feat(flags): send device_id on feature flag requests

[andehen]

Problem

Changes

Release info Sub-libraries affected

Libraries affected

• All of them
• posthog-js (web)
• posthog-js-lite (web lite)
• posthog-node
• posthog-react-native
• @posthog/react
• @posthog/ai
• @posthog/nextjs-config
• @posthog/nuxt

Checklist

• Tests for new code
• Accounted for the impact of any changes across different platforms
• Accounted for backwards compatibility of any changes (no breaking changes!)
• Took care not to unnecessarily increase the bundle size

If releasing new changes

• Ran pnpm changeset to generate a changeset file
• Added the "release" label to the PR to indicate we're publishing new versions for the affected packages

[vercel]

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

Project	Deployment	Preview	Updated (UTC)
posthog-js	Ready	Preview	Nov 14, 2025 2:13pm

[github-actions]

📝 No Changeset Found

This PR doesn't include a changeset. A changeset (and the release label) is required to release a new version.

How to add a changeset

Run this command and follow the prompts:

pnpm changeset

Remember: Never use major version bumps for posthog-js as it's autoloaded by clients.

[github-actions]

Download bundle size visualization

[github-actions]

Size Change: +740 B (+0.01%)

Total Size: 5.01 MB

Filename	Size	Change
packages/browser/dist/array.full.es5.js	298 kB	+74 B (+0.02%)
packages/browser/dist/array.full.js	365 kB	+74 B (+0.02%)
packages/browser/dist/array.full.no-external.js	379 kB	+74 B (+0.02%)
packages/browser/dist/array.js	161 kB	+74 B (+0.05%)
packages/browser/dist/array.no-external.js	173 kB	+74 B (+0.04%)
packages/browser/dist/main.js	162 kB	+74 B (+0.05%)
packages/browser/dist/module.full.js	365 kB	+74 B (+0.02%)
packages/browser/dist/module.full.no-external.js	379 kB	+74 B (+0.02%)
packages/browser/dist/module.js	162 kB	+74 B (+0.05%)
packages/browser/dist/module.no-external.js	174 kB	+74 B (+0.04%)

ℹ️ View Unchanged

Filename	Size	Change
packages/ai/dist/anthropic/index.cjs	17.3 kB	0 B
packages/ai/dist/anthropic/index.mjs	17.2 kB	0 B
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packages/browser/dist/all-external-dependencies.js	226 kB	0 B
packages/browser/dist/crisp-chat-integration.js	1.97 kB	0 B
packages/browser/dist/customizations.full.js	19 kB	0 B
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packages/browser/dist/posthog-recorder.js	244 kB	0 B
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packages/browser/dist/recorder.js	113 kB	0 B
packages/browser/dist/surveys-preview.js	71.1 kB	0 B
packages/browser/dist/surveys.js	83 kB	0 B
packages/browser/dist/tracing-headers.js	1.84 kB	0 B
packages/browser/dist/web-vitals.js	10.4 kB	0 B
packages/browser/react/dist/esm/index.js	18.8 kB	0 B
packages/browser/react/dist/umd/index.js	21.9 kB	0 B
packages/core/dist/error-tracking/chunk-ids.js	2.54 kB	0 B
packages/core/dist/error-tracking/chunk-ids.mjs	1.31 kB	0 B
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packages/core/dist/error-tracking/parsers/index.mjs	1.92 kB	0 B
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packages/core/dist/error-tracking/parsers/opera.js	2.22 kB	0 B
packages/core/dist/error-tracking/parsers/opera.mjs	706 B	0 B
packages/core/dist/error-tracking/parsers/react-native.js	203 B	0 B
packages/core/dist/error-tracking/parsers/react-native.mjs	0 B	0 B	🆕
packages/core/dist/error-tracking/parsers/safari.js	1.88 kB	0 B
packages/core/dist/error-tracking/parsers/safari.mjs	574 B	0 B
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packages/core/dist/error-tracking/parsers/winjs.mjs	406 B	0 B
packages/core/dist/error-tracking/types.js	1.33 kB	0 B
packages/core/dist/error-tracking/types.mjs	131 B	0 B
packages/core/dist/error-tracking/utils.js	1.8 kB	0 B
packages/core/dist/error-tracking/utils.mjs	604 B	0 B
packages/core/dist/eventemitter.js	1.78 kB	0 B
packages/core/dist/eventemitter.mjs	571 B	0 B
packages/core/dist/featureFlagUtils.js	6.5 kB	0 B
packages/core/dist/featureFlagUtils.mjs	4.28 kB	0 B
packages/core/dist/gzip.js	1.88 kB	0 B
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packages/core/dist/index.js	5.7 kB	0 B
packages/core/dist/index.mjs	485 B	0 B
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packages/core/dist/testing/PostHogCoreTestClient.mjs	1.74 kB	0 B
packages/core/dist/testing/test-utils.js	2.77 kB	0 B
packages/core/dist/testing/test-utils.mjs	1.09 kB	0 B
packages/core/dist/types.js	8.2 kB	0 B
packages/core/dist/types.mjs	5.93 kB	0 B
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packages/node/dist/types.mjs	0 B	0 B	🆕
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tooling/rollup-utils/dist/index.js	1.17 kB	0 B

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[posthog-bot]

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