import { DynamicModule } from '@nestjs/common';
import { ConfigFactory, ConfigModuleOptions } from './interfaces/index.js';
/**
 * @publicApi
 */
export declare class ConfigModule {
    /**
     * This promise resolves when parser completes loading environment variables.
     * When "ignoreEnvFile" is set to true, then it will resolve immediately after the
     * "ConfigModule#forRoot" method is called.
     * If "forRoot" is called more than once, it resolves once every call that is
     * in progress has loaded its environment variables.
     */
    static get envVariablesLoaded(): Promise<void>;
    private static environmentVariablesLoadedSignal;
    private static readonly _envVariablesLoaded;
    private static readonly pendingEnvLoads;
    private static readonly loadedEnv;
    /**
     * Loads environment variables based on the "ignoreEnvFile" flag and "envFilePath" value.
     * Additionally, registers custom configurations globally.
     * @param options
     */
    static forRoot(options?: ConfigModuleOptions): Promise<DynamicModule>;
    /**
     * Registers configuration object (partial registration).
     * @param config
     */
    static forFeature(config: ConfigFactory): DynamicModule;
    private static loadEnv;
    private static createDynamicModule;
    private static waitForPendingEnvLoads;
    private static expandVariables;
    /**
     * Object schemas strip the properties they don't declare (e.g. Zod), so the
     * undeclared variables are merged back in to keep them available through
     * process.env and ConfigService. Variables the schema declares are taken
     * from its output only, so a variable it removed (e.g. Joi's `strip()`)
     * stays removed.
     */
    private static mergeUndeclaredVariables;
    /**
     * Returns the variables the validator converted (or added), as opposed to
     * the ones it passed through as they were
     */
    private static getConvertedKeys;
    /**
     * Replaces the references a value makes to its own variable ("key") with
     * references to "alias", in the syntax of dotenv-expand
     */
    private static renameSelfReferences;
    private static assignVariablesToProcess;
    private static mergePartial;
}