import { ExternalRefHandler } from '../types';
export type UserDefinedHeadersByUrlPrefix = {
    headers: {
        [key: string]: string;
    };
    url_prefix?: string;
}[];
type HeadersByUrlPrefix = Map<string | typeof ANY_PREFIX, {
    [key: string]: string;
}>;
declare const ANY_PREFIX: unique symbol;
export declare const DEFAULT_HEADERS: {
    accept: string;
};
export declare function getMostRelevantHeader(url: string, headersByUrlPrefix: HeadersByUrlPrefix): {
    [key: string]: string;
};
export declare function parseHeadersConfig(headersByUrlPrefix: UserDefinedHeadersByUrlPrefix): HeadersByUrlPrefix;
export declare const customHttpResolver: (headersByUrlPrefix: HeadersByUrlPrefix) => ExternalRefHandler;
export {};
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