The next PRs, drop Node.js 10 and change CI, then let's drop webpack v4 and workaround for webpack v4 (search TODO)

The next PRs, drop Node.js 10 and change CI, then let's drop webpack v4 and workaround for webpack v4 (search TODO)

On it.

Need rewrite some tests and delete olds

Also webpack-dev-server is not yet released with new cli logic and options.

Hope I will do the next release today/tomorrow (i.e. rc), need finish migration guide, and I am working on it, sorry for delay, really a lot of issues

@snitin315 Thanks for your update.

I labeled the Pull Request so reviewers will review it again.

@alexander-akait Please review the new changes.

Hmm, this will also drop --hot support for webpack-dev-server@v3, but I think it's fine for next to drop webpack-4 and webpack-dev-server v3.

Codecov Report

Merging #2833 (b1e07f9) into next (104b9c4) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             next    #2833      +/-   ##
==========================================
- Coverage   95.01%   94.97%   -0.04%     
==========================================
  Files          31       31              
  Lines        1704     1692      -12     
  Branches      496      491       -5     
==========================================
- Hits         1619     1607      -12     
  Misses         85       85              

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