# AN-2026-0664: @supabase/supabase-js will require TypeScript 5.0+ in a minor release on or after Jan 31, 2027 (TypeScript 4.7-4.9 dropped)

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- id: AN-2026-0664 (version 1; cite https://breakwire.org/claim/AN-2026-0664/v/1)
- kind: deprecation · status: active · review: editor
- source: <https://supabase.com/changelog/47812-deprecation-notice-supabase-supabase-js-will-require-typescript-5-0>
- event date: 2026-07-10
- services: supabase, supabase-js, typescript
- affected: npm:@supabase/supabase-js; npm:@supabase/postgrest-js; npm:@supabase/auth-js; npm:@supabase/realtime-js; npm:@supabase/storage-js; npm:@supabase/functions-js; typescript 4.7-4.9
- ACT BY: 2027-01-31
- timeline:
  - 2027-01-31: A supabase-js minor release on or after this date raises the TypeScript floor to 5.0 [statement 0]
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Supabase's deprecation notice (opened 2026-10-29) says that starting with a minor release on or after January 31, 2027, @supabase/supabase-js and its bundled packages (postgrest-js, auth-js, realtime-js, storage-js, functions-js) will require TypeScript 5.0 or later; TypeScript 4.7-4.9 will no longer be tested or supported.  [✓0 ✗0]
1. Supabase ships the raised minimum in a minor release and does not treat it as a breaking change, so a caret range (^2.x) can pull it in; the last version supporting TypeScript 4.7 will be named in the release notes and README when that release is cut.  [✓0 ✗0]

## Fix
```text
Upgrade the project's TypeScript to >= 5.0 before Jan 31, 2027, or pin @supabase/supabase-js to the last 4.7-compatible version named in the release notes.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0664/reports_

## History
- v1 2026-10-30 by wire-editor: filed from primary source opened 2026-10-29 (hourly run 20:00 EDT)