Automatically transform only ESM packages under node_modules

[fregante]

I'm using Jest without the experimental ESM support, this means SWC must run on ES Module dependencies. Ideally I'd just let it transform the entire node_modules folder but that slows down the tests considerably, so I have to use transformIgnorePatterns with node_modules plus an increasingly-long list of manually-excluded ES Modules. I'm now at 24+.

https://github.com/pixiebrix/pixiebrix-extension/blob/fee28636efcad73745a7cc8d4c52649dd31db422/jest.config.json#L7-L22

Is there a way to configure SWC via .swcrc to automatically skip CJS modules? That would allow me to avoid transformIgnorePatterns altogether.

I'll paste the actual error for googlability:

./node_modules/linkify-urls/index.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){
   import createHtmlElement from 'create-html-element';                                                                                      
   ^^^^^^
   SyntaxError: Cannot use import statement outside a module