fix(flags): fix the way we optimistically send feature flags with capture methods when we have locally evaluated feature flags for a given instance
#563
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PR Summary
Enhanced feature flag local evaluation in PostHog Node.js client with improved property analysis and stricter controls.
- Added
getRequiredPropertiesmethod inposthog-node/src/extensions/feature-flags/feature-flags.tsto analyze properties needed for local evaluation - Implemented
strictLocalEvaluationoption inposthog-node/src/types.tsfor stronger control over local evaluation behavior - Enhanced
sendFeatureFlagsconfiguration inposthog-node/src/client.tsto improve optimistic flag sending with capture methods - Added comprehensive test coverage in
posthog-node/test/feature-flags.spec.tsfor property requirement analysis and strict local evaluation
4 files reviewed, 6 comments
Edit PR Review Bot Settings | Greptile
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| if (cohortId in this.cohorts) { | ||
| const cohort = this.cohorts[cohortId] | ||
| this.analyzeCohortProperties(cohort, personProperties, groupProperties, groupTypes) | ||
| } |
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style: could throw InconclusiveMatchError if cohort not found for consistency with other error handling
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| if (!cohort || !cohort.values) { | ||
| return | ||
| } |
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style: early return should include explanation in debug mode like other similar cases
Suggested change
| if (!cohort || !cohort.values) { | |
| return | |
| } | |
| if (!cohort || !cohort.values) { | |
| this.logMsgIfDebug(() => console.debug(`Skipping cohort analysis - cohort or cohort.values is null`)) | |
| return | |
| } |
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| describe('getRequiredProperties', () => { | ||
| it('should analyze person property requirements', async () => { | ||
| await posthog.reloadFeatureFlags() | ||
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| const requirements = posthog.getRequiredProperties('person-prop-flag') | ||
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| expect(requirements).toEqual({ | ||
| personProperties: ['plan'], | ||
| groupProperties: {}, | ||
| canEvaluateLocally: true, | ||
| requiresGroups: false, | ||
| groupTypes: [], | ||
| }) | ||
| }) |
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style: good test coverage for analyzing property requirements, but make sure to add test for handling undefined/null person properties
Suggested change
| describe('getRequiredProperties', () => { | |
| it('should analyze person property requirements', async () => { | |
| await posthog.reloadFeatureFlags() | |
| const requirements = posthog.getRequiredProperties('person-prop-flag') | |
| expect(requirements).toEqual({ | |
| personProperties: ['plan'], | |
| groupProperties: {}, | |
| canEvaluateLocally: true, | |
| requiresGroups: false, | |
| groupTypes: [], | |
| }) | |
| }) | |
| it('should analyze person property requirements', async () => { | |
| await posthog.reloadFeatureFlags() | |
| const requirements = posthog.getRequiredProperties('person-prop-flag') | |
| expect(requirements).toEqual({ | |
| personProperties: ['plan'], | |
| groupProperties: {}, | |
| canEvaluateLocally: true, | |
| requiresGroups: false, | |
| groupTypes: [], | |
| }) | |
| }) | |
| it('should handle undefined/null person properties', async () => { | |
| await posthog.reloadFeatureFlags() | |
| const requirements = posthog.getRequiredProperties('person-prop-flag') | |
| const flag = await posthog.getFeatureFlag('person-prop-flag', 'user123', { | |
| onlyEvaluateLocally: true, | |
| personProperties: { plan: undefined } | |
| }) | |
| expect(flag).toBe(false) | |
| }) |
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| // Just test that the capture method accepts the new structure without throwing | ||
| expect(() => { | ||
| posthog.capture({ | ||
| distinctId: 'user123', | ||
| event: 'test_event', | ||
| sendFeatureFlags: { | ||
| personProperties: { plan: 'premium' }, | ||
| onlyEvaluateLocally: true, | ||
| }, | ||
| }) | ||
| }).not.toThrow() | ||
| }) |
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style: expand basic capture test to verify the actual feature flag evaluation results
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Size Change: +9.04 kB (+2.91%) Total Size: 320 kB
ℹ️ View Unchanged
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closing; did it here: #565 |
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Problem
Closes PostHog/posthog#34188
Changes
TODO
Release info Sub-libraries affected
Bump level
Libraries affected
Changelog notes
capturemethods when we have locally evaluated feature flags for a given instance