/// <reference path="../../adonis-typings/env.d.ts" />
import { DotenvParseOutput } from 'dotenv';
import { EnvContract, ValidateFn } from '@ioc:Adonis/Core/Env';
/**
 * The ENV module enables the use of environment variables by parsing dotfiles syntax
 * and updates the `process.env` object in Node.js.
 *
 * AdonisJs automatically reads and passes the contents of `.env` file to this class.
 */
export declare class Env implements EnvContract {
    private valuesToProcess;
    /**
     * A boolean to know if the values have been processed or
     * not
     */
    private hasProcessedValues;
    /**
     * A cache of env values
     */
    private envCache;
    /**
     * The schema to be used for validating and casting environment
     * variables
     */
    private validationSchema;
    constructor(valuesToProcess: {
        values: DotenvParseOutput;
        overwriteExisting: boolean;
    }[]);
    /**
     * Reference to the underlying schema
     */
    schema: import("@ioc:Adonis/Core/Env").EnvSchema;
    /**
     * Process parsed env variables. The values will be validated
     * against the validation schema
     */
    process(): void;
    /**
     * Register the validation schema
     */
    rules(schema: {
        [key: string]: ValidateFn<unknown>;
    }): any;
    /**
     * Returns the environment variable value. First the cached
     * values are preferred. When missing, the value from
     * "process.env" is used
     */
    get(key: string, defaultValue?: any): any;
    /**
     * Set key-value pair. The value will be validated using
     * the validation rule if exists.
     *
     * The original value is also updated on the `process.env`
     * object
     */
    set(key: string, value: any): void;
}