#22148 TypeScript: support testing Issue created by huonw Is your feature request related to a problem? Please describe. We have

typescript_test

and

tsx_test

(and so on) targets, but the

test

goal doesn't find them. Describe the solution you'd like Running

pants test ::

should run typescript tests, somehow. Notes: • these may interact with javascript tests • tools like

@babel/preset-typescript

(https://jestjs.io/blog/2019/01/25/jest-24-refreshing-polished-typescript-friendly#typescript-support) and https://www.npmjs.com/package/ts-jest allow

.ts

files to be fed into jest directly, i.e.

npx jest

will run

.ts

tests. Demo using `ts-jest`: cd $(mktemp -d) cat > package.json <<'EOF' { "name": "demo", "version": "0.0.1", "scripts": { "test": "npx jest" }, "dependencies": { "@types/jest": "29.5.14", "jest": "29.7.0", "ts-jest": "29.3.0" }, "jest": { "testMatch": ["<rootDir>/**/*.test.{js,ts}"], "transform": { "^.+\\.tsx?$": "ts-jest" } } } EOF cat > typescript.test.ts <<EOF test("typescript", () => {}); EOF # setup the lockfile npm install # OKAY: running tests outside of pants runs TS tests npm test # PASS ./typescript.test.ts # Now try Pants: cat > pants.toml <<EOF [GLOBAL] pants_version = "2.26.0a0" backend_packages.add = [ "pants.backend.experimental.javascript", "pants.backend.experimental.typescript", ] [nodejs] package_manager = "npm" EOF cat > BUILD <<EOF package_json(name="root", dependencies=[], scripts=[node_test_script()]) typescript_tests(name="ts_tests") EOF # Currently runs nothing: pants test :: Describe alternatives you've considered None yet. Additional context pantsbuild/pants