fix!: support Lit 3.0

frontend/.eslintrc

@@ -1,30 +1,25 @@
 {
-  "extends": ["vaadin"],
-  "plugins": ["chai-friendly"],
+  "extends": [
+    "vaadin/typescript-requiring-type-checking",
+    "vaadin/imports-typescript",
+    "vaadin/testing",
+    "vaadin/prettier"
+  ],
+  "ignorePatterns": ["packages/ts/*/test/**/*.snap.ts"],
+  "plugins": ["mocha", "tsdoc"],
   "rules": {
-    "@typescript-eslint/ban-ts-comment": "off",
-    "@typescript-eslint/no-non-null-assertion": "off",
-    // https://github.com/import-js/eslint-plugin-import/issues/2170#issuecomment-889657579
-    "import/no-unresolved": "off",
+    "@typescript-eslint/class-methods-use-this": "off",
+    "@typescript-eslint/no-invalid-void-type": "off",
+    "@typescript-eslint/no-unsafe-member-access": "off",
+    "@typescript-eslint/member-ordering": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/return-await": "off",
+    "class-methods-use-this": "off",
+    "import/no-duplicates": "off",
+    "import/prefer-default-export": "off",
+    "max-params": "off",
     "max-classes-per-file": "off",
-    "no-plusplus": ["error", { "allowForLoopAfterthoughts": true }],
-    "no-restricted-syntax": [
-      "error",
-      {
-        "selector": "ForInStatement",
-        "message": "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array."
-      },
-      {
-        "selector": "LabeledStatement",
-        "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
-      },
-      {
-        "selector": "WithStatement",
-        "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."
-      }
-    ],
-
-    "no-unused-expressions": "off",
-    "chai-friendly/no-unused-expressions": "error"
+    "mocha/no-exclusive-tests": "error",
+    "tsdoc/syntax": "error"
   }
 }

frontend/lerna.json

@@ -1,6 +1,5 @@
 {
   "packages": ["packages/*"],
   "npmClient": "npm",
-  "useWorkspaces": true,
   "version": "0.0.18"
 }