[wp-trac] [WordPress Trac] #63354: Unhappy Mustache Deprecations in PHP 8.4

[WordPress Trac]

#63354: Unhappy Mustache Deprecations in PHP 8.4
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 Reporter:  SirLouen          |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:  trunk
 Severity:  normal            |   Keywords:  needs-patch needs-testing-info
  Focuses:                    |
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 == Bug Report
 === Description
 When running `npm run env:install` a ton of deprecation messages appear
 regarding Mustache Engine. Maybe just upgrading Mustache would be
 sufficient.

 === Environment
 - WordPress: 6.9-alpha-60093-src
 - PHP: 8.4.6
 - Server: nginx/1.27.5
 - Database: mysqli (Server: 8.4.5 / Client: mysqlnd 8.4.6)
 - Browser: Chrome 135.0.0.0
 - OS: Windows 10/11
 - Theme: Twenty Twenty-Five 1.2
 - MU Plugins: None activated
 - Plugins:
   * Test Reports 1.2.0

 === Steps to Reproduce
 1. Download `wordpress-develop`
 2. Edit the .env to go to PHP 8.4 (`LOCAL_PHP=8.4-fpm`)
 3. Run `npm run env:install`
 4. 🐞 Deprecation notices appear

 === Supplemental Artifacts
 Log: https://gist.github.com/SirLouen/8b2690aa86624f9e80e7df048e1426f4

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Ticket URL: <https://core.trac.wordpress.org/ticket/63354>
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