fix: no serve when dev-server is false

[rishabh3112]

What kind of change does this PR introduce? Fix

Did you add tests for your changes? Yup

If relevant, did you update the documentation? Yes

Summary No dev server when devServer: false is supplied.

Does this PR introduce a breaking change? Nope

Other information /cc @alexander-akait

[codecov[bot]]

Codecov Report

Merging #2947 (c18b084) into master (bd661fb) will increase coverage by 0.02%. The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2947      +/-   ##
==========================================
+ Coverage   90.87%   90.89%   +0.02%     
==========================================
  Files          22       22              
  Lines        1688     1692       +4     
  Branches      486      488       +2     
==========================================
+ Hits         1534     1538       +4     
  Misses        154      154              

Files	Coverage Δ
packages/serve/src/index.ts	79.46% <ø> (ø)
packages/webpack-cli/src/webpack-cli.ts	92.63% <100.00%> (+0.02%)	:arrow_up:

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update bd661fb...c18b084. Read the comment docs.

[rishabh3112]

@alexander-akait devServer is object in schema, should change/publish that first to support devServer: false.

[alexander-akait]

We should return before using schema

[rishabh3112]

We should return before using schema

We should not read configuration without validating against schema ideally.

[alexander-akait]

We need to revert this, because we should not exit, just run a regular compilation with a warning, I will fix it

[alexander-akait]

Also webpack build with devServer: false should work too without any problems