webpack + babel. How to polyfill Nullish Coalescing (??) in a bundle (does not polyfill only libraries)?

Question

webpack

The Nullish Coalescing operator (??) is not polyfilled in the lib bundle
.
Compilation inside the project proceeds as required

Answer 1

If the application code is correctly polyfilled, then an additional plugin is not needed (it is already in the package lock, bundled with the babel preset).
And what you need is to include for the polyfill plugins in node_modules that contain unsupported (not transpiled) code.
This is done in the babel-loader configuration (node_modules are usually excluded). https://webpack.js.org/loaders/babel-loader/#usage