[wp-trac] [WordPress Trac] #53192: Use hashed/deterministic moduleIDs in Webpack build.

[WordPress Trac]

#53192: Use hashed/deterministic moduleIDs in Webpack build.
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 Reporter:  peterwilsoncc     |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:  5.0
 Severity:  normal            |   Keywords:  has-patch
  Focuses:  javascript        |
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 The current Webpack configuration uses numeric values for the module IDs.
 This can result in apparently minor changes to the code causing a large
 number of files to be rebuilt.

 For example [50431] seems to have triggered a complete rebuild of
 JavaScript files [build50042], the only change in many of the files is the
 module IDs.

 Webpack 4 has an option to generate module IDs based on a hash of the
 file's path. After some quick testing, I think this will reduce the
 frequency of complete JavaScript rebuilds.

 I've attached a patch but I would love a review and some testing from a
 few folk more familiar with Webpack.

 Note: Webpack 5 deprecates the `hashed` option in favour of
 `deterministic`. Reading the documentation, it looks like the algorithm
 has changed in addition to the name.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53192>
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