import { DotenvExpandOptions } from 'dotenv-expand';
import { ConfigFactory } from './config-factory.interface';
/**
 * @publicApi
 */
export interface ConfigModuleOptions {
    /**
     * If "true", values from the process.env object will be cached in the memory.
     * This improves the overall application performance.
     * See: https://github.com/nodejs/node/issues/3104
     */
    cache?: boolean;
    /**
     * If "true", registers `ConfigModule` as a global module.
     * See: https://docs.nestjs.com/modules#global-modules
     */
    isGlobal?: boolean;
    /**
     * If "true", environment files (`.env`) will be ignored.
     */
    ignoreEnvFile?: boolean;
    /**
     * If "true", predefined environment variables will not be validated.
     */
    ignoreEnvVars?: boolean;
    /**
     * Path to the environment file(s) to be loaded.
     */
    envFilePath?: string | string[];
    /**
     * Custom function to validate environment variables. It takes an object containing environment
     * variables as input and outputs validated environment variables.
     * If exception is thrown in the function it would prevent the application from bootstrapping.
     * Also, environment variables can be edited through this function, changes
     * will be reflected in the process.env object.
     */
    validate?: (config: Record<string, any>) => Record<string, any>;
    /**
     * Environment variables validation schema (Joi).
     */
    validationSchema?: any;
    /**
     * Schema validation options.
     * See: https://joi.dev/api/?v=17.3.0#anyvalidatevalue-options
     */
    validationOptions?: Record<string, any>;
    /**
     * Array of custom configuration files to be loaded.
     * See: https://docs.nestjs.com/techniques/configuration
     */
    load?: Array<ConfigFactory | Promise<ConfigFactory>>;
    /**
     * A boolean value indicating the use of expanded variables, or object
     * containing options to pass to dotenv-expand.
     * If .env contains expanded variables, they'll only be parsed if
     * this property is set to true.
     */
    expandVariables?: boolean | DotenvExpandOptions;
}