[wp-trac] [WordPress Trac] #43558: Add composer.json file

[WordPress Trac]

#43558: Add composer.json file
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 Reporter:  clarinetlord      |       Owner:
     Type:  enhancement       |      Status:  reopened
 Priority:  normal            |   Milestone:  Awaiting Review
Component:  Build/Test Tools  |     Version:  trunk
 Severity:  normal            |  Resolution:
 Keywords:                    |     Focuses:
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Comment (by netweb):

 Copying in @GaryJ's ticket:23912#comment:98 for further context:

 > Treating WordPress as a dependency of a site may not be the prevalent
 use case across all WP installs, but it is popular and handy for those
 that have taken that approach. I personally use
 [http://wecodemore.github.io/wpstarter/ WPStarter] but other wrappers of
 WP are available too.
 >
 > Something not mentioned so far, and that has changed since this ticket
 has started, is the use of PHP_CodeSniffer. Obviously, PHPUnit has been in
 use since before this ticket as well.
 >
 > These core development dependencies should be documented in the
 `composer.json` `require-dev` section, so that we
 [https://12factor.net/dependencies explicitly declare and isolate
 dependencies]. Running versions earlier than PHP_CodeSniffer 3.2 will
 cause different results than 3.2+, for instance. WP should not be relying
 on globally installed dependencies of varying versions.
 >
 > The `.travis.yml` files shows PHPUnit can be used at version 4, 5 or 6,
 depending on the PHP version available - and that's great, but get it down
 in a `composer.json`, and a `composer install` means that the switch
 statement can be dropped, and developers working locally can get the right
 version too.
 >
 > Whatever the rest of the `composer.json` does or doesn't do for the
 external benefit of those ''consuming'' this package, having a simple
 `composer.json` which lists the development dependencies gives internal
 benefit to ''contributors'' and automated tools.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43558#comment:4>
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