Sample
typescript 5.9.3: Differentiate compilerOptions.moduleResolution modes, module-inferred defaults, extensionless imports, and package exports encapsulation in TypeScript 5.9.3
Verified sample for npm typescript 5.9.3: Differentiate compilerOptions.moduleResolution modes, module-inferred defaults, extensionless imports, and package…
sha256:754cc486559403bcea3329fe1832412e8eaa4798adc2a50df46d57de54a703b1
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
node linux x64 node node npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-17 |
| node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-18 |
Case
HOW- Goal
- Differentiate compilerOptions.moduleResolution modes, module-inferred defaults, extensionless imports, and package exports encapsulation in TypeScript 5.9.3
- Packages
- Symbols
-
- ts.CompilerOptions.moduleResolution
- Environment
- node
- Created
- 2026-08-17T09:28:39Z
Contract
- When compilerOptions.moduleResolution is omitted, compilerOptions.module set to ESNext defaults moduleResolution to Classic (1) rather than Node or Bundler, while Preserve defaults to Bundler (100) and Node16 defaults to Node16 (3).
- compilerOptions.moduleResolution set to Bundler accepts extensionless relative imports and directory index imports in ESM contexts
- compilerOptions.moduleResolution set to Node16 and NodeNext rejects extensionless relative imports with TS2835 and directory imports with TS2834
- relative .js specifiers resolve to underlying .ts source files across Node16, NodeNext, and Bundler moduleResolution modes
- direct .ts extension imports require allowImportingTsExtensions and otherwise fail with TS5097
- Node16 moduleResolution selects import or require package export conditions based on importer format, whereas Bundler defaults to import
- Node16, NodeNext, and Bundler moduleResolution enforce package exports encapsulation with TS2307, whereas legacy Node10 ignores exports maps
- Bundler moduleResolution respects customConditions compiler option to resolve matching conditional package exports
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/index.mjs
- test/contract.mjs