fix: polling usage in watchFiles option

[anshumanv]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

yet to

Motivation / Use-Case

Fix #3365

Breaking Changes

no

Additional Info

[anshumanv]

Not sure how to test this, maybe mock chokidar and check it's getting called by the correct config?

[alexander-akait]

maybe mock chokidar

Yep, right direction

[codecov]

Codecov Report

Merging #3366 (152ebb5) into master (879d1b0) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3366      +/-   ##
==========================================
+ Coverage   95.67%   95.76%   +0.09%     
==========================================
  Files          33       33              
  Lines        1295     1299       +4     
  Branches      377      381       +4     
==========================================
+ Hits         1239     1244       +5     
+ Misses         52       51       -1     
  Partials        4        4              

Impacted Files	Coverage Δ
lib/Server.js	96.25% <100.00%> (+0.24%)	⬆️

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[alexander-akait]

/cc @snitin315

[snitin315]

Looks Good!