import { IncomingHttpHeaders } from 'http';
export declare function isStatusCodeOK(code: number): boolean;
export declare function getGlobalValue(...keys: string[]): string | undefined;
export declare function safeSetEnv(k: string, v: string, f?: boolean): void;
export declare function defaultVal<T>(v: T | undefined, d: T): T;
export declare function getRemoteFileInfo(url: string): Promise<{
    body: string;
    headers: IncomingHttpHeaders;
    etag?: string | undefined;
}>;