How to upgrade from Drupal 8 to 9 with composer [blog post + screen cast]

This blogposts gives you a summary on how to upgrade to drupal 9 and fix all composer issues.

How to patch htaccess file in composer.json - drupal 8

A composer update of your drupal can override changes to your htaccess file. With this snippet you can patch it correctly.

How to add a javascript library to composer.json in drupal 8

It is seen as a bad practice to add complete libraries to your theme in drupal 8. You should add these as packages to your composer file.

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