[wp-trac] [WordPress Trac] #36490: Travis CI cached NPM module maintenance

[WordPress Trac]

#36490: Travis CI cached NPM module maintenance
------------------------------+------------------------------
 Reporter:  netweb            |      Owner:
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Future Release
Component:  Build/Test Tools  |    Version:  4.5
 Severity:  normal            |   Keywords:  has-patch commit
  Focuses:                    |
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 Previously in #36291 via r37058 caching NPM modules in Travis CI was
 added.

 Caching modules in Travis CI the cache needs to be maintained so it
 doesn't grow exponentially with each new, updated, or removed NPM module.

 Including `npm prune` facilitates this by only caching the current modules
 installed by `npm install`

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Ticket URL: <https://core.trac.wordpress.org/ticket/36490>
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