export type ProviderCreator<O> = import('../shared/jimpleFns').ProviderCreator<O>;
export type EnvironmentUtilsProviderOptions = {
    /**
     * The name that will be used to register an instance of
     * {@link EnvironmentUtils }. Its default value is
     * `environmentUtils`.
     */
    serviceName: string;
};
/**
 * @module node/environmentUtils
 */
/**
 * @typedef {import('../shared/jimpleFns').ProviderCreator<O>} ProviderCreator
 * @template O
 */
/**
 * @typedef {Object} EnvironmentUtilsProviderOptions
 * @property {string} serviceName  The name that will be used to register an instance of
 *                                 {@link EnvironmentUtils}. Its default value is
 *                                 `environmentUtils`.
 * @parent module:node/environmentUtils
 */
/**
 * A simple service to avoid calling `process.env` on multiples places of an app.
 *
 * @parent module:node/environmentUtils
 * @tutorial environmentUtils
 */
export class EnvironmentUtils {
    /**
     * The current `NODE_ENV`. If the variable is empty, the value will be `development`.
     *
     * @type {string}
     * @access protected
     * @ignore
     */
    _env: string;
    /**
     * Whether or not the environment is production.
     *
     * @type {boolean}
     * @access protected
     * @ignore
     */
    _production: boolean;
    /**
     * Checks whether an environment variable exists or not.
     *
     * @param {string} name  The name of the variable.
     * @returns {boolean}
     */
    exists(name: string): boolean;
    /**
     * Gets the value of an environment variable.
     *
     * @param {string}  name               The name of the variable.
     * @param {string}  [defaultValue='']  A fallback value in case the variable is
     *                                     `undefined`.
     * @param {boolean} [required=false]   If the variable is required and `undefined`, it
     *                                     will throw an error.
     * @returns {string}
     * @throws {Error} If `required` is set to `true` and the variable is `undefined`.
     */
    get(name: string, defaultValue?: string, required?: boolean): string;
    /**
     * Sets the value of an environment variable.
     *
     * @param {string} name               The name of the variable.
     * @param {string} value              The value of the variable.
     * @param {string} [overwrite=false]  If the variable already exists, the method won't
     *                                    overwrite it, unless you set this parameter to
     *                                    `true`.
     * @returns {boolean} Whether or not the variable was set.
     */
    set(name: string, value: string, overwrite?: string): boolean;
    /**
     * Whether or not the environment is for development.
     *
     * @type {boolean}
     */
    get development(): boolean;
    /**
     * The current `NODE_ENV`. If the variable is empty, the value will be `development`.
     *
     * @type {string}
     * @access protected
     * @ignore
     */
    get env(): string;
    /**
     * Whether or not the environment is production.
     *
     * @type {boolean}
     * @access protected
     * @ignore
     */
    get production(): boolean;
}
/**
 * The service provider to register an instance of {@link EnvironmentUtils} on the
 * container.
 *
 * @type {ProviderCreator<EnvironmentUtilsProviderOptions>}
 * @tutorial environmentUtils
 */
export const environmentUtils: ProviderCreator<EnvironmentUtilsProviderOptions>;