splitting with multiple entrypoints does not split dependencies into smaller more optimal chunks

I have multiple entrypoints that import from some set of library modules, and I would like to use splitting to spit out "optimal" chunks such that each entrypoint only ends up importing the subset of library modules it needs.

[Here's an example with esbuild](https://hyrious.me/esbuild-repl/?version=0.14.10&mode=build&modules=%5B%5B%22comp1.js%22%2C%22let+count+%3D+0%3B%5Cnexport+default+function+Comp1%28%29+%7B%5Cn%5Ctcount+%2B%3D+1%3B%5Cn%5Ctreturn+%60Comp1+%24%7Bcount%7D%60%3B%5Cn%7D%22%2C0%5D%2C%5B%22comp2.js%22%2C%22let+count+%3D+0%3B%5Cnexport+default+function+Comp2%28%29+%7B%5Cn%5Ctcount+%2B%3D+1%3B%5Cn%5Ctreturn+%60Comp2+%24%7Bcount%7D%60%3B%5Cn%7D%22%2C0%5D%2C%5B%22comps.js%22%2C%22import+Comp1+from+%5C%22.%2Fcomp1%5C%22%3B%5Cnimport+Comp2+from+%5C%22.%2Fcomp2%5C%22%3B%5Cnexport+%7BComp1%2C+Comp2%7D%3B%22%2C0%5D%2C%5B%22main1.js%22%2C%22import+%7BComp1%7D+from+%5C%22.%2Fcomps%5C%22%3B%5Cnconsole.log%28Comp1%29%3B%22%2C1%5D%2C%5B%22main2.js%22%2C%22import+%7BComp2%7D+from+%5C%22.%2Fcomps%5C%22%3B%5Cnconsole.log%28Comp2%29%3B%22%2C1%5D%2C%5B%22main3.js%22%2C%22import+%7BComp1%7D+from+%5C%22.%2Fcomps%5C%22%3B%5Cnconsole.log%28Comp1%29%3B%22%2C1%5D%2C%5B%22main4.js%22%2C%22import+%7BComp2%7D+from+%5C%22.%2Fcomps%5C%22%3B%5Cnconsole.log%28Comp2%29%3B%22%2C1%5D%5D&buildOptions=%7B%22bundle%22%3Atrue%2C%22splitting%22%3Atrue%2C%22format%22%3A%22esm%22%7D), where the result is not optimal; each entrypoint (main*.js) ends up importing all the library module code (Comp1 / Comp2), even though each only needs either Comp1 or Comp2.

Rollup does split this more optimally; [here's the rollup output](https://rollupjs.org/repl/?version=2.71.1&shareable=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).

Is it possible to achieve a result like rollup's with esbuild?

Thanks!

Start by reproducing the linked esbuild example with multiple JavaScript entrypoints and compare its chunks with the linked Rollup output. Done means splitting produces smaller entrypoint-specific chunks so each main*.js includes only the library modules it uses; no implementation files or tests are named in the issue.

Written by the indexing model from the issue text.