A common convention in Node.js is that the NODE_ENV environment variable specifies the environment in which an application is running (usually, development or production).
For example, with express, setting NODE_ENV to “production” can improve performance by a factor of 3 according to the documentation. This enables:
Cache for view templates.
Cache for CSS files generated from CSS extensions.
Generate less verbose error messages.
references:
https://pm2.io/docs/runtime/best-practices/environment-variables/
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