TreeShaking not working

[priyang12]

I have built a package with tsdx and when i analyzed the compiled package with the source mapper it's not tree-shaking the unnecessary files.

I used react-icons in one of the files and then build the package the build code size did not increase but when i used the package the react build imported all the icons from react-icon/fa. also when i build with parcel and check the build size and same happend it increased the project build by a lot.

package build

parcel build

am I missing something about ESM and CJS. i know that cjs don't tree shake so do i have to setup something for tree shake to work??