require.main

• <module> | <undefined>

Module 对象代表 Node.js 进程启动时加载的入口脚本，如果程序的入口点不是 CommonJS 模块，则为 undefined。 请参阅“访问主模块”。

在 entry.js 脚本中：

console.log(require.main);

node entry.js

Module {
  id: '.',
  path: '/absolute/path/to',
  exports: {},
  filename: '/absolute/path/to/entry.js',
  loaded: false,
  children: [],
  paths:
   [ '/absolute/path/to/node_modules',
     '/absolute/path/node_modules',
     '/absolute/node_modules',
     '/node_modules' ] }

• <module> | <undefined>

The Module object representing the entry script loaded when the Node.js process launched, or undefined if the entry point of the program is not a CommonJS module. See "Accessing the main module".

In entry.js script:

console.log(require.main);

node entry.js

Module {
  id: '.',
  path: '/absolute/path/to',
  exports: {},
  filename: '/absolute/path/to/entry.js',
  loaded: false,
  children: [],
  paths:
   [ '/absolute/path/to/node_modules',
     '/absolute/path/node_modules',
     '/absolute/node_modules',
     '/node_modules' ] }