import type { Options } from "./Options.ts";
import type { PostData, QueryString } from "./types/HttpArchiveFormat.ts";
export declare const calculateOnlyOnce: <T>(calculation: () => T) => () => T;
export declare const isNonEmptyString: (o: string | undefined) => o is string;
export declare function isHttp1x(version?: string): boolean | undefined;
export declare function roundToThreeDecimalPlaces(time: number | string, fractionalDigits?: number): number;
export declare function toNameValuePairs(object: Record<string, string | string[] | undefined>): QueryString[];
export declare function parseUrlEncoded(data: string): QueryString[];
export declare function parsePostData(contentType: string | undefined, postData: string | undefined, options: Options): PostData | undefined;