import type { ClassConstructor } from 'class-transformer';
import type { ValidatorOptions } from 'class-validator';
export type ConfigLoader = (...args: any) => Record<string, any>;
export type AsyncConfigLoader = (...args: any) => Promise<Record<string, any>>;
export interface TypedConfigModuleOptions {
    /**
     * The root object for application configuration.
     */
    schema: ClassConstructor<any>;
    /**
     * Function(s) to load configurations, must be synchronous.
     */
    load: ConfigLoader | ConfigLoader[];
    /**
     * Defaults to "true".
     *
     * If "true", registers `ConfigModule` as a global module.
     * See: https://docs.nestjs.com/modules#global-modules
     */
    isGlobal?: boolean;
    /**
     * Custom function to normalize configurations. It takes an object containing environment
     * variables as input and outputs normalized configurations.
     *
     * This function is executed before validation, and can be used to do type casting,
     * variable expanding, etc.
     */
    normalize?: (config: Record<string, any>) => Record<string, any>;
    /**
     * Custom function to validate configurations. It takes an object containing environment
     * variables as input and outputs validated configurations.
     * If exception is thrown in the function it would prevent the application from bootstrapping.
     */
    validate?: (config: Record<string, any>) => Record<string, any>;
    /**
     * Options passed to validator during validation.
     * @see https://github.com/typestack/class-validator
     */
    validationOptions?: ValidatorOptions;
}
export interface TypedConfigModuleAsyncOptions extends TypedConfigModuleOptions {
    /**
     * Function(s) to load configurations, can be synchronous or asynchronous.
     */
    load: ConfigLoader | AsyncConfigLoader | (ConfigLoader | AsyncConfigLoader)[];
}