env-allowed
Whether an environment variable's value is contained within an allow list. Allow list is provided by a comma-separated environment variable value.
$ npm install env-allowed --save
Example
Start node or your program with a value that is in the allow list.
NODE_ENV=developent node
Create a comma-separated allow list.
process.env.ENVIRONMENTS = 'development,test';
Validate that the current NODE_ENV is within the allow list.
allowed('ENVIRONMENTS');
// true