import * as t from 'io-ts';
export declare function getEnv(key: string, defaultValue?: string): string;
export declare function liftEnv<T = string>(key: string, lift: (s: string) => T, defaultValue?: T): T;
export declare function parseFromEnvOrFile<T, O>(schema: t.Type<T, O, string>, file: string, envVarName: string): Promise<T>;