Is there a way to use this tool like TSC?

[kfirba]

Hey,

I'm trying to figure out how to use @swc-node/core, but not sure how I would use it. This tool provides 2 functions that receive an input string only.

Is there a way I can define an entry file, and from there, it will automatically transpile everything that this file needs (recursively)?

Maybe write some custom code for it?

Thanks

[stefee]

It seems like @swc-node/core is just a configuration layer around @swc/core - I have been using @swc/cli to do what you are describing and have a small .swcrc file, and this has had good results.

https://swc.rs/docs/usage-swc-cli/

You can use the options function in @swc-node/core as inspiration for your .swcrc file:

https://github.com/Brooooooklyn/swc-node/blob/fbfe8d6cf4cd62528eea920a724ccba00b46ddec/packages/core/index.ts#L26

My .swcrc for compiling an Next.js + Express server written in TypeScript simply contains this:

{
  "jsc": {
    "parser": {
      "syntax": "typescript"
    },
  },
  "module": {
    "type": "commonjs"
  }
}

I then have the following build scripts:

    "build:server": "swc server --config-file server/.swcrc --out-dir dist/server --copy-files",
    "build:server:watch": "swc server --config-file server/.swcrc --out-dir dist/server --copy-files --watch",

[ftzi]

@stefee do you know how to use it like ts-node-dev, to run the TS code and restart on changes?

[seangenabe]

After following this issue, ts-node itself has since added support for swc, so there's that.

[stefee]

@SrBrahma I am using nodemon to watch the dist directory, and then npm-run-all (run-p) to run this in parallel with build:

    "dev": "run-p build:server:watch start:watch",
    "build:server:watch": "swc server --config-file server/.swcrc --out-dir dist/server --watch",
    "start:watch": "nodemon --watch dist/server dist/server/index.js"

Note: I am building a specific directory called server and my entrypoint is server/index.ts in case that's not clear. For example if you are building the src dir with src/exec.ts entrypoint directory and your .swcrc is at root, then you would do this instead:

    "dev": "run-p build:server:watch start:watch",
    "build:server:watch": "swc src --out-dir dist --watch",
    "start:watch": "nodemon --watch dist dist/exec.js"