import { Buffer } from 'buffer';
import { Stream } from "stream";
import { Config } from "./Config";
import { KyofuucObject } from "../helper";
export declare const RequestType: {
    TEXT: string;
    JSON: string;
    STREAM: string;
    BUFFER: string;
    RAW_TEXT: string;
    RAW_JSON: string;
    FORM_DATA: string;
    ARRAY_BUFFER: string;
    URL_SEARCH_PARAMS: string;
};
export type RequestTransformer = (data: any) => {
    buffer: Buffer | string;
    contentType: string;
};
export interface Request {
    key?: string;
    url?: string;
    __cached__?: boolean;
    __cached_expires_at__?: Date;
}
export declare function textRequestTransformer(data: string): {
    contentType: string;
    buffer: Buffer<ArrayBuffer>;
};
export declare function rawTextRequestTransformer(data: string): {
    buffer: string;
    contentType: string;
};
export declare function jsonRequestTransformer(data: object): {
    contentType: string;
    buffer: Buffer<ArrayBuffer>;
};
export declare function rawJsonRequestTransformer(data: object): {
    contentType: string;
    buffer: string;
};
export declare function bufferRequestTransformer(data: Buffer): {
    buffer: Buffer<ArrayBufferLike>;
    contentType: string;
};
export declare function arrayBufferRequestTransformer(data: ArrayBuffer): {
    buffer: Buffer<ArrayBufferLike>;
    contentType: string;
};
export declare function urlSearchParamsRequestTransformer(data: URLSearchParams): {
    buffer: Buffer<ArrayBuffer>;
    contentType: string;
};
export declare function formDataRequestTransformer(data: any): {
    buffer: any;
    contentType: string;
};
export declare function streamRequestTransformer(data: Stream): {
    buffer: Buffer<ArrayBufferLike>;
    contentType: string;
};
export declare const RequestProcessor: {
    _RegisteredTransformers: KyofuucObject<RequestTransformer>;
    register(type: string, transformer: RequestTransformer): void;
    unregister(type: string): void;
    transform(type: string, data: any): {
        buffer: Buffer | string;
        contentType: string;
    };
};
export declare function transformRequestData(config: Config, data: any, contentTypeNotSet: boolean, headers: KyofuucObject<any>, reject: (error: Error) => void): string | Buffer<ArrayBufferLike> | undefined;