Skip to content

Nim: Add info about compiling to JS and running. #2682

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
moigagoo wants to merge 2 commits into
base: master
Choose a base branch
from
+14 −2
Open

Nim: Add info about compiling to JS and running. #2682

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
18da31a
Nim: Add info about compiling to JS and running.
moigagoo Jul 24, 2026
279743a
Revert README.md.
moigagoo Jul 24, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 14 additions & 2 deletions nim/content.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,10 +18,22 @@ $ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app %%IMAGE%% nim c -r main

## Compile to JavaScript

Nim can compile to JavaScript. This image includes Node.js to serve as the runtime:
Nim can compile to JavaScript:

```console
$ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app %%IMAGE%% nim js -r main.nim
$ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app %%IMAGE%% nim js main.nim
```

To compile and run, use a multi-stage Dockerfile with Node.js:

```dockerfile
FROM %%IMAGE%% AS builder
COPY . .
RUN nim js -o:app.js src/app.nim

FROM node:latest
COPY --from=builder /usr/src/app/app.js .

@tianon tianon Jul 27, 2026

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

FYI, this is encoding the implicit assumption of WORKDIR /usr/src/app in the nim image (which is fine, but something you should be aware of / be doing intentionally if you're going to do it, since it makes that value slightly "stickier" to document it this way)

@moigagoo moigagoo Jul 28, 2026

Copy link
Copy Markdown
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

True, and I was somewhat conflicted with this line... Initially, there was WORKDIR /app in both the builder and the runner images, which does make things more explicit but also noisier.

I think that as an example that is intended to be modified for your needs (I mean, you probably don't have an app called app anyway, duh) this is fine.

@moigagoo moigagoo Jul 28, 2026

Copy link
Copy Markdown
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Looks fine to me -- do you want to wait for your other PR to merge this, or merge this as-is since it's correct even without image changes?

I'd rather have that merged now as is.

CMD ["node", "app.js"]
```

## Managing packages with Nimble
Expand Down