export declare function getHeader(headers: HeadersInit | undefined, header: string): string | undefined;
/**
 * Given two ints from a Range header, and potential fileSize, returns:
 * 1. number of bytes the response should contain.
 * 2. the start index of the range. // inclusive
 * 3. the end index of the range. // inclusive
 */
export declare function calculateByteRangeIndexes(start: number | undefined, end: number | undefined, fileSize?: number): {
    byteSize?: number;
    start?: number;
    end?: number;
};
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