CommonJS 语法

CommonJS 是 npm 上大多数模块的交付格式。即使您使用上面的 ES 模块语法进行编写，对 CommonJS 语法的工作原理有一个简要的了解也会帮助您更轻松地进行调试。

CommonJS is the format which most modules on npm are delivered in. Even if you are writing using the ES Modules syntax above, having a brief understanding of how CommonJS syntax works will help you debug easier.