Ability to disable creating CJS dist/index.js file

[zhaoyao91]

Current Behavior

I have customized the tsdx.config.js as such

// Not transpiled with TypeScript or Babel, so use plain Es6/Node.js!
module.exports = {
  // This function will run for each entry/format/env combination
  rollup(config, options) {
    config.preserveModules = true;
    config.output.file = undefined;
    config.output.dir = `${__dirname}/${config.output.format}`;
    console.log(config);
    return config; // always return a config.
  },
};

Hope it to generate files that match the structure of sources in ${format} dir .

However, there always is a dist/index.js file, which is not desired.

Desired Behavior

Only esm and cjs dirs are generated, no dist dir.

Suggested Solution

Support some customization to allow the pattern of keeping the structure of source files.

Who does this impact? Who is this for?

?

Describe alternatives you've considered

As cjs is not for the future, I may disable generating cjs modules to workaround it for some time. But it is not perfect.

[agilgur5]

dist/index.js (or something like it) is necessary for determining whether to use dev or prod CJS builds. It is exclusively for CJS, so if you disable CJS, it won't be produced. With multi-entry or preserveModules, it only gets created once though, whereas it should be created for each CJS module.

With #367 you can do something like tsdx build --entry src/**/*.ts and that will create one for each CJS module, but it's not the same as preserveModules as it creates separate bundles for each file. Might be able to add preserveModules on top of the changes in #367 and that might work, but I'm not really sure.

Related to #367, #175 , #276 , #299, and #321 . I believe the example here improves on my workaround for #321 as well, though I haven't tested it myself. Based on all the issues, seems like TSDX should have better support for multi-entry and preserveModules, which are related and may use similar code to achieve, but are not the same.

[agilgur5]

So as I mentioned in #276 (comment) , the use of preserveModules for CJS causes some issues and I'm not sure it provides any tree-shaking benefits (because it's CJS) either.

preserveModules also isn't meant for creating multiple entries, there is a separate feature for that that is leveraged by #367, and #367 handles creating the dev/prod switch for each entry too.

Going to close this as won't fix because there isn't really a need to disable creating dist/index.js and it is necessary to be able to switch between dev/prod CJS. If you're not using CJS, you don't need to switch between dev/prod CJS, and it won't be generated already.

Support some customization to allow the pattern of keeping the structure of source files.

Please see #276 (comment) for a better tsdx.config.js for preserveModules for ESM. It leverages output.entryFileNames to have similar naming as what TSDX currently has.
#535 creates a flag for this as well that is similar to the tsdx.config.js workaround in that comment but it's still WIP.