feat: Add method to wait for feature flag definitions for local evaluation to be loaded.

[haacked]

This PR provides a way for users to determine if feature flag definitions for local evaluation are loaded.

Problem

Fixes #445

Changes

This adds a new waitForLocalEvaluationReady method that waits up to 30 seconds (configurable) for local evaluation feature flags to be loaded.

• It returns true immediately if flags are already loaded.
• It returns false immediately if local evaluation is not enabled.

This new method waits for the new localEvaluationFlagsLoaded event which is emitted when we retrieve feature flag definitions from the local evaluation endpoint.

This PR also adds a synchronous isLocalEvaluationReady() method that checks the feature flag poller to see if any flags are loaded.

Release info Sub-libraries affected

Bump level

• Major
• Minor
• Patch

Libraries affected

• All of them
• posthog-web
• posthog-node
• posthog-ai
• posthog-react-native

Changelog notes

• Added new waitForLocalEvaluationReady() method used to wait for local evaluation flags to be loaded.
• Added new localEvaluationFlagsLoaded event which is emitted every time local evaluation flags are loaded.
• Added new isLocalEvaluationReady() method to quickly check if feature flags are loaded.

[greptile-apps]

PR Summary

This PR adds asynchronous and synchronous methods for checking local evaluation readiness in the PostHog Node.js client.

• Updated /posthog-node/src/feature-flags.ts to emit a localEvaluationFlagsLoaded event and implement isLocalEvaluationReady.
• Added waitForLocalEvaluationReady with a configurable timeout in /posthog-node/src/posthog-node.ts.
• Enhanced /posthog-node/test/feature-flags.spec.ts with tests for flag loading behaviors and edge cases.

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[github-actions]

Size Change: +685 B (+0.41%)

Total Size: 168 kB

Filename	Size	Change
posthog-node/lib/index.cjs.js	35.2 kB	+345 B (+0.99%)
posthog-node/lib/index.esm.js	34.9 kB	+340 B (+0.98%)

ℹ️ View Unchanged

Filename	Size
posthog-react-native/lib/posthog-core/src/eventemitter.js	1.08 kB
posthog-react-native/lib/posthog-core/src/featureFlagUtils.js	1.51 kB
posthog-react-native/lib/posthog-core/src/index.js	12.6 kB
posthog-react-native/lib/posthog-core/src/lz-string.js	1.42 kB
posthog-react-native/lib/posthog-core/src/surveys-types.js	702 B
posthog-react-native/lib/posthog-core/src/types.js	492 B
posthog-react-native/lib/posthog-core/src/utils.js	956 B
posthog-react-native/lib/posthog-core/src/vendor/uuidv7.js	2.04 kB
posthog-react-native/lib/posthog-react-native/index.js	477 B
posthog-react-native/lib/posthog-react-native/src/autocapture.js	1.8 kB
posthog-react-native/lib/posthog-react-native/src/frameworks/wix-navigation.js	505 B
posthog-react-native/lib/posthog-react-native/src/hooks/useFeatureFlag.js	437 B
posthog-react-native/lib/posthog-react-native/src/hooks/useFeatureFlags.js	362 B
posthog-react-native/lib/posthog-react-native/src/hooks/useNavigationTracker.js	628 B
posthog-react-native/lib/posthog-react-native/src/hooks/usePostHog.js	249 B
posthog-react-native/lib/posthog-react-native/src/legacy.js	810 B
posthog-react-native/lib/posthog-react-native/src/native-deps.js	1.34 kB
posthog-react-native/lib/posthog-react-native/src/optional/OptionalAsyncStorage.js	183 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalExpoApplication.js	215 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalExpoDevice.js	211 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalExpoFileSystem.js	224 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalExpoLocalization.js	216 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalReactNativeDeviceInfo.js	220 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalReactNativeLocalize.js	169 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalReactNativeNavigation.js	218 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalReactNativeNavigationWix.js	222 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalReactNativeSafeArea.js	312 B
posthog-react-native/lib/posthog-react-native/src/optional/OptionalSessionReplay.js	231 B
posthog-react-native/lib/posthog-react-native/src/posthog-rn.js	4.85 kB
posthog-react-native/lib/posthog-react-native/src/PostHogContext.js	210 B
posthog-react-native/lib/posthog-react-native/src/PostHogProvider.js	1.74 kB
posthog-react-native/lib/posthog-react-native/src/storage.js	1.09 kB
posthog-react-native/lib/posthog-react-native/src/surveys/components/BottomSection.js	630 B
posthog-react-native/lib/posthog-react-native/src/surveys/components/Cancel.js	527 B
posthog-react-native/lib/posthog-react-native/src/surveys/components/ConfirmationMessage.js	742 B
posthog-react-native/lib/posthog-react-native/src/surveys/components/QuestionHeader.js	547 B
posthog-react-native/lib/posthog-react-native/src/surveys/components/QuestionTypes.js	2.81 kB
posthog-react-native/lib/posthog-react-native/src/surveys/components/SurveyModal.js	1.6 kB
posthog-react-native/lib/posthog-react-native/src/surveys/components/Surveys.js	1.82 kB
posthog-react-native/lib/posthog-react-native/src/surveys/getActiveMatchingSurveys.js	907 B
posthog-react-native/lib/posthog-react-native/src/surveys/icons.js	1.86 kB
posthog-react-native/lib/posthog-react-native/src/surveys/index.js	222 B
posthog-react-native/lib/posthog-react-native/src/surveys/PostHogSurveyProvider.js	1.82 kB
posthog-react-native/lib/posthog-react-native/src/surveys/surveys-utils.js	2.35 kB
posthog-react-native/lib/posthog-react-native/src/surveys/useActivatedSurveys.js	1.41 kB
posthog-react-native/lib/posthog-react-native/src/surveys/useSurveyStorage.js	690 B
posthog-react-native/lib/posthog-react-native/src/types.js	90 B
posthog-react-native/lib/posthog-react-native/src/version.js	123 B
posthog-web/lib/index.cjs.js	21.2 kB
posthog-web/lib/index.esm.js	21.2 kB

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