chore: migrate eslint/prettier to biome (#16)

* chore: migrate eslint/prettier to biome

* chore: biome fix

* fix: react-compiler stable version, rename import in next config

* fix: a11y code component

* fix: wrong variable referenced in setTimeLeft

* chore: remove jsdoc annotation

Author: lorenzocorallo

.eslintrc.cjs

@@ -0,0 +1,86 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.3.10/schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "files": {
+    "ignoreUnknown": true,
+    "includes": [
+      "**",
+      "!node_modules",
+      "!.next",
+      "!dist",
+      "!build",
+      "!src/app/globals.css", // modified by shadcn
+      "!src/components/ui/*" // modified by shadcn
+    ]
+  },
+  "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": true,
+      "suspicious": {
+        "noVar": "error"
+        // "noUnknownAtRules": "off" // until fix for tailwind rules is released
+      },
+      "nursery": {
+        "noFloatingPromises": "error",
+        "noMisusedPromises": "error",
+        "noUnnecessaryConditions": "error",
+        "noImportCycles": "warn",
+        "useSortedClasses": {
+          "options": {
+            "attributes": ["classList"],
+            "functions": ["cn"]
+          }
+        }
+      },
+      "correctness": {
+        "useJsonImportAttributes": "warn",
+        "noPrivateImports": "error"
+      }
+    },
+    "domains": {
+      "project": "recommended",
+      "next": "recommended"
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "jsxQuoteStyle": "double",
+      "quoteProperties": "asNeeded",
+      "trailingCommas": "es5",
+      "semicolons": "asNeeded",
+      "arrowParentheses": "always",
+      "bracketSameLine": false,
+      "quoteStyle": "double",
+      "attributePosition": "auto",
+      "bracketSpacing": true
+    }
+  },
+  "html": { "formatter": { "selfCloseVoidElements": "always" } },
+  "css": {
+    "parser": {
+      "tailwindDirectives": true
+    }
+  },
+  "assist": {
+    "enabled": true,
+    "actions": { "source": { "organizeImports": "on" } }
+  }
+}

biome.jsonc

@@ -1,21 +1,19 @@
+import type { NextConfig } from "next"
 /**
  * Run `build` or `dev` with `SKIP_ENV_VALIDATION` to skip env validation. This is especially useful
  * for Docker builds.
  */
-import "./src/env.js";
+import "./src/env.ts"
 
-/** @type {import("next").NextConfig} */
-const config = {
-  eslint: {
-    ignoreDuringBuilds: true,
-  },
+const config: NextConfig = {
   typescript: {
     ignoreBuildErrors: true,
   },
   output: "standalone",
+  transpilePackages: ["@t3-oss/env-nextjs", "@t3-oss/env-core"],
   experimental: {
-    reactCompiler: true
-  }
-};
+    reactCompiler: true,
+  },
+}
 
-export default config;
+export default config

next.config.js next.config.tsnext.config.js renamed to next.config.ts

@@ -5,12 +5,9 @@
   "type": "module",
   "scripts": {
     "build": "next build",
-    "check": "next lint && tsc --noEmit",
     "dev": "PORT=3001 next dev --turbo",
-    "format:check": "prettier --check \"**/*.{ts,tsx,js,jsx,mdx}\" --cache",
-    "format:write": "prettier --write \"**/*.{ts,tsx,js,jsx,mdx}\" --cache",
-    "lint": "next lint",
-    "lint:fix": "next lint --fix",
+    "check": "biome check",
+    "check:fix": "biome check --fix --unsafe",
     "preview": "next build && next start",
     "start": "next start",
     "typecheck": "tsc --noEmit"
@@ -37,14 +34,14 @@
     "@trpc/next": "11.1.1",
     "@trpc/react-query": "11.1.1",
     "@trpc/tanstack-react-query": "11.1.1",
-    "babel-plugin-react-compiler": "19.1.0-rc.2",
+    "babel-plugin-react-compiler": "1.0.0",
     "better-auth": "^1.2.7",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",
     "geist": "^1.3.0",
     "lucide-react": "^0.525.0",
-    "next": "^15.4.8",
+    "next": "^15.5.9",
     "next-themes": "^0.4.4",
     "postgres": "^3.4.4",
     "react": "^18.3.1",
@@ -59,19 +56,13 @@
     "zod": "^3.23.3"
   },
   "devDependencies": {
+    "@biomejs/biome": "2.3.10",
     "@tailwindcss/postcss": "^4.1.4",
     "@trpc/server": "11.1.1",
-    "@types/eslint": "^8.56.10",
     "@types/node": "^20.14.10",
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
-    "@typescript-eslint/eslint-plugin": "^8.1.0",
-    "@typescript-eslint/parser": "^8.1.0",
-    "eslint": "^8.57.0",
-    "eslint-config-next": "^15.3.4",
     "postcss": "^8.4.39",
-    "prettier": "^3.3.2",
-    "prettier-plugin-tailwindcss": "^0.6.11",
     "tailwindcss": "^4.1.4",
     "typescript": "^5.5.3"
   },