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feature_flags.md

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Feature Flags

Used to enable, disable and generally configure features outside an app release cycle.

Served by LaunchDarkly: Test Dashboard

Full list of current flag types and defaults here src/Services/FeatureFlags/flags.ts

Local Development with Flags

To enable a flag while developing either configure it in the LaunchDarkly dashboard or add the value to the overrides object in src/Services/FeatureFlags/overrides.ts

Creating a new Flag

  1. Add the flag to the codebase in flags.ts
  2. Use the value from useFeatureFlag to enable/disable/configure the feature
  3. Create the flag in the LaunchDarkly dashboard, choose the JSON variation and set up the variants to match the structure and types in flags.ts
  4. Configure the rollout in the Test environment
  5. Deploy the app and configure the rollout in Production

Note: Use the JSON format only as it's easier to add more values to feature flags later without breaking old clients

Simple feature toggle format:

Enabled Variation

{ "enabled": true }

Disabled Variation

{ "enabled": false }

Define extra parameters as needed:

{ 
  "enabled": false,
  "logAnalytics": false,
  "backgroundColor": "red",
  "numberOfRows": 4
}