TypeScript test runner

Experimental runner for TypeScript compiler and conformance tests:

• Docs: TypeScript-Compiler-Notes/systems/testing/baselines.md
• Tests: TypeScript/tests/baselines/reference

It was used to explore feasibility of: oxc-project/oxc#2912

Note

This project already implemented the key features but it is far from usable. See Status.

How to run this?

cargo run --bin test-runner /path/to/TypeScript/repo

_{Tested with: TypeScript#56a08250f3516b3f5bc120d6c7ab4450a9a69352}

Status

• Parse all compiler (tests/cases/compiler) and conformance (tests/cases/conformance) tests
  • These are all the tests that are used to test TypeScript type checker
  • A test consists of tsconfig settings and a set of source files.
• Parse error baselines
  • These are used to make sure invalid code constructs and types throw errors as expected
• Parse type baselines
  • These contain type annotations for every node in the AST and are used to verify types inferred by the type checker
• Parse individual files within each test with OXC
• Resolve imports using oxc_resolver with a virtual file system (only containing files defined in the test)
• Implement OXC Visitor to walk the tree in the same order as TSC
  • Needs to mimic the logic of TypeWriterWalker: src/harness/typeWriter.ts#L179
• Assert types and errors match the baselines