export interface ILoadFileProgressEvent {
    total: number;
    loaded: number;
}
export type LoadFileResponseType<T> = T extends "text" ? string : T extends "arraybuffer" ? ArrayBuffer : Blob;
/**
 * Loads the file located at the given url and returns a promise with its content. The promise is rejected if an error occurs while loading the file.
 * @param url defines the url to load from
 * @param responseType defines the type of response expected ("text", "arraybuffer", or "blob")
 * @param progressCallback defines a callback to call when progress changes
 * @returns a promise with the loaded file content
 */
export declare function loadFile<T extends "text" | "arraybuffer" | "blob">(url: string, responseType: T, progressCallback?: (data: ILoadFileProgressEvent) => void): Promise<LoadFileResponseType<T>>;
/**
 * Loads a JSON file from the given url and returns a promise with its content. The promise is rejected if an error occurs while loading the file or if the loaded content cannot be parsed as JSON.
 * @param url defines the url to load from
 * @param progressCallback defines a callback to call when progress changes
 * @returns a promise with the loaded JSON content
 */
export declare function loadJsonFile<T>(url: string, progressCallback?: (data: ILoadFileProgressEvent) => void): Promise<T>;