TYPO3 Extension composer.json essentials

composer.json

{
  "name": "vendor/ext-key",
  "description": "Essential composer.json attributes",
  "keywords": ["typo3", "extension", "composer.json"],
  "homepage": "http://helhum.io",
  "authors": [
    {
      "name": "Helmut Hummel",
      "email": "info@helhum.io"
    }
  ],
  "license": "GPL-2.0-or-later",
  "type": "typo3-cms-extension",
  "require": {
    "typo3/cms-core": "^9.5 || ^10.3",
    "typo3/cms-frontend": "^9.5 || ^10.3",
    "typo3/cms-scheduler": "^9.5 || ^10.3"
  },
  "replace": {
    "typo3-ter/ext-key": "self.version"
  },
  "autoload": {
    "psr-4": {
      "Helhum\\ExtKey\\": "Classes/"
    }
  },
  "extra": {
    "typo3/cms": {
      "extension-key": "ext_key"
    }
  }
}

I encountered problems on packagist related to the replace-section. The part "ext_key": "self.version", was reported to not to be compatible with upcoming versions from composer. Looking at the composer configuration from sys_note it looks like the part could be left out when adding an extra-section:

	"extra": {
		"typo3/cms": {
			"extension-key": "sys_note"
		}
	},

@buepro updated the composer.json to be in line with current requirements