• process
    • global obj that provides information about, and control over, the current Node.js process.
    • As a global, it is always available to Node.js applications without using require().
  • process.env
    • property returns an object containing the user environment.
    • It is possible to modify this object, but such modifications will not be reflected outside the Node.js process
    • is the object for the environment variables set in the OS, such as
      • >windows中的环境变量
        CommonProgramFiles=C:\Program Files\Common Files
        CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
        CommonProgramW6432=C:\Program Files\Common Files
    • set the new env variable
      • process.env.mode = 'TESTING';
  • why env?
    • One of the best ways to use sensitive information in open source repositories without hard-coding the information within publicly available repositories is setting environment variables.
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