import { SuperAgentRequest } from 'superagent';
import { HTTPMethod } from '../types/http';
export interface RequestOptions {
    /**
     * Request headers. An object with key-value pair.
     *
     * For a `undefined` value, the corresponding header will not be added to the request.
     * For a non-string value, it will be serialized before being added as a header.
     */
    headers?: Record<string, unknown>;
    /**
     * Query params. An object with key-value pair.
     *
     * The object will be serialized as query string and appended to the url.
     */
    query?: Record<string, unknown>;
}
export interface RequestConfig extends RequestOptions {
    method: HTTPMethod;
    body?: string | object;
}
export declare function request(url: string, requestConfig: RequestConfig): SuperAgentRequest;
/**
 * Normalize header object which has unknown type values.
 *
 * When a header value is not string type, the function converts it into string.
 * The function also filter out the entries with null or undefined value.
 */
export declare function normalizeHeaders(obj: Record<string, unknown>): Record<string, string>;