/**
 * Helper to build headers
 */
export declare class HeadersBuilder {
    #private;
    constructor(headers?: Headers | Record<string, string> | null);
    acceptJson(): HeadersBuilder;
    acceptTextPlain(): HeadersBuilder;
    acceptTextHtml(): HeadersBuilder;
    acceptEventStream(): HeadersBuilder;
    contentTypeJson(): HeadersBuilder;
    contentTypeTextPlain(): HeadersBuilder;
    accept(mimeType: string): HeadersBuilder;
    contentType(mimeType: string): HeadersBuilder;
    authorization(value: string): HeadersBuilder;
    withHeader(header: string, value: string): HeadersBuilder;
    build(): Headers;
}
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