Composer autoload not working for classes in theme folder

bedrock
6 
"autoload": {
    "psr-4": {
      "App\\mytheme\\includes\\": "app/themes/mytheme/includes",
      "App\\mytheme\\includes\\utils\\": "app/themes/mytheme/includes/utils",
      "App\\mytheme\\includes\\types\\": "app/themes/mytheme/includes/types",
      "App\\mytheme\\includes\\controllers\\": "app/themes/mytheme/includes/controllers"
    }
  }

These paths are incorrect. Look at the other paths defined here, i.e.:

    "installer-paths": {
      "web/app/mu-plugins/{$name}/": ["type:wordpress-muplugin"],

You’ve also made it more complex than necessary. The following should work:

"autoload": {
    "psr-4": {
      "App\\mytheme\\includes\\": "web/app/themes/mytheme/includes"
    }
  }

Also keep in mind that composer needs to generate autoload maps in order for changes to autoloading to work, so always run composer dump-autoload after you make changes to autoloading.

Finally, why are you loading theme files at the bedrock level? A Sage theme can autoload files with its own composer.json. If you want whatever is in these files at a higher level than the theme, then that feels like it should be a plugin or composer package, not some weird deep dependency on a theme.

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