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Seven TS2769 across three files, one root cause: a bare `Uint8Array` widens to
`Uint8Array<ArrayBufferLike>`, which admits `SharedArrayBuffer` and so is not
assignable to `BodyInit`. Every one of the seven is a `fetch({ body })` call
rejecting an otherwise-valid payload.
They flow from exactly two producers:
buildMultipartBody() audioTranscription.ts -> 5 sites here + 1 in audioTranslation.ts
grpcWebFrame() windsurf.ts -> 1 site
Both allocate with `new Uint8Array(length)`, which is always ArrayBuffer-backed,
so declaring `Uint8Array<ArrayBuffer>` states what the code already guarantees.
This is a narrowing of the declaration to match reality, not a cast at the call
sites — no `as BodyInit` anywhere, and the seven call sites are untouched.
280 -> 273, zero new, on a line-number-agnostic diff of the full tsc error set.
The runtime diff is two return-type annotations; nothing executable changed.
Tests: buildMultipartBody already has four direct tests, but they assert the
payload's *contents* (boundary, filename sanitization, MIME fallback) — none
assert the backing, which is precisely what the new type guarantees and what a
plausible switch to a pooled `Buffer.concat` would break. Added
multipart-body-arraybuffer-backing.test.ts (3 tests): the buffer is a plain
ArrayBuffer, the view spans it entirely at offset 0 (no pool remainder), and
both hold for a 64 KiB payload past Node's Buffer-pool threshold. 258/258 across
the 17 affected audio/windsurf suites.
Not included: the 3 remaining TS2339 in audioTranscription.ts (`data?.data?.…`
on an untyped poll result). Different root cause — grouped by kind, not by file,
per #8484.