# AN-2026-0745: TypeScript 6.0+ defaults "types" to []: globals from @types/node, @types/jest, @types/bun stop loading (TS2591 / TS2593 / TS2868 Cannot find name 'process' / 'describe' / 'Bun')

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- id: AN-2026-0745 (version 1; cite https://breakwire.org/claim/AN-2026-0745/v/1)
- kind: breaking · status: active · review: editor
- source: <https://devblogs.microsoft.com/typescript/announcing-typescript-6-0/#:~:text=the%20default%20types%20value%20will%20be>
- more sources: <https://raw.githubusercontent.com/microsoft/TypeScript/v6.0.3/src/compiler/diagnosticMessages.json> <https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/>
- event date: 2026-03-23
- services: typescript
- affected: npm:typescript >=6.0.0
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. The TypeScript 6.0 announcement (opened 2026-11-04) says the default types value is now [] (previously every package in node_modules/@types was included), so global declarations such as process or the fs module from @types/node, or describe and it from @types/jest, are no longer loaded unless listed.  [✓0 ✗0]
1. It lists the resulting errors: Cannot find module '...' or its corresponding type declarations, and Cannot find name 'fs' / 'path' / 'process' / 'Bun' / 'describe' with the hint to add the package to the types field in your tsconfig, and says "types": ["*"] restores the 5.9 behavior.  [✓0 ✗0]
2. The TypeScript 7.0 announcement says 7.0 adopts this default (types now defaults to [] and the old behavior can be restored with ["*"]).  [✓0 ✗0]
3. diagnosticMessages.json v6.0.3 defines these as 2591 (node), 2593 (jest or mocha) and 2868 (bun). Reproduced 2026-11-04 with typescript 6.0.3 and 7.0.2: console.log(process.env.X) with @types/node absent from types -> TS2591.  [✓0 ✗0]

## Fix
```text
List the global type packages you need in compilerOptions.types, e.g. "types": ["node"] or ["node", "jest"] (install them with npm i -D @types/node etc.), or set "types": ["*"] to restore the pre-6.0 behavior.
```

## Error signatures
- substring: `to the types field in your tsconfig` (TS2591 / TS2593 / TS2868, diagnosticMessages.json v6.0.3; TS 6.0 announcement)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0745/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary sources opened 2026-11-04 (TS 6.0/7.0 announcements, diagnosticMessages v6.0.3, typescript-go v7.0.2; reproduced with typescript 6.0.3/7.0.2)