It's common for NODE_ENV to mistakenly be used as a way to determine the application environment in which the code is running, such as development, test, staging, and production. This is often not the correct way to check this, since some frameworks use NODE_ENV to instead represent the build environment, such as development for local development, test for testing suite, and production for an optimized build.
Examples of incorrect code for this rule:
const isProduction = process.env.NODE_ENV === 'production';Examples of correct code for this rule:
// Note that we're using APP_ENV instead of NODE_ENV
const isProduction = process.env.APP_ENV === 'production';message- Custom error message to display when the rule is violated.
If you only have one application environment and are able to rely on NODE_ENV=production to represent the production environment, then this rule is not for you.