpression = {
    pattern: RegExp;
    replacement: string;
};
export type CheckOptions = {
    concurrency?: number;
    port?: number;
    path: string | string[];
    recurse?: boolean;
    timeout?: number;
    markdown?: boolean;
    linksToSkip?: string[] | ((link: string) => Promise<boolean>);
    serverRoot?: string;
    directoryListing?: boolean;
    retry?: boolean;
    retryNoHeader?: boolean;
    retryNoHeaderCount?: number;
    retryNoHeaderDelay?: number;
    retryErrors?: boolean;
    retryErrorsCount?: number;
    retryErrorsJitter?: number;
    urlRewriteExpressions?: UrlRewriteExpression[];
    userAgent?: string;
    extraHeaders?: {
        [key: string]: string;
    };
};
export type InternalCheckOptions = {
    syntheticServerRoot?: string;
    staticHttpServerHost?: string;
} & CheckOptions;
export declare const DEFAULT_USER_AGENT = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36";
/**
 * Validate the provided flags all work with each other.
 * @param options CheckOptions passed in from the CLI (or API)
 */
export declare function processOptions(options_: CheckOptions): Promise<InternalCheckOptions>;