Feature toggles in NodeJS

I had to implement a feature toggle recently.

What is a feature toggle?

I will keep it short. You have to add a new feature to your product, but you want that feature to be available only for certain type of users. What you do? Well, you just make an if check to see the user can see this feature and then you toggle it for him. Here is a sample check:

if(ToggleRouter.isEnabled("comments")) {
  // Display the feature to the user
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