Module resolution: node20 not working in typescript@5.9-beta

[Shinigami92]

Demo Repo

faker-js/playground#50

Which of the following problems are you reporting?

Something else more complicated which I'll explain in more detail

Demonstrate the defect described above with a code sample.

neither

    "module": "Node20",
    "moduleResolution": "Node20"

nor

--moduleResolution Node20 --module Node20

seems to work

Run tsc --showConfig and paste its output here

❯ pnpm tsc --moduleResolution node20 --module node20 --showConfig
error TS6046: Argument for '--moduleResolution' option must be: 'node10', 'classic', 'node16', 'nodenext', 'bundler'.

Run tsc --traceResolution and paste its output here

❯ pnpm tsc --moduleResolution node20 --module node20 --traceResolution
error TS6046: Argument for '--moduleResolution' option must be: 'node10', 'classic', 'node16', 'nodenext', 'bundler'.

Paste the package.json of the importing module, if it exists

{
"name": "faker-cjs-test",
"version": "1.0.0",
"private": true,
"type": "commonjs",
"scripts": {
"all": "pnpm run-s build test",
"build": "pnpm run-s build:node10 build:node20 build:bundler",
"build:node10": "tsc",
"build:node20": "tsc --project tsconfig.node20.json --moduleResolution Node20 --module Node20",
"build:bundler": "tsc --project tsconfig.bundler.json",
"test": "pnpm run-s test:js test:ts",
"test:js": "node index.js",
"test:ts": "pnpm run-s test:ts:node10 test:ts:node20 test:ts:bundler",
"test:ts:node10": "tsx index.ts",
"test:ts:node20": "tsx --tsconfig tsconfig.node20.json index.ts",
"test:ts:bundler": "tsx --tsconfig tsconfig.bundler.json index.ts"
}
}

Paste the package.json of the target module, if it exists

{
"name": "faker-cjs-test",
"version": "1.0.0",
"private": true,
"type": "commonjs",
"scripts": {
"all": "pnpm run-s build test",
"build": "pnpm run-s build:node10 build:node20 build:bundler",
"build:node10": "tsc",
"build:node20": "tsc --project tsconfig.node20.json --moduleResolution Node20 --module Node20",
"build:bundler": "tsc --project tsconfig.bundler.json",
"test": "pnpm run-s test:js test:ts",
"test:js": "node index.js",
"test:ts": "pnpm run-s test:ts:node10 test:ts:node20 test:ts:bundler",
"test:ts:node10": "tsx index.ts",
"test:ts:node20": "tsx --tsconfig tsconfig.node20.json index.ts",
"test:ts:bundler": "tsx --tsconfig tsconfig.bundler.json index.ts"
}
}

Any other comments can go here

In https://github.com/faker-js/faker we are drafting a beta v10 which will only expose esm in the future.

• chore(release): 10.0.0-beta.0 faker-js/faker#3565
  We have a playground https://github.com/faker-js/playground where we have a PR to test out the @faker-js/faker project via pnpm overrides
• chore: update faker to v10.0.0-beta.0 faker-js/playground#50

For the cjs support, we want to try out the node20 module from ts5.9 as described here https://devblogs.microsoft.com/typescript/announcing-typescript-5-9-beta/#support-for---module-node20

But --moduleResolution node20 --module node20 results in the provided error

---

extracted out of #61648 (comment)

[Shinigami92]

I think I got my mistake... there is no --moduleResolution Node20 but only --moduleResolution NodeNext...

The documentation/blog article was a bit confusing here due to the node* mentioning