Mandatory extension key error is shown way too often

[masi]

It runs for any script including the predefined pre and post hooks.

Here an expample of runnin a linter (!):

composer run php-cs-fixer
TYPO3 Extension Package "apache-solr-for-typo3/solrfluidgrouping", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "clickstorm/go_maps_ext", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "friendsoftypo3/typo3db-legacy", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "goran/save_close_ce", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "gridelementsteam/gridelements", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "in2code/fetchurl", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/fake-fal", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/fapalise", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/mageconnect", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-template", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/sierrha", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/tools4net", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-downloadcenter", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-news", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-serialno", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-solr", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/webp", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "sitegeist/sms-responsive-images", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "sourcebroker/urlguard", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "sourcebroker/urlguard", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/pagetree-resizable", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/seo-canonical-guard", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/sluggi", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "yoast-seo-for-typo3/yoast_seo", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "apache-solr-for-typo3/solrfluidgrouping", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "clickstorm/go_maps_ext", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "friendsoftypo3/typo3db-legacy", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "goran/save_close_ce", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "gridelementsteam/gridelements", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "in2code/fetchurl", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/fake-fal", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/fapalise", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/mageconnect", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-template", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/sierrha", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/tools4net", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-downloadcenter", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-news", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-serialno", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-solr", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/webp", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "sitegeist/sms-responsive-images", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "sourcebroker/urlguard", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/pagetree-resizable", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/seo-canonical-guard", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/sluggi", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "yoast-seo-for-typo3/yoast_seo", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "apache-solr-for-typo3/solrfluidgrouping", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "clickstorm/go_maps_ext", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "friendsoftypo3/typo3db-legacy", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "goran/save_close_ce", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "gridelementsteam/gridelements", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "in2code/fetchurl", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/fake-fal", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/fapalise", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/mageconnect", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-template", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/sierrha", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/tools4net", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-downloadcenter", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-news", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-serialno", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/p2n-shrek-solr", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "plan2net/webp", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "sitegeist/sms-responsive-images", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "sourcebroker/urlguard", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/pagetree-resizable", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/seo-canonical-guard", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "wazum/sluggi", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
TYPO3 Extension Package "yoast-seo-for-typo3/yoast_seo", does not define extension key in composer.json.
Specifying the extension key will be mandatory in future versions of TYPO3 (see: https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ExtensionArchitecture/ComposerJson/Index.html#extra)
> ./vendor/bin/php-cs-fixer fix --dry-run -v --diff --config=php-cs-fixer.config.php
PHP CS Fixer 2.18.2 Remote Void by Fabien Potencier and Dariusz Ruminski
Runtime: PHP 7.4.15
Loaded config default from "php-cs-fixer.config.php".
Using cache file "/app/var/cache/php-cs-fixer.json".
................................................................................
Legend: ?-unknown, I-invalid file syntax (file ignored), S-skipped (cached or empty file), .-no changes, F-fixed, E-error

Checked all files in 3.082 seconds, 18.000 MB memory used

If I do composer install with all the hooks I get more than 2000 lines for that warning that I cannot get rid of other then bugging the extension authors. That's rather abusive.

[mbrodala]

A small improvement was done via #113 already. As noticed there it is the responsibility of the extension package authors to fix this.

Aside from that a PR to collect the extension keys and output a single combined message is more than welcome.

[masi]

Another idea I had is that the message(s) are only shown once by using an in-memory cache (eg static members).

[helhum]

Except the PHP compatibility with 8.0, there are no changes in version 3.1 compared to 3.0, so you have the option to downgrade to 3.0 without loosing anything.

Regarding gathering the messages in a static member: fine with me. PR is welcome here.

[masi]

@jonaseberle Thank you