export interface ContentPreference {
    readonly type: string;
    readonly subtype: string;
    readonly q: number;
    readonly specificity: 0 | 1 | 2;
}
/** Parse an `Accept` header, preserving quality and wildcard specificity. */
export declare function parseAcceptHeader(value: string | null): readonly ContentPreference[];
/**
 * Select the best offered media type for an `Accept` header. The returned string is the original
 * offered value, so parameters such as `profile` are preserved. An absent/empty header accepts the
 * first offer; an explicit `q=0` or no matching offer returns `undefined`.
 */
export declare function negotiateContentType(accept: string | null | Headers | Request, offered: readonly string[]): string | undefined;
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