refactor: use includes where appropriate

[dnalborczyk]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

[codecov]

Codecov Report

Merging #4412 (e97c2b7) into master (213e721) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4412      +/-   ##
==========================================
+ Coverage   98.72%   98.75%   +0.02%     
==========================================
  Files         204      204              
  Lines        7322     7322              
  Branches     2080     2079       -1     
==========================================
+ Hits         7229     7231       +2     
+ Misses         34       33       -1     
+ Partials       59       58       -1     

Impacted Files	Coverage Δ
browser/path.ts	78.57% <100.00%> (+1.64%)	⬆️
cli/run/index.ts	100.00% <100.00%> (ø)
src/Chunk.ts	100.00% <100.00%> (ø)
src/finalisers/iife.ts	100.00% <100.00%> (ø)
src/utils/getExportMode.ts	100.00% <100.00%> (ø)
src/utils/options/mergeOptions.ts	100.00% <100.00%> (ø)
src/utils/path.ts	100.00% <100.00%> (+33.33%)	⬆️
src/watch/watch.ts	99.05% <100.00%> (ø)

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