feature-flags
Use when feature flag tests fail, flags need updating, understanding @gate pragmas, debugging channel-specific test failures, or adding new flags to React.
DeepseekModel
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v1.0.0
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name feature-flags description Use when feature flag tests fail, flags need updating, understanding @gate pragmas, debugging channel-specific test failures, or adding new flags to React. React Feature Flags Flag Files File Purpose packages/shared/ReactFeatureFlags.js Default flags (canary), __EXPERIMENTAL__ overrides packages/shared/forks/ReactFeatureFlags.www.js www channel, __VARIANT__ overrides packages/shared/forks/ReactFeatureFlags.native-fb.js React Native, __VARIANT__ overrides packages/shared/forks/ReactFeatureFlags.test-renderer.js Test renderer Gating Tests @gate pragma (test-level) Use when the feature is completely unavailable without the flag: // @gate enableViewTransition it ( 'supports view transitions' , () => { // This test only runs when enableViewTransition is true // and is SKIPPED (not failed) when false }); gate() inline (assertion-level) Use when the feature exists but behavior differs based on flag: it ( 'renders component' , async () => { await act ( () => root. render ( < App /> )); if ( gate ( flags => flags. enableNewBehavior )) { expect (container. textContent ). toBe ( 'new output' ); } else { expect (container. textContent ). toBe ( 'legacy output' ); } }); Adding a New Flag Add to ReactFeatureFlags.js with default value Add to each fork file ( *.www.js , *.native-fb.js , etc.) If it should vary in www/RN, set to __VARIANT__ in the fork file Gate tests with @gate flagName or inline gate() Checking Flag States Use /flags to view states across channels. See the flags skill for full command options. __VARIANT__ Flags (GKs) Flags set to __VARIANT__ simulate gatekeepers - tested twice (true and false): /test www <pattern> # __VARIANT__ = true /test www variant false <pattern> # __VARIANT__ = false Debugging Channel-Specific Failures Run /flags --diff <channel1> <channel2> to compare values Check @gate conditions - test may be gated to specific channels Run /test <channel> <pattern> to isolate the failure Verify flag exists in all fork files if newly added Common Mistakes Forgetting both variants - Always test www AND www variant false for __VARIANT__ flags Using @gate for behavior differences - Use inline gate() if both paths should run Missing fork files - New flags must be added to ALL fork files, not just the main one Wrong gate syntax - It's gate(flags => flags.name) , not gate('name')
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| name | Skill name |
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| description | Description |
| category | Categories (array) |
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