feat(core): split exports by browser/server for bundle size by isaacs · Pull Request #20435 · getsentry/sentry-javascript

isaacs · 2026-04-21T23:37:00Z

Split the exports from @sentry/core into three options:

@sentry/core, the default (unchanged)
@sentry/core/browser, containing only shared and browser-specific
functionality, nothing server-specific.
@sentry/core/server, containing only shared and server-specific
functionality, nothing browser-specific.

This allows us to make the bundle sizes quite a bit smaller in our
browser SDKs where this is important, while adding more functionality to
our server-specific SDKs, in @sentry/core where they can be easily
shared across runtimes.

fix: #20434
fix: JS-2243

linear-code · 2026-04-21T23:37:04Z

JS-2243 Split @sentry/core exports up, adding ./server and ./browser exports

github-actions · 2026-04-22T03:15:03Z

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	26.16 kB	-	-
@sentry/browser - with treeshaking flags	24.63 kB	-	-
@sentry/browser (incl. Tracing)	44.13 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	46.34 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	49.08 kB	-	-
@sentry/browser (incl. Tracing, Replay)	83.48 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	72.96 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	88.15 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	100.8 kB	-	-
@sentry/browser (incl. Feedback)	43.4 kB	-	-
@sentry/browser (incl. sendFeedback)	30.96 kB	-	-
@sentry/browser (incl. FeedbackAsync)	36.14 kB	-	-
@sentry/browser (incl. Metrics)	27.44 kB	-	-
@sentry/browser (incl. Logs)	27.59 kB	-	-
@sentry/browser (incl. Metrics & Logs)	28.28 kB	-	-
@sentry/react	27.9 kB	-	-
@sentry/react (incl. Tracing)	46.36 kB	-	-
@sentry/vue	31.03 kB	-	-
@sentry/vue (incl. Tracing)	45.96 kB	-	-
@sentry/svelte	26.18 kB	-	-
CDN Bundle	28.85 kB	+0.03%	+7 B 🔺
CDN Bundle (incl. Tracing)	46.91 kB	-0.01%	-1 B 🔽
CDN Bundle (incl. Logs, Metrics)	30.27 kB	-0.02%	-6 B 🔽
CDN Bundle (incl. Tracing, Logs, Metrics)	48.03 kB	+0.01%	+4 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	69.35 kB	-0.01%	-3 B 🔽
CDN Bundle (incl. Tracing, Replay)	84.07 kB	+0.01%	+1 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	85.14 kB	-0.01%	-1 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback)	89.86 kB	+0.01%	+1 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	90.96 kB	-0.01%	-2 B 🔽
CDN Bundle - uncompressed	84.55 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	140.16 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	88.75 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	143.62 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	212.71 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	257.96 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	261.41 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	271.66 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	275.1 kB	-	-
@sentry/nextjs (client)	48.85 kB	-	-
@sentry/sveltekit (client)	44.58 kB	-	-
@sentry/node-core	59.06 kB	+0.02%	+10 B 🔺
@sentry/node	170.35 kB	+0.01%	+13 B 🔺
@sentry/node - without tracing	96.92 kB	+0.02%	+10 B 🔺
@sentry/aws-serverless	113.78 kB	+0.03%	+30 B 🔺
@sentry/cloudflare (withSentry) - minified	164.96 kB	-	-
@sentry/cloudflare (withSentry)	417.1 kB	-	-

View base workflow run

Split the exports from `@sentry/core` into three options: - `@sentry/core`, the default (unchanged) - `@sentry/core/browser`, containing _only_ shared and browser-specific functionality, nothing server-specific. - `@sentry/core/server`, containing _only_ shared and server-specific functionality, nothing browser-specific. This should allow us to make the bundle sizes quite a bit smaller in our browser SDKs where this is important, while adding more functionality to our server-specific SDKs, in `@sentry/core` where they can be easily shared across runtimes. Integration may require updating our `tsconfig` settings so that tsc knows it is allowed to look on `package.json` exports. fix: #20434 fix: JS-2243

Split the exports from `@sentry/core` into three options: - `@sentry/core`, the default (unchanged) - `@sentry/core/browser`, containing _only_ shared and browser-specific functionality, nothing server-specific. - `@sentry/core/server`, containing _only_ shared and server-specific functionality, nothing browser-specific. This should allow us to make the bundle sizes quite a bit smaller in our browser SDKs where this is important, while adding more functionality to our server-specific SDKs in `@sentry/core`, where they can more easily be shared across runtimes. Some integration requires updating `tsconfig` settings so that tsc knows it is allowed to look up `package.json` exports. fix: #20434 fix: JS-2243

Split the exports from `@sentry/core` into three options: - `@sentry/core`, the default (unchanged) - `@sentry/core/browser`, containing _only_ shared and browser-specific functionality, nothing server-specific. - `@sentry/core/server`, containing _only_ shared and server-specific functionality, nothing browser-specific. This should allow us to make the bundle sizes quite a bit smaller in our browser SDKs where this is important, while adding more functionality to our server-specific SDKs in `@sentry/core`, where they can more easily be shared across runtimes. Some integration requires updating `tsconfig` settings so that tsc knows it is allowed to look up `package.json` exports. In particular, we cannot use the `module: "node"` option, or `moduleResolution: "node"`. In many cases, this means either using `module: "esnext"` and `moduleResolution: "bundler"`, so that tsc lets the bundler handle the assembly, or `nodenext` or `node16` for both `module` and `moduleResolution`. fix: #20434 fix: JS-2243

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Split the exports from `@sentry/core` into three options: - `@sentry/core`, the default (unchanged) - `@sentry/core/browser`, containing _only_ shared and browser-specific functionality, nothing server-specific. - `@sentry/core/server`, containing _only_ shared and server-specific functionality, nothing browser-specific. This should allow us to make the bundle sizes quite a bit smaller in our browser SDKs where this is important, while adding more functionality to our server-specific SDKs in `@sentry/core`, where they can more easily be shared across runtimes. Some integration requires updating `tsconfig` settings so that tsc knows it is allowed to look up `package.json` exports. In particular, we cannot use the `module: "node"` option, or `moduleResolution: "node"`. In many cases, this means either using `module: "esnext"` and `moduleResolution: "bundler"`, so that tsc lets the bundler handle the assembly, or `nodenext` or `node16` for both `module` and `moduleResolution`. fix: #20434 fix: JS-2243

JPeer264

Do you think it would make sense to add size limit / bundle checks for these exports?

JPeer264 · 2026-04-30T11:03:18Z

@@ -1,4 +1,4 @@
-import { getActiveSpan, SentrySpan } from '@sentry/core';


q: Are these changes actually needed? I would assume @sentry/core could automagically detect which bundle it should take no?

It's needed in tests usually just so that vitest mocks the correct core export, and it was easier to just use a perl one-liner to update all the imports in all the tests in a given package if it's strictly browser or server.

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch 6 times, most recently from 143a2a5 to 1494709 Compare April 22, 2026 01:45

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch 5 times, most recently from d5dddbf to 8eba1e9 Compare April 22, 2026 18:26

isaacs marked this pull request as ready for review April 22, 2026 18:26

cursor Bot reviewed Apr 22, 2026

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isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 8eba1e9 to 8ea4f5c Compare April 22, 2026 18:50

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Comment thread dev-packages/rollup-utils/npmHelpers.mjs

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 8ea4f5c to 787f44b Compare April 22, 2026 19:19

isaacs enabled auto-merge (rebase) April 22, 2026 19:19

isaacs disabled auto-merge April 22, 2026 19:19

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 787f44b to 7076f7c Compare April 22, 2026 19:20

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Comment thread packages/core/src/shared-exports.ts

Comment thread packages/core/src/integrations/http/client-subscriptions.ts Outdated

isaacs requested review from mydea and timfish April 23, 2026 14:24

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 7076f7c to e2cf052 Compare April 23, 2026 14:34

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from e2cf052 to 67bf5c4 Compare April 23, 2026 14:41

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Comment thread packages/node-core/src/integrations/http/SentryHttpInstrumentation.ts Outdated

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Comment thread dev-packages/e2e-tests/test-applications/aws-serverless-layer/tests/layer.test.ts

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isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 67bf5c4 to 2cf15db Compare April 29, 2026 16:41

isaacs requested review from a team as code owners April 29, 2026 16:41

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 2cf15db to c1c9cf0 Compare April 29, 2026 16:46

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isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from c1c9cf0 to 5beb2e3 Compare April 29, 2026 17:22

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 5beb2e3 to ca38b53 Compare April 29, 2026 20:43

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isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from ca38b53 to 24304fe Compare April 29, 2026 20:52

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isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 24304fe to da8cd5a Compare April 29, 2026 21:07

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from da8cd5a to 8fe31cb Compare April 29, 2026 21:19

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 8fe31cb to 28b47ec Compare April 30, 2026 00:05

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Comment thread packages/core/src/server-exports.ts

isaacs force-pushed the isaacschlueter/split-server-browser-core-exports branch from 28b47ec to a783c2e Compare April 30, 2026 00:25

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		@@ -1,4 +1,4 @@
		import { getActiveSpan, SentrySpan } from '@sentry/core';

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isaacs commented Apr 21, 2026 •

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