[wp-trac] [WordPress Trac] #49460: wp-config gets cleaned out from build folder on rebuild

[WordPress Trac]

#49460: wp-config gets cleaned out from build folder on rebuild
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 Reporter:  isabel_brison     |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:  trunk
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 If there is a `wp-config.php` file in the `build` folder, it gets cleaned
 out when `npm run build` is run.

 This has become a problem because the newest version of `@wordpress/env`
 allows us to setup a unified core/gutenberg development environment from
 the build folder of our local `wordpress-develop`. In doing so, it writes
 a `wp-config.php` to that folder, which gets wiped out on running `npm run
 build`, destroying the development environment.

 In testing a fix for this issue, I came across an existing bug in the
 `clean:files` task: because `BUILD_DIR` gets prepended to the strings in
 the `buildFiles` array, if any of those strings is a negation, it won't
 work because the `!` will now be in the middle of the string, instead of
 at the start.

 I'm adding a patch for both the main issue and the bug.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49460>
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