/**
 * All valid formats `fetchData` supports.
 */
export declare enum Formats {
    JSON = "json",
    TEXT = "text"
}
/**
 * The default timeout for `fetchData` when run on the server.
 * No timeout is used on the client.
 */
export declare const DEFAULT_SERVER_TIMEOUT = 1500;
/**
 * Fetch data from a given `url` with `headers` and then parse the response
 * assuming it is of type `format`. On the server wait a max of `timeout` and
 * throw if the response does not succeed. If it succeeds return the parsed
 * data.
 *
 * @param url The URL to fetch data from.
 * @param headers Headers to send to the server with the request (default: none).
 * @param format The expected content type of the data (default: JSON).
 * @param timeout Maximum wait time for response (server only) (default: `DEFAULT_SERVER_TIMEOUT`).
 */
export declare function fetchData<ResponseT>(url: string, headers?: {
    [key: string]: string;
}, format?: Formats, timeout?: number): Promise<ResponseT>;
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