[documentation] documentation on how to compile dart to js for a non-web target with webdev build

[iapicca]

I want to compile dart to js for a non-web target (eg. fermyon/js, node)

I'm told it's possible with 2 possible approaches:

1. webdev build --no-release suggested here
2. dart compile js --server-mode suggested here with a 3rd party node_preamble

it would be nice to have some documentation on how to achieve this the 1. approach.

I admit that this is a skill issue rather than a dart issue but maybe I'm not the only developer facing this and a minimal example would be great

here is a reproducible setup/example using node (repo)

node example

- set up node dependencies ```sh npm init -y && \ npm install express && \ npm install --save-dev typescript @types/node @types/express ts-node-dev ``` - create the file `tsconfig.json` with the code below ```json { "compilerOptions": { "allowJs": true, "target": "ES6", "module": "commonjs", "strict": true, "esModuleInterop": true, "skipLibCheck": true, "outDir": "./dist", "rootDir": "./src" }, "include": ["src"] } ``` - create the file `src/greeting.js with the following code ```js export function greeting() { return "Hello from JS" } ``` - create the file `src/index.ts` with the code below ```ts import express, { Request, Response } from 'express'; import { greeting } from './greeting.js'; const app = express(); const port = 3000; app.get('/', (req: Request, res: Response) => { res.send(greeting()); }); app.listen(port, () => { console.log(`Server is running on http://localhost:${port}`); }); ```

how can I create an equivalent

String greeting() => 'Hello from Dart';

import it and use it in index.ts?

notes

• packages from node_interop's family seem to me that are "replacing" node rather than actually "interop"
• stack overflow question

cc @maks & @sigmundch from https://github.com/dart-lang/sdk/issues/53884 @nex3 I've been told on Twitter that you have experience with this use case from sass

[nex3]

From the Sass end, we've built the cli_pkg package to encapsulate the logic for releasing a package to various platforms, including as a Node.js library. See the npm docs and the pkg.jsModuleMainLibrary documentation for details.