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Feature flags
Feature flagging is a technique that can be used to turn features on/off. Thats it. Specifically for our use-case, feature flags are used to allow us to develop and commit WIP features to master so that we can easily have multiple people collaborate on the features at the same time, while not needing many branches-of-branches-of-branches. For our purposes, our feature flag panel is here. You can see most of the features are toggled to true. This means that those features are currently active. There are also IS_DEV features which are available only in development builds (yarn dev). These features will NOT show up in mycryptobuilds.com because mycryptobuilds is meant to publish a staged-production build.
Once you've made the feature flag, you can use the flag's boolean state in order to do a few things:
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Attach the feature's route status to the feature flag: https://github.com/MyCryptoHQ/MyCrypto/blob/master/common/v2/routing/routes.tsx#L243 which also will display/hide the route in the header dropdowns.
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Attach the feature's CTAs on the Dashboard to the status of the feature flag: https://github.com/MyCryptoHQ/MyCrypto/blob/master/common/v2/features/Dashboard/Dashboard.tsx#L51-L55
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Hide/display sections of components using component props. This means that effectively, you can "hide" a feature. Since you can "hide" a feature, you can publish code for new features without necessarily making it live in production.
All current feature flags are located in common/v2/config/isActiveFeature.ts.