Production version contains unnecessary files

[kalinchernev]

Describe the bug
The published npm package contains unnecessary files for production use.

To Reproduce
Download the package and open its folder in node_modules

Expected behavior
Only production files are necessary: dist, index.d.ts, license, readme and package.json

Screenshots
See this

Additional context

.npmignore file can be used to list src, webpack and eslint config, etc. https://docs.npmjs.com/cli/v8/using-npm/developers#testing-whether-your-npmignore-or-files-config-works