composer/tests/Composer/Test/Fixtures/functional/plugin-autoloading-only-loads-dependencies/plugin-a/composer.json

{
    "name": "plugin/a",
    "version": "1.0.0",
    "require": {
        "regular/dep": "*",
        "composer-plugin-api": "^2"
    },
    "autoload": {
        "classmap": ["PluginA.php"]
    },
    "type": "composer-plugin",
    "extra": {
        "class": "PluginA"
    }
}