# AN-2026-0743: TypeScript 7.0 (npm latest since 2026-07-08): options deprecated in 6.0 are hard errors TS5102 / TS5108 and "ignoreDeprecations": "6.0" no longer silences them

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- id: AN-2026-0743 (version 1; cite https://breakwire.org/claim/AN-2026-0743/v/1)
- kind: breaking · status: active · review: editor
- source: <https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/#:~:text=provides%20hard%20errors%20in%20the%20face%20of%20any%20flags>
- more sources: <https://raw.githubusercontent.com/microsoft/typescript-go/typescript/v7.0.2/internal/diagnostics/diagnostics_generated.go> <https://devblogs.microsoft.com/typescript/announcing-typescript-6-0/>
- event date: 2026-07-08
- services: typescript
- affected: npm:typescript >=7.0.0
- severity: high
- 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 7.0 announcement (July 8, 2026; opened 2026-11-04) says TypeScript 7 is installed with npm install -D typescript, adopts 6.0's new defaults, and provides hard errors in the face of any flags and constructs deprecated in TypeScript 6.0.  [✓0 ✗0]
1. The same post lists the deprecations that turned into hard errors with no-op behavior: target es5, downlevelIteration, moduleResolution node/node10 and classic, module amd/umd/systemjs/none, baseUrl, esModuleInterop or allowSyntheticDefaultImports set to false, alwaysStrict false, the module keyword for namespaces, the asserts keyword on imports, and no-default-lib directives.  [✓0 ✗0]
2. The TypeScript 6.0 announcement says these deprecations can be ignored in 6.0 with "ignoreDeprecations": "6.0", but TypeScript 7.0 will not support any of the deprecated options.  [✓0 ✗0]
3. The typescript-go diagnostic catalog at tag typescript/v7.0.2 defines 5102 (Option '{0}' has been removed. Please remove it from your configuration.) and 5108 (the same for Option '{0}={1}'). Reproduced 2026-11-04 with typescript@7.0.2: baseUrl -> TS5102 (with a hint to use paths), target es5 and moduleResolution node -> TS5108, still with ignoreDeprecations 6.0 set.  [✓0 ✗0]
4. npm registry: typescript dist-tags latest = 7.0.2, published 2026-07-08T15:55Z (opened 2026-11-04); an unpinned typescript devDependency (^ or latest) resolves to 7.x.  [✓0 ✗0]

## Fix
```text
Remove the option from tsconfig.json: drop baseUrl and prefix each paths entry (e.g. "@app/*": ["./src/app/*"], or "*": ["./*"] if baseUrl was a lookup root); target es5 -> es2015 or newer (use an external compiler for ES5 output); moduleResolution node/node10/classic -> nodenext (Node) or bundler (bundlers/Bun); module amd/umd/systemjs/none -> esnext or preserve; delete downlevelIteration and false esModuleInterop/allowSyntheticDefaultImports/alwaysStrict. Or pin "typescript": "~6.0.3" with "ignoreDeprecations": "6.0" until migrated.
```

## Error signatures
- substring: `has been removed. Please remove it from your configuration` (TS5102 / TS5108, typescript-go v7.0.2 diagnostics)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0743/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)