chore: Replace prettier with oxfmt

[antonis]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Replace prettier with oxfmt (the Oxc formatter) across the entire repository. This recovers the import sorting capability lost in the ESLint → oxlint migration (#5867) and continues aligning with the Oxc toolchain.

What changed

• Added .oxfmtrc.json with the same formatting options as .prettierrc.json + built-in import sorting
• Replaced prettier with oxfmt in all package.json devDependencies and lint/fix scripts
• Removed .prettierrc.json and .prettierignore
• Auto-formatted all SDK files (198 files, mostly import reordering)

Formatting changes

The auto-format diff is almost entirely import reordering — grouping type imports before value imports, separating external from internal, and adding blank lines between groups. A few minor formatting normalizations (arrow function parens consistent with arrowParens: "avoid") are also included.

Performance

Metric	prettier	oxfmt	Speedup
Format check (285 files)	~3s	~70ms	~40x

Import sorting config

"sortImports": {
  "groups": [
    "type-import",
    ["value-builtin", "value-external"],
    ["type-internal", "value-internal"],
    ["type-parent", "type-sibling", "type-index"],
    ["value-parent", "value-sibling", "value-index"],
    "unknown"
  ]
}

Status

oxfmt is in beta (v0.42.0) but has 1.7M weekly npm downloads. It passes 100% of prettier's JS/TS conformance tests. sentry-javascript already migrated (#19200). Also adopted by Vue.js, Turborepo, and Hugging Face.

💡 Motivation and Context

• Recovers simple-import-sort functionality lost in oxlint migration (chore: Migrate from ESLint to oxlint #5867)
• sentry-javascript already migrated to oxfmt (#19200)
• ~40x faster formatting
• Completes the Oxc toolchain adoption (oxlint for linting, oxfmt for formatting)

Closes #5878

💚 How did you test it?

• yarn lint passes (all 4 lerna projects + native linters)
• yarn build passes
• All 1172 SDK tests pass (103 suites)
• All 186 tools tests pass (9 suites)
• oxfmt --check reports zero formatting issues

📝 Checklist

• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• I updated the docs if needed.
• I updated the wizard if needed.
• All tests passing
• No breaking changes

🔮 Next steps

• Monitor oxfmt for stable release (currently beta)
• Consider adding oxfmt VS Code extension once available

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

---

• chore: Replace prettier with oxfmt by antonis in #5880

• chore: Migrate from ESLint to oxlint by antonis in #5867
• chore(deps): bump activesupport from 7.0.8.6 to 7.2.3.1 in /samples/react-native-macos by dependabot in #5870
• chore(deps): bump activesupport from 6.1.7.10 to 7.2.3.1 in /samples/react-native by dependabot in #5869
• chore(deps): bump yauzl to ^3.2.1 by antonis in #5855
• chore(deps): bump appium from 2.4.1 to 3.2.2 by antonis in #5856
• fix(ios): Guard replay postInit behind runtime session replay check by antonis in #5858
• Add better needs_web check to CI by alwx in #5863
• chore(deps): bump fast-xml-parser to ^5.5.7 by antonis in #5854
• CI: detect-changes workflow to only check the affected components on the CI side by alwx in #5843
• chore(deps): bump getsentry/craft/.github/workflows/changelog-preview.yml from 2.24.1 to 2.25.0 by dependabot in #5861
• chore(deps): bump getsentry/craft from 2.24.1 to 2.25.0 by dependabot in #5862
• chore(deps): bump github/codeql-action from 4.32.6 to 4.34.1 by dependabot in #5860
• chore(deps): update JavaScript SDK to v10.45.0 by github-actions in #5848
• chore(deps): bump flatted from 3.4.1 to 3.4.2 by dependabot in #5853
• chore(deps): update Cocoa SDK to v9.8.0 by github-actions in #5847
• fix(tracing): Guard getNewScreenTimeToDisplay behind enableTimeToInitialDisplay by antonis in #5849
• chore(deps): bump json from 2.16.0 to 2.17.1.2 in /performance-tests by dependabot in #5844
• chore(docs): Add changelog entry for duplicated breadcrumbs fix by antonis in #5851
• fix(tracing): Unsubscribe spanEnd listeners after they fire to prevent accumulation by antonis in #5840
• fix(android): Properly remove duplicated breadcrumbs by vovkasm in #5841
• fix(tracing): Skip native frames and stall tracking for unsampled spans by antonis in #5842

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