Function resolveR2AvailabilityForKeys

resolveR2AvailabilityForKeys(
keys: Iterable<string>,
options?: { concurrency?: number },
): Promise<Map<string, boolean>>
HEAD unique R2 keys (deduped) and return an availability map for upload-history retry UI.
Parameters
- keys: Iterable<string>
  R2 object keys to check (duplicates are ignored).
- Optionaloptions: { concurrency?: number }
  Optional tuning; defaults to R2_HEAD_CONCURRENCY.
Returns Promise<Map<string, boolean>>
Map from key to true (exists) or false (missing).
- Defined in lib/uploads/r2-availability.ts:62