feat: support loading masking remotely

[joshsny]

Changes

Add support for setting up session replay masking in remote config / decide

Checklist

• Tests for new code (see advice on the tests we use) - added unit tests
• Accounted for the impact of any changes across different browsers - should be independent of browser variation
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!) - no breaking changes as this is an optional new config

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Feb 21, 2025 4:07pm

[github-actions]

Size Change: +7.58 kB (+0.23%)

Total Size: 3.32 MB

Filename	Size	Change
dist/array.full.es5.js	270 kB	+780 B (+0.29%)
dist/array.full.js	373 kB	+757 B (+0.2%)
dist/array.full.no-external.js	372 kB	+757 B (+0.2%)
dist/array.js	185 kB	+755 B (+0.41%)
dist/array.no-external.js	183 kB	+755 B (+0.41%)
dist/main.js	185 kB	+755 B (+0.41%)
dist/module.full.js	373 kB	+757 B (+0.2%)
dist/module.full.no-external.js	372 kB	+757 B (+0.2%)
dist/module.js	185 kB	+755 B (+0.41%)
dist/module.no-external.js	183 kB	+755 B (+0.41%)

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	216 kB
dist/customizations.full.js	14 kB
dist/dead-clicks-autocapture.js	14.5 kB
dist/exception-autocapture.js	9.51 kB
dist/external-scripts-loader.js	2.64 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	70 kB
dist/surveys.js	73.1 kB
dist/tracing-headers.js	1.76 kB
dist/web-vitals.js	10.4 kB

_{compressed-size-action}

[greptile-apps]

PR Summary

This PR adds remote configuration support for session recording masking options in PostHog's JavaScript SDK, allowing masking settings to be controlled from the server side.

• Added new constant SESSION_RECORDING_MASKING in src/constants.ts for storing server-side masking configuration
• Extended RemoteConfig interface in src/types.ts to include optional masking property for server configuration
• Implemented masking getter in SessionRecording class that combines client and server configurations, with client settings taking precedence
• Added comprehensive tests verifying masking behavior across different server/client configuration scenarios

_{4 file(s) reviewed, 1 comment(s)
Edit PR Review Bot Settings | Greptile}

[joshsny]

@pauldambra not sure why safari is failing here, seems unrelated...

[pauldambra]

this looks correct to me... You could add a playwright test to prove that remote config applies