feat(compare-func): pass cacheData to the compare() function

[pat841]

Also added caching the source file.

This PR contains a:

• [ ] bugfix
• [X] new feature
• [ ] code refactor
• [X] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

I needed access to the cached data object as well as the cached source file to support certain cache conditions based on the source code.

Breaking Changes

None.

[codecov[bot]]

Codecov Report

Merging #98 into master will not change coverage. The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   83.09%   83.09%           
=======================================
  Files           2        2           
  Lines         142      142           
  Branches       21       21           
=======================================
  Hits          118      118           
  Misses         24       24           

Impacted Files	Coverage Δ
src/index.js	82.97% <50.00%> (ø)

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[alexander-akait]

need fix errors on CI

[pat841]

@evilebottnawi -- All set.

[alexander-akait]

Sorry for delay, can you describe a case can when you need it?

[mf-pherlihy]

Sorry for delay, can you describe a case can when you need it?

@evilebottnawi -- We use the https://github.com/afterwind-io/preprocessor-loader module which allows us to runs certain code blocks under given conditions. However, the cache-loader does not pick up these files that have these directives so we pass the files content to the compare function and check if they exist. If they do, we avoid caching.