Examples - how to run them from CLI (newbie)

[anrl]

Hi

I am trying to run the arithmetic example. I did the npm install from the root of the project and also the
arithmetic example directory. I still don't have the ../out/cli/cli.js created. Am I missing some setup?
Any help would be deeply appreciated.

[JohannesMeierSE]

Hello @anrl,

thanks for your feedback!

For me, the following worked:

git clone ...
cd langium
npm install
npm run build
cd examples/arithmetics
node ./bin/cli eval example/example.calc

... and produced this result:

line 14: 2 * c ===> 16
line 15: b % 2 ===> 1
line 18: Root(D, 3) ===> 4.999999999999999
line 19: Root(64, 3) ===> 3.9999999999999996
line 20: Sqrt(81) ===> 9

Could you try this on your side?
Then I would create a PR for updating the documentation!

[msujew]

@anrl I believe there are two steps that are missing/incorrect that are correctly mentioned in the post by @JohannesMeierSE:

1. You only need to run the npm install once in the root directory. We use npm workspaces to manage all of our npm projects as one monorepo.
2. You need to run npm run build to actually generate the JavaScript code from our TypeScript sources.

We have a contributing guide that also explains how to build/contribute to this repo.

[anrl]

Thanks a lot!
npm install
npm run build
at the root of langium directory did it. Now, I am able to run the examples!

[JohannesMeierSE]

Thanks for your feedback, I fixed this issue in the documentation for all four examples: #1889