import { ContentRange, type Token } from "./deps.js";
export declare const enum RangeUnit {
    Bytes = "bytes",
    None = "none"
}
/** Shallow merge two headers. */
export declare function shallowMergeHeaders(left: Headers, right: Headers): Headers;
export declare class RequestedRangeNotSatisfiableResponse extends Response {
    constructor(contentRange: ContentRange, init?: Omit<ResponseInit, "status"> | undefined);
}
/** Whether the inputs are equal to case sensitivity. */
export declare function equalsCaseInsensitive(left: string, right: string): boolean;
/** Whether the input has {@link Token} or not.
 * If the input is invalid [`Accept-Ranges`](https://www.rfc-editor.org/rfc/rfc9110.html#section-14.3-2) then `false`.
 */
export declare function hasToken(input: string, token: Token): boolean;