build: add biome.js for code formatting and linting

Author: zhensherlock

biome.json

@@ -0,0 +1,52 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.3.7/schema.json",
+  "vcs": { "enabled": true, "clientKind": "git", "useIgnoreFile": true },
+  "files": { "ignoreUnknown": false },
+  "formatter": {
+    "enabled": true,
+    "formatWithErrors": false,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineEnding": "lf",
+    "lineWidth": 120,
+    "attributePosition": "auto",
+    "bracketSameLine": false,
+    "bracketSpacing": true,
+    "expand": "auto",
+    "useEditorconfig": true
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": false,
+      "correctness": { "noUnusedVariables": "warn" },
+      "suspicious": { "noConsole": "off", "noExplicitAny": "off" }
+    },
+    "includes": ["**", "!**/build", "!**/node_modules", "!**/.*", "!**/*.d.ts", "!.husky/"]
+  },
+  "javascript": {
+    "formatter": {
+      "jsxQuoteStyle": "double",
+      "quoteProperties": "asNeeded",
+      "trailingCommas": "all",
+      "semicolons": "asNeeded",
+      "arrowParentheses": "asNeeded",
+      "bracketSameLine": false,
+      "quoteStyle": "single",
+      "attributePosition": "auto",
+      "bracketSpacing": true
+    },
+    "globals": ["exports"]
+  },
+  "html": {
+    "formatter": {
+      "indentScriptAndStyle": false,
+      "selfCloseVoidElements": "always"
+    }
+  },
+  "overrides": [{ "includes": ["src/**/*.{js,ts}", "tests/**/*.{js,ts}"] }],
+  "assist": {
+    "enabled": true,
+    "actions": { "source": { "organizeImports": "on" } }
+  }
+}

package.json

@@ -25,6 +25,7 @@
     "dotenv": "^17.2.3"
   },
   "devDependencies": {
+    "@biomejs/biome": "2.3.7",
     "@commitlint/cli": "^20.1.0",
     "@commitlint/config-conventional": "^20.0.0",
     "@typescript-eslint/eslint-plugin": "^8.48.0",