CHORE,REFA: introduced linter

README.md

@@ -45,3 +45,5 @@ you have been warned.
 ```sh
 sh join_js_files.sh
 ```
+https://eslint.org/docs/latest/use/getting-started
+

eslint.config.mjs

@@ -0,0 +1,15 @@
+import js from "@eslint/js";
+import globals from "globals";
+import json from "@eslint/json";
+import css from "@eslint/css";
+import { defineConfig } from "eslint/config";
+
+
+export default defineConfig([
+  { files: ["**/*.{js,mjs,cjs}"], plugins: { js }, extends: ["js/recommended"] },
+  { files: ["**/*.js"], languageOptions: { sourceType: "script" } },
+  { files: ["**/*.{js,mjs,cjs}"], languageOptions: { globals: globals.browser } },
+  { files: ["**/*.json"], plugins: { json }, language: "json/json", extends: ["json/recommended"] },
+  { files: ["**/*.jsonc"], plugins: { json }, language: "json/jsonc", extends: ["json/recommended"] },
+  { files: ["**/*.css"], plugins: { css }, language: "css/css", extends: ["css/recommended"] },
+]);

package.json

@@ -20,5 +20,12 @@
   "license": "SEE LICENCE.md",
   "dependencies": {
     "jpclw-extension": "git+https://git.labos.goip.de/chris/jpclw-extension.git"
+  },
+  "devDependencies": {
+    "@eslint/css": "^0.7.0",
+    "@eslint/js": "^9.26.0",
+    "@eslint/json": "^0.12.0",
+    "eslint": "^9.26.0",
+    "globals": "^16.1.0"
   }
 }