In `@supabase/functions/_backend/files/supabaseTusProxy.ts`:
- Around line 236-241: The HEAD handler's fetch call (in supabaseTusHeadHandler)
needs the same timeout and error handling as the create handler: wrap the
fetch(supabaseUrl, { method: 'HEAD', headers }) in a try/catch, use an
AbortController with a short timeout and clear the timer, catch and log errors
via cloudlog including requestId/error, and handle non-2xx responses by logging
and returning an appropriate response (e.g., propagate status or a 504/502)
instead of letting the request hang or fail silently.
- Around line 194-200: The PATCH handler's fetch call (where response is
assigned) needs the same timeout and error handling as the create handler: wrap
the fetch(...) that uses c.req.raw.body in a try/catch, use an AbortController
to enforce a timeout and clear its timer after fetch completes, catch and log
errors with cloudlog including requestId and the error, and return an
appropriate error response if the fetch fails or times out; update references to
response and any downstream logic to handle the case where fetch threw. Ensure
the unique symbols mentioned—response, cloudlog, c.req.raw.body—are used to
locate and modify the PATCH handler code.
- Around line 44-85: In rewriteLocationHeader validate the extracted uploadId
(from supabaseLocation.split('/').pop()) before using it: compute uploadId, and
if it's falsy or empty, call cloudlog with the requestId and supabaseLocation to
record the malformed URL and then throw an Error (or return the original
supabaseLocation) to avoid returning a bad Location header; ensure the cloudlog
message includes context and that the subsequent return only runs when uploadId
is a non-empty string.
- Around line 134-141: The fetch to supabaseUrl in the supabaseTusCreateHandler
lacks timeout and error handling—wrap the upstream request in a try/catch and
use an AbortController with a sensible timeout (e.g., 5–15s) to abort slow
requests; on error or timeout, log the error via cloudlog including requestId
and response.status (or error.message) and return a controlled error response to
the caller instead of letting the request hang or crash; update the fetch call
that uses headers and c.req.raw.body to use the controller.signal and ensure the
controller is cleared on success.

In `@tests/tus-upload.test.ts`:
- Around line 104-106: The ESLint rule requires describe block titles to start
with a lowercase letter; update every describe invocation in
tests/tus-upload.test.ts (e.g., the top-level describe currently titled "TUS
Upload Protocol Tests") to use a title that begins with a lowercase character
(for example change "TUS Upload Protocol Tests" to "tus upload protocol tests"),
and apply the same lowercasing convention to all nested describe(...) strings in
the file so they all comply with test/prefer-lowercase-title.
- Around line 117-124: The test currently treats the JSON result as unknown,
causing type errors when accessing config.TUSUpload and config.maxUploadLength;
fix it by asserting the response JSON to the expected shape (e.g. define or
inline a type/interface with TUSUpload: boolean and maxUploadLength: number) and
cast the result of response.json() to that type (for example use "const config =
await response.json() as { TUSUpload: boolean; maxUploadLength: number }") so
the test can access config.TUSUpload and config.maxUploadLength without
TypeScript errors.
- Around line 56-66: The fetch call using variable "data" passes a Uint8Array
into the request body which causes TS2769; update the PATCH request to wrap the
Uint8Array in a Blob (e.g., new Blob([data])) or pass data.buffer (ArrayBuffer)
so the Fetch API accepts it—modify the body in the fetch invocation where "data"
is used (the PATCH to uploadUrl with headers 'Tus-Resumable', 'Upload-Offset',
etc.) to use a Blob or ArrayBuffer instead.
- Around line 16-17: Remove the unused constant declarations SUPABASE_URL and
SUPABASE_SERVICE_KEY from tests/tus-upload.test.ts (they are declared but never
referenced), so delete the lines that define SUPABASE_URL and
SUPABASE_SERVICE_KEY (or replace them with underscored names if you intend to
keep them for future use) to resolve the TS6133 unused variable compilation
errors.

In `@tests/tus-upload.test.ts`:
- Around line 46-61: The TypeScript error occurs because new Blob([data]) uses a
Uint8Array directly; change uploadChunk to pass an ArrayBuffer to Blob instead
of the Uint8Array view: replace the Blob creation at new Blob([data]) with new
Blob([data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength)])
(or data.buffer if you know the buffer is tightly packed) so the BlobPart is an
ArrayBuffer and satisfies the type checker for the uploadChunk function.

In `@supabase/functions/_backend/files/files.ts`:
- Around line 553-574: The early HEAD TUS branch returns supabaseTusHeadHandler
before running setKeyFromIdParam and checkWriteAppAccess, letting anyone with
any upload key probe other apps; ensure app-level access is enforced by running
setKeyFromIdParam and checkWriteAppAccess prior to routing to
supabaseTusHeadHandler (either move the early HEAD check after those middleware
or invoke those checks inside the early branch) so that supabaseTusHeadHandler
is only called when the app key is validated.

In `@supabase/functions/_backend/files/supabaseTusProxy.ts`:
- Around line 209-265: Change the handler signatures to accept a typed context
and read auth/apikey from it: update supabaseTusCreateHandler (and likewise
supabaseTusPatchHandler and supabaseTusHeadHandler) to use
Context<MiddlewareKeyVariables> instead of Context, import
MiddlewareKeyVariables, and replace any implicit assumptions about
request-scoped auth with explicit c.get('apikey') and c.get('auth') lookups (use
these values when building headers via buildSupabaseAuthHeaders or anywhere auth
is forwarded); ensure any types for c.get returns are null-checked before use
and update forwardHeaders/transformMetadataForSupabase calls if they need the
apikey/auth values.

In `@supabase/functions/_backend/files/files.ts`:
- Around line 283-355: The decoded-TUS-ID logic in setKeyFromIdParam assumes
standard base64 (uses atob on normalizedFileId) but Supabase TUS IDs are
base64url (URL-safe chars and no padding); update the comment to say "base64url
encoded" and implement robust decoding that tries standard atob first and, on
failure or when input contains '-' or '_', converts base64url to standard base64
by replacing '-'->'+' and '_'->'/', adds '=' padding to length%4, then decodes;
keep all existing logging (cloudlog) and ensure extractedFileId is set and
c.set('fileId', extractedFileId) as before.

In `@tests/cli-sdk-utils.ts`:
- Around line 39-40: Replace the hardcoded SUPABASE_URL usage for localApiFiles
with the test routing helper: call getEndpointUrl('/functions/v1/files') and
assign its result to localApiFiles instead of
`${SUPABASE_URL}/functions/v1/files`; update any import or scope to ensure
getEndpointUrl is available where localApiFiles is defined so tests (including
CF Workers mode) use the routing helper.

In `@tests/cli-utils.ts`:
- Around line 144-145: The inline comment above the writeFile call is incorrect:
it says "Create a minimal package.json" but the code writes
'.package-lock.json'; update either the comment or the written filename to match
intent. Locate the writeFile invocation that writes join(nodeModulesPath,
'.package-lock.json') and change the comment to reference ".package-lock.json"
(or change the filename to 'package.json' if the sentinel should be
package.json) so the comment and the writeFile call are consistent.