[http-client-js] Preserve parsed body in storage compat responses

[Jeremy Meng (jeremymeng)]

Copilot agent (on behalf of Jeremy Meng (@jeremymeng)):

Summary

• Copy the parsed response body before flattening storage compatibility response headers.
• Preserve header precedence on the top-level operation result without mutating _response.parsedBody.
• Add regression coverage for body/header name collisions and circular response metadata.

Testing

• pnpm --filter @azure-tools/typespec-ts exec vitest run --project test-next test-next/unit/static-helpers/storage-compat-response.test.ts
• pnpm -r --filter "@azure-tools/typespec-ts..." build
• pnpm change verify

Fixes #5323

[github-actions]

All changed packages have been documented.

• ✅ @azure-tools/typespec-ts

Show changes

@azure-tools/typespec-ts - fix ✏️

Preserve the original parsed response body when flattening response headers for storage compatibility.

[github-actions]

📦 Package size report

✅ No notable package size changes compared to the base branch.

13 package(s) with no notable change

Package	Packed (base → head)	Δ Packed	Unpacked (base → head)	Δ Unpacked
@azure-tools/typespec-ts	527.17 KB → 527.19 KB	+21 B (+0.0%)	2.54 MB → 2.54 MB	+49 B (+0.0%)
@azure-tools/typespec-java	13.51 MB → 13.51 MB	-13 B (-0.0%)	15.03 MB → 15.03 MB	—
@azure-tools/azure-http-specs	146.71 KB → 146.71 KB	—	1.16 MB → 1.16 MB	—
@azure-tools/typespec-autorest	80.93 KB → 80.93 KB	—	395.06 KB → 395.06 KB	—
@azure-tools/typespec-autorest-canonical	7.42 KB → 7.42 KB	—	26.00 KB → 26.00 KB	—
@azure-tools/typespec-azure-core	129.43 KB → 129.43 KB	—	702.77 KB → 702.77 KB	—
@azure-tools/typespec-azure-portal-core	42.41 KB → 42.41 KB	—	192.91 KB → 192.91 KB	—
@azure-tools/typespec-azure-resource-manager	171.92 KB → 171.92 KB	—	1.04 MB → 1.04 MB	—
@azure-tools/typespec-azure-rulesets	5.16 KB → 5.16 KB	—	32.09 KB → 32.09 KB	—
@azure-tools/typespec-client-generator-core	229.25 KB → 229.25 KB	—	1.23 MB → 1.23 MB	—
@azure-tools/typespec-go	259.87 KB → 259.87 KB	—	1.33 MB → 1.33 MB	—
@azure-tools/typespec-metadata	15.91 KB → 15.91 KB	—	62.26 KB → 62.26 KB	—
@azure-tools/typespec-python	42.22 KB → 42.22 KB	—	164.91 KB → 164.91 KB	—

_{Packed = gzipped .tgz published to npm. Unpacked = total extracted size. 🆕 added, 🗑️ removed. Packages from the core/ submodule are not included.
🔴 grew · 🟢 shrank — only changes of at least 512 B and 0.5% are marked.}

[pkg-pr-new]

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npm i https://pkg.pr.new/@azure-tools/typespec-ts@5325

commit: 15e7081

[azure-sdk-automation]

You can try these changes here

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