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https://roots.io/bedrock/docs/mu-plugin-autoloader/
WordPress Must-use Plugin Autoloader | Bedrock Docs | Roots
Bedrock's autoloader lets you install regular plugins as must-use plugins via Composer, ensuring critical plugins always load without user control.
bedrock docs rootsmust usewordpresspluginautoloader
https://developer.jetpack.com/docs/jetpack-development/autoloader/
Autoloader – Jetpack Developer Resources
Whatever project you’re working on in the Jetpack Monorepo, you may have to use the Jetpack Autoloader. For example, if you’re working on a Composer package...
jetpack developer resourcesautoloader
https://www.php-fig.org/psr/psr-4/
PSR-4: Autoloader - PHP-FIG
We're a group of established PHP projects whose goal is to talk about commonalities between our projects and find ways we can work better together.
php figpsr4autoloader