Add make upgrade steps + upgrade eslint

Makefile

@@ -171,4 +171,31 @@ serve: install
 	$(YARN) run start
 
 
-#
+upgrade:\
+	.git/hooks/commit-msg\
+	upgrade-remove-husky\
+	upgrade-eslint
+	@# Upgrade target, depends on other upgrades
+
+
+upgrade-remove-husky:
+	test -d .husky\
+		&& rm -R .husky\
+		&& git add .husky\
+		&& git commit -m"maint: @patternslib/dev upgrade - remove .husky directory in favor of git hooks."\
+		|| :
+	-git config --unset core.hooksPath
+
+
+eslint.config.js upgrade-eslint:
+	test -f "eslint.config.js"\
+		|| (\
+			echo 'module.exports = require("@patternslib/dev/eslint.config.js");' > eslint.config.js\
+			&& git add eslint.config.js\
+			&& git commit -m"maint: @patternslib/dev upgrade - create eslint.config.js."\
+		)
+	test -f ".eslintrc.js"\
+		&& rm .eslintrc.js\
+		&& git add .eslintrc.js\
+		&& git commit -m"maint: @patternslib/dev upgrade - remove old .eslintrc.js."\
+		|| :

README.md

@@ -1,7 +1,17 @@
 # Development helpers and config for Patternslib and add-ons.
 
+This repository includes base files which are extended in Patternslib, Mockup or other projects.
+
+It includes a Makefile which helps in installing and releasing packages.
+
+## Upgrading
+
+Run `make upgrade` in your project.
+
+Alternatively, if there is a new `@patternslib/dev` version installed, the `postinstall` package.json script will automatically run `make upgrade` in the directory where package installer was invoked, that is your project directory which depends on `@patternslib/dev`.
+
+
 ## Code style
 
-The release process based on release-it includes automatic changelog generation via conventional-commit, commitlint and a pre-commit hook by husky.
+The release process based on release-it includes automatic changelog generation via conventional-commit, commitlint and a git pre-commit hook.
 Please check the [code style guide](https://github.com/Patternslib/Patterns/blob/master/docs/developer/styleguide.md#commits-messages) for the commit specification!
-

eslint.config.js

@@ -0,0 +1,37 @@
+const js = require("@eslint/js");
+const config_prettier = require("eslint-config-prettier");
+const globals = require("globals");
+const babel_parser = require("@babel/eslint-parser");
+
+module.exports = [
+    js.configs.recommended,
+    config_prettier,
+    {
+        languageOptions: {
+            ecmaVersion: 2022,
+            globals: {
+                ...globals.browser,
+                ...globals.node,
+                ...globals.jest,
+            },
+            parser: babel_parser,
+        },
+        ignores: [
+            "cache/",
+            "coverage/",
+            "dist/",
+            "node_modules/",
+            "stats.json",
+            "style/",
+        ],
+        rules: {
+            "no-debugger": 1,
+            "no-duplicate-imports": 1,
+            // Do keep due avoid unintendet consequences.
+            "no-alert": 0,
+            "no-control-regex": 0,
+            "no-self-assign": 0,
+            "no-useless-escape": 0,
+        },
+    }
+];

package.json

@@ -12,8 +12,9 @@
         "@release-it/conventional-changelog": "^10.0.0",
         "babel-loader": "^9.2.1",
         "css-loader": "^7.1.2",
-        "eslint": "^8.57.0",
-        "eslint-config-prettier": "^9.1.0",
+        "eslint": "^9.20.1",
+        "eslint-config-prettier": "^10.0.1",
+        "globals": "^15.15.0",
         "identity-obj-proxy": "^3.0.0",
         "jest": "^29.7.0",
         "jest-environment-jsdom": "^29.7.0",
@@ -37,6 +38,7 @@
         "node": ">=18.18"
     },
     "scripts": {
+        "postinstall": "cd $INIT_CWD && make upgrade",
         "test": "jest"
     },
     "author": {