/**
 * An object that reads files.
 */
export interface UrlLoader {
    /**
     * Returns `true` if this loader can load the given `url`.
     */
    canLoad(url: string): boolean;
    /**
     * Reads a file from `url`.
     *
     * This should only be called if `canLoad` returns `true` for `url`.
     */
    load(url: string): Promise<string>;
    /**
     * Lists files in a directory in the current project.
     *
     * @param path A relative path to a directory to read.
     * @param deep If true, lists files recursively. Returned paths are
     *     relative to `url`.
     */
    readDirectory?(path: string, deep?: boolean): Promise<string[]>;
}