README: Need clarification regarding the first two rules

[nyngwang]

Documentation Is:

• Missing
• Needed
• Confusing
• Not Sure?

Please Explain in Detail...

There are some caveats listed in README.md. Specifically, my concern around it is the first rule and the third rule:

Loaders running in a worker pool are limited. Examples:

Loaders cannot emit files.
Loaders cannot use custom loader API (i. e. by plugins).
Loaders cannot access the webpack options.

Confusion on Rule 1

Isn't that babel-loader also emitting files for webpack eventually? In the example given in the readme, it mentioned that it is expected to work with babel-loader. I need some clarifications here as I have some misunderstandings.

Confusion on Rule 3

In my case, I'm using babel-loader with some custom options like rootMode: 'upward', and in my babel.config.js I also included some third-party plugins like react-refresh/babel for HMR with the corresponding plugin in my webpack.config.js. Does this rule mean that babel-loader could not access these plugins?

Your Proposal for Changes

No. I just need some clarification.

[nyngwang]

@ersachin3112 @alexander-akait Could you please help? I want to know whether or not thread-loader would read my options of babel-loader in webpack.config.js. Thank you.

[nyngwang]

I tried thread-loader anyway regardless of its correctness as mentioned above. In the end, it increased my time of compilation. I did try warmup and all kinds of combinations with the settings. The results are all the same: slower.

[alexander-akait]

Yes, it will be faster only for really big projects, because a creation of threads are very expensive