Bundle size doubles compares to webpack

[fellmann]

🐛 bug report

When bundling a simple js file that imports mobx and keycloak-js, the bundle size doubles, compared to webpack.

🎛 Configuration (.babelrc, package.json, cli command)

I have boiled the problem down to a minimal working example: https://github.com/fellmann/parcel2-webpack-demo

🤔 Expected Behavior

The bundle size should be roughly the same as the webpack generated bundle. Also, mobx should not change its bundle size when keycloak-js is added.

😯 Current Behavior

As soon as keycloak-js is imported on top of mobx, the bundle size doubles.

💁 Possible Solution

🔦 Context

This might affect all frontend apps that use keycloak-js.

💻 Code Sample

https://github.com/fellmann/parcel2-webpack-demo

🌍 Your Environment

Software	Version(s)
Parcel	2.2.1
Node	16.13.2
Operating System	Win 10 64bit

[mischnic]

This is caused by these evals: https://github.com/emn178/js-sha256/blob/189bb9b03782b80e59516dfbea78f16b5d9754ce/src/sha256.js#L84 (so this is not caused by keycloak itself but its dependency js-sha256)
which deopts Terser into not being able to minify variable names.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs.