Add sideEffect property in package.json

[beeme1mr]

Tree shakers like Webpack leverage the sideEffect property in libraries package.json. We should confirm that sideEffect: false won't have any negative impact so that tree shaking can be more effective.

[beeme1mr]

Here's another article that discusses tree shaking in more detail.

https://www.smashingmagazine.com/2021/05/tree-shaking-reference-guide/