fix(types): add missing contentEncoding to S3Options type definition

[robobun]

Summary

• Adds the missing contentEncoding property to the S3Options TypeScript type definition in packages/bun-types/s3.d.ts
• The runtime support for contentEncoding was added in PR feat(s3): add Content-Encoding header support for S3 uploads #26149 but the type definitions were not updated, causing TypeScript errors and missing IDE autocompletion

Closes #27328

Test plan

• Verify contentEncoding appears in S3Options interface alongside contentDisposition
• Existing runtime tests in test/js/bun/s3/s3.test.ts already cover the runtime behavior

🤖 Generated with Claude Code

[robobun]

^{Updated 6:22 AM PT - Feb 21st, 2026}

❌ Your commit 858df1dc has 4 failures in Build #37877 (All Failures):

• vendor/elysia/test/response/stream.test.ts - 1 failing on 🐧 13 x64-asan
• test/cli/hot/watch-many-dirs.test.ts - 1 failing on 🐧 25.04 x64
• test/regression/issue/24364.test.ts - 1 failing on 🪟 11 aarch64
• test/regression/issue/11297/11297.test.ts - 1 failing on 🪟 2019 x64
• test/regression/issue/11297/11297.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/regression/issue/11297/11297.test.ts - 1 failing on 🪟 11 aarch64

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🧪   To try this PR locally:

bunx bun-pr 27329

That installs a local version of the PR into your bun-27329 executable, so you can run:

bun-27329 --bun

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Walkthrough

A new optional property contentEncoding?: string was added to the S3Options interface in the Bun S3 type definitions, including JSDoc documentation describing its purpose and usage. No runtime logic changes were introduced.

Changes

Cohort / File(s)	Summary
S3 Type Definitions packages/bun-types/s3.d.ts	Added contentEncoding?: string optional property to the S3Options interface with comprehensive JSDoc documentation explaining the Content-Encoding header and providing usage examples.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding the missing contentEncoding property to the S3Options type definition.
Description check	✅ Passed	The description provides good context about the fix and references the linked issue, but doesn't explicitly follow the template structure with the two required sections.
Linked Issues check	✅ Passed	The PR adds contentEncoding to S3Options type definition as required by issue #27328, addressing the TypeScript error and enabling IDE autocompletion.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to adding the contentEncoding property to the S3Options interface with documentation, directly addressing the linked issue.

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[claude]

✅ 858df — Looks good!

Reviewed 1 file in packages/bun-types/: Adds the missing contentEncoding property to the S3Options TypeScript type definition, aligning the types with the runtime support that was added in PR #26149.