refactor: code

[alexander-akait]

What kind of change does this PR introduce?

refactor

Did you add tests for your changes?

Existing

If relevant, did you update the documentation?

No

Summary

prepare before #2356

Does this PR introduce a breaking change?

No

Other information

We can return syntax webpack ./one.js ./two.js ./two.js [options], also for watch/build/serve commands

[codecov]

Codecov Report

Merging #2366 (aa1d334) into master (78074ca) will decrease coverage by 0.12%.
The diff coverage is 96.00%.

@@            Coverage Diff             @@
##           master    #2366      +/-   ##
==========================================
- Coverage   70.22%   70.09%   -0.13%     
==========================================
  Files          48       48              
  Lines        2126     2117       -9     
  Branches      548      548              
==========================================
- Hits         1493     1484       -9     
  Misses        633      633              

Impacted Files	Coverage Δ
packages/webpack-cli/lib/webpack-cli.js	90.92% <96.00%> (-0.12%)	⬇️

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