$ composer create-project drupal/recommended-project:9.0.0 try9

$ php try9/web/core/scripts/drupal quick-start demo_umami

type: module
name: Token
description: Provides a user interface for the Token API...
core_version_requirement: ^8.8 || ^9

/**
 * Sets a message to display to the user.
 *
 * [...]
 *
 * @deprecated in drupal:8.5.0 and is removed from drupal:9.0.0.
 *   Use \Drupal\Core\Messenger\MessengerInterface::addMessage() instead.
 */
function drupal_set_message($message = NULL, $type = 'status', $repeat = FALSE) {
  @trigger_error('drupal_set_message() is deprecated in Drupal 8.5.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\Core\\Messenger\\MessengerInterface::addMessage() instead. See https://www.drupal.org/node/2774931', E_USER_DEPRECATED);  $messenger = \Drupal::messenger();
  if (isset($message)) {
    $messenger
      ->addMessage($message, $type, $repeat);
  }
  return $messenger
    ->all();
}

# drupalci.yml to add and run with Drupal 8.
build:
  assessment:
    validate_codebase:
      # Static analysis of code for @deprecated uses.
      phpstan:
        halt-on-fail: false

Version: 5.2 - Last updated June 25, 2020. The slides are free to use for everyone who wants to spread the word about Drupal 9 at meetups, camps or at your company. Why present in person instead of sending around a video? First of all, you will gain the best insights into Drupal 9 and show up as someone who has know-how to share. Second, you can turn this into a dialog at your meetup, company, conference, and make new connections. How to use the slides: - Review slides and speaker notes. - Make a copy for yourself on slides.com. - Adjust cover, personal intro slide and thanks slide. Keep attribution/ license. - Adjust slides/story to length. Translate if you want to. Do keep the whole story if you can. - Provide feedback to @gaborhojtsy. 💙 The slides will be updated regularly, so check back for updates before you present your copy of the slides again. Changelog: 4.0: First version on slides.com following previous Google Slides copy. Entirely reworked structure, more info. Enjoy! 4.1: Revised based on dan2k3k4's slides and updated release schedule; added Drupal 9's future section. 4.2: Added more resources, links to Drupal 10 plan issue. 4.3: Updated for semantic versioning being generally available and Drupal 9 beta2 being available. 4.4: Updated RC date, survey link and image, contrib readiness as of May 11 2020 4.5: Added new Drupal logo 4.6: Updated for RC1 4.7: Removed 8.7 support notes; updated contrib examples to Token and Webform; Updated semantic versioning notes; Removed deprecation burndown; Various smaller updates 4.8: Updated drupal_set_message() code example with current deprecation format. 4.9: Update post-release. Now mentions 9.0.0. Also fixed leftover CDN module example. 4.10: Update meeting time frequency 5.0: Deep updates for post-Drupal 9. Reviewed all the speaker notes and updated those too. Added Media and Layout Builder as stuff to finish. Updated Drupal 9 readiness numbers. Added Drupal 7.71 as an existing release. 5.1: Small fixes for speaker notes from Kristen Pol, thanks! 5.2: Updated for Drupal 7 security extension to November 28, 2022