feat: invalidate cache

[alexander-akait]

Steps:

• Add ability to determinate own cache identifier.
• Invalidate cache after cache-loader updated.
• Invalidate cache after cache-loader options changed.
• Invalidate cache if environment changed.
• Invalidate cache if loader in chain updated.
  As sokra says:

"postinstall": "rm -rf .cache-loader"

We can just add this in README.

• Search solution for loaders using fs based configuration files, maybe just add docs.
  As sokra says:

configuration files -> loaders should add these files to their dependencies (with `this.addDependency`). dependencies' mtimes are stored by the cache-loader

Partial fixed: #3

[codecov]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is 0%.

@@         Coverage Diff         @@
##           master   #9   +/-   ##
===================================
  Coverage       0%   0%           
===================================
  Files           2    2           
  Lines          80   85    +5     
  Branches       12   12           
===================================
- Misses         68   74    +6     
+ Partials       12   11    -1

Impacted Files	Coverage Δ
src/index.js	0% <0%> (ø)	⬆️

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[STRML]

This is going to be the same for every call to pitch() so it would make sense to define it outside the fn.

[alexander-akait]

@STRML done

[STRML]

Thanks - doesn't appear pushed though

[michael-ciniawsky]

@evilebottnawi Can't the whole defaultOptions block be moved for some reason ? 🙃

[alexander-akait]

@michael-ciniawsky oh, yep, your are right

[michael-ciniawsky]

What's missing here ? babel-loader #60 was merge a while ago 😛

[michael-ciniawsky]

Adressing @STRML comment maybe a good idea :)

[michael-ciniawsky]

Removing the WIP seems to be good to go ?

[sokra]

I would change this to:

const hash = digest(remainingRequest + cacheIdentifier);

Faster. Options don't need to be included.

[sokra]

Thanks