code: function extendWithDotEnv(inputEnv, dotEnvPath = '.env') {
      let dotEnvBuffer = null
      try {
          dotEnvBuffer = fs.readFileSync(dotEnvPath)
      } catch (err) {
          if (err.code === 'ENOENT') return inputEnv
          throw err
      }
      const parsed = dotenv.parse(dotEnvBuffer)
      return extend(parsed, inputEnv)
  }
docs: Extend an env var object with the values parsed from a ".env" file, whose path is given by the second argument.