import { Data, TypeName } from './types';
import { getFilePathExtension } from './utils';
import { ClassTransformValidator } from './ClassTransformValidator';
export declare abstract class Loader<K extends string = string> extends ClassTransformValidator implements TypeName {
    static getFilePathExtension: typeof getFilePathExtension;
    constructor(args?: {
        fileLocationUri: string;
    });
    /**
     * Index name of the file contents used as an index key by the config
     * object.
     */
    readonly __name: K;
    /**
     * File location URI. The configuration file will be loaded at
     * this location, then validated.
     */
    __fileLocationUri: string;
    /**
     * Asynchronously loads and validates the contents of the config file.
     * An error will be thrown if the validator fails or rejects the data.
     */
    __load(): Promise<Data<Loader<K>, K>>;
    /**
     * Loads a Loader's file contents based on its .
     * @param parsedUri - Parsed URI from the Loader's config file location.
     */
    __loadFile(fileLocationUri: string): Promise<object | object[]>;
    /**
     * Loads and parses a config file in JSON format.
     * @param filePath - Path to the file to be loaded.
     */
    __loadFileJson(filePath: string): Promise<object | object[]>;
}