/// <reference path="../adonis-typings/config.d.ts" />
import { ConfigContract } from '@ioc:Adonis/Core/Config';
/**
 * Config module eases the process of using configuration inside your AdonisJs
 * applications.
 *
 * The config files are stored inside a seperate directory, which are loaded and cached
 * on application boot. Later you can access the values using the `dot` syntax.
 *
 * ## Access values
 *
 * 1. **Given the config file is stored as `config/app.js` with following content**
 *
 * ```js
 * module.exports = {
 *  appKey: ''
 * }
 * ```
 *
 * 2. **You access the appKey as follows**
 *
 * ```js
 * Config.get('app.appKey')
 * ```
 *
 * **NOTE:**
 * The `get` method doesn't raise runtime exceptions when top level objects are missing.
 */
export declare class Config implements ConfigContract {
    private config;
    constructor(config?: {});
    /**
     * Returns complete config
     */
    all(): {};
    /**
     * Read value from the pre-loaded config. Make use of the `dot notation`
     * syntax to read nested values.
     *
     * The `defaultValue` is returned when original value is `undefined`.
     *
     * @example
     * ```js
     * Config.get('database.mysql')
     * ```
     */
    get(key: string, defaultValue?: any): any;
    /**
     * Fetch and merge an object to the existing config. This method is useful
     * when you are fetching an object from the config and want to merge
     * it with some default values.
     *
     * An optional customizer can be passed to customize the merge operation.
     * The function is directly passed to [lodash.mergeWith](https://lodash.com/docs/4.17.10#mergeWith)
     * method.
     *
     * @example
     * ```js
     * // Config inside the file will be merged with the given object
     *
     * Config.merge('database.mysql', {
     *   host: '127.0.0.1',
     *   port: 3306
     * })
     * ```
     */
    merge(key: string, defaultValues: object, customizer?: (...args: any[]) => any): any;
    /**
     * Defaults allows providers to define the default config for a
     * module, which is merged with the user config
     */
    defaults(key: string, value: any): void;
    /**
     * Update in memory value of the pre-loaded config
     *
     * @example
     * ```js
     * Config.set('database.host', '127.0.0.1')
     * ```
     */
    set(key: string, value: any): void;
}