[number field] Reduce bundle size

[atomiks]

Reduces the @base-ui/react/number-field bundle size without changing behavior or the public API. The bundle bot is authoritative for the current size impact.

This simplifies numeral parsing, folds the stepper-button behavior into one hook, removes dead utilities and context members, and adds interaction regressions for the affected paths.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@5220
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@5220
  

commit: 49a966d

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	▼-2.39KB(-0.52%)	▼-686B(-0.46%)

Details of bundle changes

Performance

Total duration: 1,212.13 ms +31.24 ms^(+2.6%) | Renders: 78 ⁽⁺⁰⁾ | Paint: 1,895.29 ms +61.32 ms^(+3.3%)

Test	Duration	Renders
Tooltip mount (300 contained roots)	51.48 ms 🔺+8.63 ms(+20.1%)	1 (+0)

13 tests within noise — details

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Check out the code infra dashboard for more information about this PR.

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[Copilot]

Pull request overview

This PR reduces the @base-ui/react/number-field bundle size by simplifying and inlining internal Number Field utilities while preserving existing behavior, public API, and locale-aware parsing/formatting.

Changes:

• Reworked parseNumber to use range-based regex literals and codepoint arithmetic for numeral-system normalization (plus smaller replacement structures).
• Inlined useNumberFieldButton into useNumberFieldStepperButton and removed the unused visual viewport resize subscription helper.
• Simplified Number Field root context shape and updated call sites to read derived flags from state instead of duplicating fields.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/react/src/number-field/utils/validate.ts	Switches toValidatedNumber to a positional signature and simplifies step snapping.
packages/react/src/number-field/utils/validate.test.ts	Adds an adapter to keep existing object-fixture style tests while exercising the new signature.
packages/react/src/number-field/utils/subscribeToVisualViewportResize.ts	Removes the helper in favor of reading visualViewport.scale on demand.
packages/react/src/number-field/utils/parse.ts	Collapses numeral tables/maps and runtime RegExp construction into smaller regex literals + arithmetic-based digit mapping.
packages/react/src/number-field/scrub-area/NumberFieldScrubArea.tsx	Replaces subscription-based visual viewport scaling with a direct visualViewport?.scale read during cursor updates.
packages/react/src/number-field/root/useNumberFieldStepperButton.ts	Inlines the single-consumer stepper button logic (previously useNumberFieldButton).
packages/react/src/number-field/root/useNumberFieldButton.ts	Deletes the now-inlined hook implementation.
packages/react/src/number-field/root/NumberFieldRootContext.ts	Removes write-only / duplicated members from the root context interface.
packages/react/src/number-field/root/NumberFieldRoot.tsx	Updates validation call to the new toValidatedNumber signature and simplifies input-reason detection and key collection.
packages/react/src/number-field/input/NumberFieldInput.tsx	Switches to reading flags/values from state and replaces stopEvent with equivalent inline calls.
packages/react/src/internals/usePressAndHold.ts	Removes unused readOnly parameter and simplifies pointer-move tracking.

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