Add D9 deprecations configuration.

Author: matthijs-va

README.md

@@ -34,5 +34,38 @@ For an extension:
 }
 ```
 
+For an extension (to check only for D9 deprecations):
+
+```json
+"grumphp": {
+    "config-default-path": "vendor/digipolisgent/qa-drupal/configs/grumphp-extension-d9.yml"
+}
+```
+
 Now install this package and its requirements by executing execute following command:
 <pre><code>composer require --dev digipolisgent/qa-drupal:^1.0</code></pre>
+
+
+# Configuration
+
+**This section only applies to the site and extension configuration of GrumPHP.**
+
+You can optionally extend or override the task configuration files by creating
+them in your project root. For example: create a `phpcs.xml` or `phpcs.local.xml`
+file to override the configuration provided by this package.
+
+Note that Yaml and Neon files will be merged with your local files. So if you create
+a `phpstan.neon` file it will be merged with the `phpstan.neon` file of this package.
+
+To prevent this, create a `.env` or `.env.local` file and add following contents:
+```
+PHPSTAN_SKIP_PACKAGE_GLOBAL=1
+```
+
+The skip variable name is always the same `[FILENAME]_SKIP_[TYPE]`, wherin `[FILENAME]`
+if the file name and `[TYPE]` is either:
+
+- `LOCAL` to skip `phpstan.local.neon`.
+- `PROJECT` to skip `phpstan.neon`.
+- `PACKAGE_TYPE` to skip `phpstan-extension.neon` (if in an extension) of this package.
+- `PACKAGE_GLOBAL` to skip `phpstan.neon` of this package.

configs/grumphp-extension-d9.yml

@@ -0,0 +1,16 @@
+parameters:
+  hooks_dir: ~
+  hooks_preset: local
+  stop_on_failure: true
+  hide_circumvention_tip: true
+  ascii: ~
+  tasks:
+    phpstan:
+      configuration: vendor/digipolisgent/qa-drupal/configs/phpstan-extension-d9.neon
+      triggered_by:
+        - php
+        - inc
+        - install
+        - module
+        - theme
+        - profile

configs/phpstan-extension-d9.neon

@@ -0,0 +1,14 @@
+includes:
+  - vendor/mglaman/phpstan-drupal/extension.neon
+  - vendor/phpstan/phpstan-deprecation-rules/rules.neon
+
+parameters:
+  tipsOfTheDay: false
+  customRulesetUsed: true
+  reportUnmatchedIgnoredErrors: false
+  ignoreErrors:
+    - '#^(?:(?!deprecated).)*$#'
+  excludes_analyse:
+    - 'tests/*'
+  drupal:
+    drupal_root: ../drupal

configs/phpstan.neon

@@ -6,7 +6,7 @@ parameters:
   tipsOfTheDay: false
   reportUnmatchedIgnoredErrors: false
   ignoreErrors:
-    - "#Unsafe usage of new static\\(\\)#"
-    - "#\\Drupal calls should be avoided in classes#"
+    - '#Unsafe usage of new static\(\)#'
+    - '#\Drupal calls should be avoided in classes#'
   excludes_analyse:
-    - "*/node_modules/*"
+    - '*/node_modules/*'