How to use ts-node with the v18 built-in testrunner?

[jtuchel]

Based on the built-in testrunner I want to run my tests inside a test directory. When dealing with .js files I'm using node --test ./test/**/*Tests.js. When dealing with .ts files I could use tsc && node --test ./build/**/*Tests.js.

But is it possible to use ts-node for that? :)

I'm not an expert, my pseudo command might look like node --test ts-node ./test/**/*Tests.ts

[cspotcode]

ts-node can be installed via --require ts-node/register or --loader ts-node/esm. Try those. Our docs also mention that you can use the NODE_OPTIONS env var to pass options to node.

[jtuchel]

ts-node can be installed via --require ts-node/register or --loader ts-node/esm. Try those. Our docs also mention that you can use the NODE_OPTIONS env var to pass options to node.

@cspotcode thanks for your reply! I tried it with the following setup

{
  "scripts": {
    "test": "node --test --require ts-node/register ./test/**/*Tests.ts"
  },
  "devDependencies": {
    "@types/node": "18.0.0",
    "ts-node": "10.8.1",
    "typescript": "4.7.4"
  }
}

This worked for me :)

[vegerot]

I got

❯ node --test --require ts-node/register ./test.spec.ts
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /Users/m0c0j7y/.../test.spec.ts
    at new NodeError (node:internal/errors:405:5)
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:99:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:142:36)
    at defaultLoad (node:internal/modules/esm/load:91:20)
    at DefaultModuleLoader.load (node:internal/modules/esm/loader:263:26)
    at DefaultModuleLoader.moduleProvider (node:internal/modules/esm/loader:179:22)
    at new ModuleJob (node:internal/modules/esm/module_job:63:26)
    at DefaultModuleLoader.#createModuleJob (node:internal/modules/esm/loader:203:17)
    at DefaultModuleLoader.getJobFromResolveResult (node:internal/modules/esm/loader:156:34)
    at DefaultModuleLoader.getModuleJob (node:internal/modules/esm/loader:141:17) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}
✖ /Users/m0c0j7y/.../test.spec.ts (925.594245ms)
  'test failed'

ℹ tests 1
ℹ suites 0
ℹ pass 0
ℹ fail 1
ℹ cancelled 0
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 945.680527

✖ failing tests:

✖ /Users/m0c0j7y/.../test.spec.ts (925.594245ms)
  'test failed'

[Metab0i]

@vegerot what node version are you using? This error seems similar to #1997