[all components] Reduce bundle size

[atomiks]

This trims bundle size mostly by keeping public APIs intact while letting internal component entrypoints import smaller implementation paths. The root package savings are modest after dropping the docs-breaking data-attribute enum conversion, but several popup-heavy component entrypoints still get measurable cuts.

Changes

• Split public Floating UI hooks from smaller core hooks used by internal popup components.
• Added a smaller internal store entrypoint for Base UI components while keeping @base-ui/utils/store as the full public barrel.
• Shared popup trigger/focus plumbing and reused lighter portal helpers where components do not need the full public portal surface.
• Trimmed popup, safe polygon, browser, visibility, and scroll-lock helper paths that are pulled into many popup-heavy entrypoints.

Bundle size

Measured with pnpm size:snapshot against upstream/master (221282c8c). Entry deltas are independent bundles, so the component rows do not sum into the root package delta.

Entry	Upstream gzip	PR gzip	Delta
@base-ui/react	148,822 B	148,592 B	-230 B
Tooltip	32,964 B	30,665 B	-2,299 B
Preview Card	31,899 B	29,701 B	-2,198 B
Dialog	20,621 B	19,794 B	-827 B
Popover	37,570 B	36,785 B	-785 B
Menu	48,559 B	46,358 B	-2,201 B
Select	42,316 B	40,827 B	-1,489 B
Combobox	45,666 B	45,166 B	-500 B
Drawer	31,891 B	31,157 B	-734 B
Toast	26,207 B	24,376 B	-1,831 B
@base-ui/utils/store	7,403 B	7,391 B	-12 B

Why it saves size

Change	Why it saves bundle size	Main affected entrypoints
Core useDismiss and useListNavigation hooks	Keeps public wrappers available, but lets internal components skip wrapper-only option code and imports.	Tooltip, Preview Card, Dialog, Popover, Menu, Select, Combobox
Internal @base-ui/utils/store/core path	Internal bundles use StoreCore/ReactStoreCore without public convenience methods like .use() and .observe(); the public @base-ui/utils/store barrel remains full-featured.	Root package, popup components, Select, Combobox
Lighter portal helpers	Shares portal node/context work and uses the smaller portal path where components do not need the full public FloatingPortal surface.	Dialog, Popover, Menu, Select, Combobox, Preview Card, Tooltip
Popup trigger/helper consolidation	Moves repeated trigger press, focus guard, and popup state plumbing into shared smaller helpers.	Tooltip, Preview Card, Popover, Menu, Select, Combobox
Safe polygon and visibility trimming	Simplifies hover intent and visibility helper code that is pulled through popup interactions.	Tooltip, Preview Card, Menu
Browser and scroll-lock utility trimming	Removes duplicated or heavier helper paths from code used by modal and dismissable components.	Dialog, Drawer, Popover, Menu, Select, Combobox

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@4813
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4813
  

commit: d7b8c66

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	▼-1.78KB(-0.38%)	▼-251B(-0.17%)

Details of bundle changes

Performance

Total duration: 1,350.84 ms +158.65 ms^(+13.3%) | Renders: 50 ⁽⁺⁰⁾ | Paint: 2,065.36 ms +230.71 ms^(+12.6%)

Test	Duration	Renders
Tabs mount (200 instances)	278.20 ms 🔺+49.92 ms(+21.9%)	4 (+0)
Scroll Area mount (300 instances)	104.29 ms 🔺+22.78 ms(+27.9%)	3 (+0)
Menu open (500 items)	87.98 ms 🔺+16.99 ms(+23.9%)	12 (+0)

details

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