build: Drop ESLint, use Biome for linting (#1170)

* build: Migrated from ESLint to Biomejs for linting
* build: Added VScode settings/plugin recommendations

.gitignore

@@ -1,6 +1,5 @@
 ## editors
 /.idea
-/.vscode
 
 ## system files
 .DS_Store

.vscode/extensions.json

@@ -0,0 +1,14 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+  // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+  // List of extensions which should be recommended for users of this workspace.
+  "recommendations": [
+    "biomejs.biome",
+    "editorconfig.editorconfig",
+    "esbenp.prettier-vscode",
+    "runem.lit-plugin",
+    "streetsidesoftware.code-spell-checker"
+  ],
+  // List of extensions recommended by VS Code that should not be recommended for users of this workspace.
+  "unwantedRecommendations": []
+}

.vscode/settings.json

@@ -0,0 +1,4 @@
+{
+  "lit-plugin.strict": true,
+  "typescript.tsdk": "node_modules/typescript/lib"
+}

biome.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.7.0/schema.json",
+  "files": {
+    "include": [
+      "src/**/*.ts",
+      "src/**/*.js",
+      "scripts/*.js",
+      "scripts/*.mjs",
+      "stories/*.ts"
+    ],
+    "ignore": ["dist/**/*"]
+  },
+  "vcs": {
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "organizeImports": {
+    "enabled": true
+  },
+  "formatter": {
+    "enabled": false
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "complexity": {
+        "noForEach": "off",
+        "noStaticOnlyClass": "off"
+      },
+      "style": {
+        "noNamespace": "error",
+        "useCollapsedElseIf": "error",
+        "noNonNullAssertion": "off"
+      },
+      "suspicious": {
+        "noExplicitAny": "off"
+      }
+    }
+  }
+}