Make ESLint rules stricter

[kachkaev]

Includes a few additional dev setup tweaks to minimize diff in #36

[codecov]

Codecov Report

Base: 94.68% // Head: 94.68% // No change to project coverage 👍

Coverage data is based on head (9f37a0d) compared to base (88e7385).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   94.68%   94.68%           
=======================================
  Files           5        5           
  Lines          94       94           
  Branches       14       14           
=======================================
  Hits           89       89           
  Misses          4        4           
  Partials        1        1           

Impacted Files	Coverage Δ
src/helpers.ts	88.88% <ø> (ø)
src/cache.ts	100.00% <100.00%> (ø)
src/index.ts	75.00% <100.00%> (ø)
src/parser.ts	88.23% <100.00%> (ø)
src/printer.ts	100.00% <100.00%> (ø)

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