FIX: silverstripe/admin moved jQuery.Entwine and now your site doesn't load because of a third-party dependency that isn't updated yet

LegacyReplacementBackend.php

<?php

namespace Your\Namespace\Requirements;

use SilverStripe\View\Requirements_Backend;

class LegacyReplacementBackend extends Requirements_Backend
{
    public function javascript($file, $options = [])
    {
        // Don't mind the direct coupling - the two work in tandem.  References we can't control are always vendor code.
        return parent::javascript(LegacyReplacementResource::config()->replacements[$file] ?? $file, $options);
    }

    public function block($file)
    {
        return parent::block(LegacyReplacementResource::config()->replacements[$file] ?? $file);
    }
}

LegacyReplacementBackendTest.php

<?php

namespace Your\Namespace\Test\Requirements;

use Your\Namespace\Requirements\LegacyReplacementBackend;
use Your\Namespace\Requirements\LegacyReplacementResource;
use SilverStripe\Core\Config\Config;
use SilverStripe\Dev\SapphireTest;

class LegacyReplacementBackendTest extends SapphireTest
{
    private const OLD = 'silverstripe/admin: old-jquery';

    private const NEW = 'new-jquery';

    public function testLegacyJavascriptIsReplacedAtRuntime()
    {
        Config::modify()->set(LegacyReplacementResource::class, 'replacements', [self::OLD => self::NEW]);
        $backend = new LegacyReplacementBackend();
        $backend->javascript(self::OLD);
        $this->assertArrayHasKey(self::NEW, $backend->getJavascript());
    }
}

LegacyReplacementResource.php

<?php

namespace Your\Namespace\Requirements;

use SilverStripe\Core\Config\Configurable;
use SilverStripe\Core\Manifest\ModuleResourceLoader;

class LegacyReplacementResource extends ModuleResourceLoader
{
    use Configurable;

    private static $replacements = [];

    public function resolveResource($resource)
    {
        return parent::resolveResource($this->config()->replacements[$resource] ?? $resource);
    }
}

LegacyReplacementResourceTest.php

<?php

namespace Your\Namespace\Test\Requirements;

use Your\Namespace\Requirements\LegacyReplacementResource;
use SilverStripe\Core\Config\Config;
use SilverStripe\Dev\SapphireTest;

class LegacyReplacementResourceTest extends SapphireTest
{
    private const OLD = 'silverstripe/admin: old-jquery';

    private const NEW = 'new-jquery';

    public function testLegacyJavascriptIsReplacedAtRuntime()
    {
        Config::modify()->set(LegacyReplacementResource::class, 'replacements', [self::OLD => self::NEW]);
        $moduleResourceLoader = new LegacyReplacementResource();
        $resource = $moduleResourceLoader->resolveResource(self::OLD);
        $this->assertSame(self::NEW, $resource);
    }
}

resource-requirements.yml

---
Name: vendorrequiredresourcereplacements
After: assetscore
---
Your\Namespace\Requirements\LegacyReplacementResource:
  replacements:
    silverstripe/admin:thirdparty/jquery/jquery.js: app/javascript/jquery-3.6.4.min.js
    'silverstripe/admin: thirdparty/jquery/jquery.js': app/javascript/jquery-3.6.4.min.js
    silverstripe/admin:thirdparty/jquery/jquery.min.js: app/javascript/jquery-3.6.4.min.js
    'silverstripe/admin: thirdparty/jquery/jquery.min.js': app/javascript/jquery-3.6.4.min.js
    silverstripe/admin:thirdparty/jquery-entwine/dist/jquery.entwine-dist.js: silverstripe/admin:thirdparty/jquery-entwine/jquery.entwine.js
    'silverstripe/admin: thirdparty/jquery-entwine/dist/jquery.entwine-dist.js': silverstripe/admin:thirdparty/jquery-entwine/jquery.entwine.js
SilverStripe\Core\Injector\Injector:
  SilverStripe\Core\Manifest\ModuleResourceLoader: Your\Namespace\Requirements\legacyReplacementResource
  SilverStripe\View\Requirements_Backend:
    class: Your\Namespace\Requirements\legacyReplacementBackend

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