JavaScript Cloud Native Development Cookbook

Leveraging feature flags

The practice of decoupling deployment from release is predicated on the use of feature flags. We are continuously deploying small batches of change to mitigate the risks of each deployment. These changes are deployed all the way to production, so we need a feature flag mechanism to disable these capabilities until we are ready to release them and make them generally available. We also need the ability to enable these capabilities for a subset of users, such as beta users and internal testers. It is also preferable to leverage the natural feature flags of a system, such as permissions and preferences, to minimize the technical debt that results from littering code with custom feature flags. This recipe will show you ...