feat(purge): handle custom srcDir and support TS

[atinux]

Resolves #114

[codecov]

Codecov Report

Merging #170 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #170   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           42        43    +1     
  Branches         8         8           
=========================================
+ Hits            42        43    +1     

Impacted Files	Coverage Δ
lib/files/tailwind.config.js	100.00% <100.00%> (ø)
lib/module.js	100.00% <100.00%> (ø)

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