fix: include file extensions in client accept filters

[armancharan]

Summary

• generateMimeTypes and generateClientDropzoneAccept now emit known file extensions alongside MIME types (e.g. .jar for application/java-archive)
• Fixes #1157: Windows Chrome ignores MIME-only accept values and falls back to "All Files"
• Adds unit coverage for MIME+extension accept output and the dropzone accept attribute

Test plan

• bun run --filter @uploadthing/shared test
• bun run --filter @uploadthing/shared typecheck
• bun run --filter @uploadthing/shared lint
• On Windows Chrome: configure a route with 'application/java-archive' and confirm the file picker filters to .jar files

Made with Cursor

Summary by CodeRabbit

• Bug Fixes

  • Improved file upload type filtering so accepted file types now include known extensions alongside MIME types.
  • Enhanced support for specific formats like PDF and Java archives, plus broader wildcard MIME categories.

• Tests

  • Added coverage for extension-aware accept mappings and empty-state behavior when broad file types are allowed.

[changeset-bot]

🦋 Changeset detected

Latest commit: b38d1f3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
@uploadthing/shared	Patch
@uploadthing/react	Patch
@uploadthing/vue	Patch
@uploadthing/solid	Patch
uploadthing	Patch
@uploadthing/expo	Patch
@uploadthing/svelte	Patch
@uploadthing/nuxt	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: de72ecce-bb9e-4aec-b70b-d739fe6e04f8

📥 Commits

Reviewing files that changed from the base of the PR and between 720849f and b38d1f3.

📒 Files selected for processing (3)

• .changeset/accept-mime-extensions.md
• packages/shared/src/component-utils.ts
• packages/shared/test/component-utils.test.ts

Included review availability: Your plan includes up to 8 reviews per rolling hour; 7 remain after this review.

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Walkthrough

The shared upload utilities now resolve known file extensions from MIME types. Client accept mappings include those extensions for file-picker filters. Tests cover Java archives, PDFs, accept attributes, and blob handling. A changeset marks patch releases for affected packages.

Changes

MIME extension filters

Layer / File(s)	Summary
MIME extension resolution packages/shared/src/component-utils.ts	The utilities aggregate MIME tables, resolve dotted extensions, and append known extensions for PDF and explicit MIME types.
Client accept mapping and validation packages/shared/src/component-utils.ts, packages/shared/test/component-utils.test.ts, .changeset/accept-mime-extensions.md	generateClientDropzoneAccept builds extension-aware mappings for explicit MIME types and wildcard categories. Tests cover Java archive and PDF filters, accept-attribute conversion, and blob. The changeset records patch releases for five packages.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to b38d1

The PR adds known file extensions to client accept filters to improve Windows Chrome file selection while preserving existing MIME-based behavior; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the primary change: adding file extensions to client accept filters.
Linked Issues check	✅ Passed	The changes add .jar filtering for application/java-archive and preserve related MIME filtering, with tests covering the required behavior in issue #1157.
Out of Scope Changes check	✅ Passed	The changeset, shared utility updates, and tests are directly related to the linked issue and stated objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[greptile-apps]

Confidence Score: 4/5

The extension-filtering fix should be completed for supported MIME families outside the five imported tables before merging.

Raw supported MIME values such as font or model types bypass extension resolution because the lookup excludes the vendored miscellaneous MIME table, preserving the Windows file-picker failure for those routes.

Files Needing Attention: packages/shared/src/component-utils.ts

Important Files Changed

Filename	Overview
packages/shared/src/component-utils.ts	Adds MIME-extension lookup and rewrites dropzone accept generation, but omits supported MIME families held in the misc table.
packages/shared/test/component-utils.test.ts	Covers specific application MIME, PDF, and blob behavior, but does not exercise MIME families outside the imported tables.
.changeset/accept-mime-extensions.md	Accurately describes the intended client accept-filter improvement and affected package releases.

Prompt To Fix All With AI

### Issue 1
packages/shared/src/component-utils.ts:30-36
**Extension lookup omits MIME families**

When a route uses a supported MIME type from the vendored `misc` table, such as `font/woff2` or `model/obj`, `extensionsForMime` returns no extension because `mimeTables` excludes that table, causing Windows Chrome to retain the MIME-only picker behavior this change is intended to fix.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "fix: include file extensions in client a..." | Re-trigger Greptile}

[greptile-apps]

Extension lookup omits MIME families

When a route uses a supported MIME type from the vendored misc table, such as font/woff2 or model/obj, extensionsForMime returns no extension because mimeTables excludes that table, causing Windows Chrome to retain the MIME-only picker behavior this change is intended to fix.

Prompt To Fix With AI

This is a comment left during a code review.
Path: packages/shared/src/component-utils.ts
Line: 30-36

Comment:
**Extension lookup omits MIME families**

When a route uses a supported MIME type from the vendored `misc` table, such as `font/woff2` or `model/obj`, `extensionsForMime` returns no extension because `mimeTables` excludes that table, causing Windows Chrome to retain the MIME-only picker behavior this change is intended to fix.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.