Deprecation removals in v9.0

[yuri]

Deprecations are easier to deal with when using a decent IDE and static analysis.

For IDE, I highly recommend PHPStorm. The price is not high and the feature set is immense.

To run static analysis from the ext-template repository, run:

node build --copy; node build --composer-install; site/vendor/bin/phpstan

Note that the "composer-install" is not necessary if your extension does not have additional composer packages.

It's worth to set a lower level initially and then gradually raise as issues get fixed.

[yuri]

All deprecations that were planned to be removed in v9.0 will be actually removed. Most of them are deprecations since v6.0.

Backend removals: https://github.com/espocrm/espocrm/issues/3203
Frontend removals: https://github.com/espocrm/espocrm/issues/3202

The release is planned for 20 January 2025.

You will need to fix customizations before upgrading. The before-upgrade script should check some incompatibilities not allowing to upgrade, but it won't work for all cases.

Feel free to ask questions regarding customization fixing.