chore: migrate backend to Node 24 ESM, Vitest, and Biome

.github/workflows/ci.yml

@@ -40,22 +40,9 @@ jobs:
       run: |
         npm audit --audit-level=high
 
-    - name: Check code formatting (Prettier)
+    - name: Run linter and formatter (Biome)
       run: |
-        npx prettier --check "src/**/*.ts"
-
-    - name: Cache ESLint
-      uses: actions/cache@v6
-      with:
-        path: .eslintcache
-        key: ${{ runner.os }}-eslint-${{ hashFiles('package-lock.json') }}-${{ github.sha }}
-        restore-keys: |
-          ${{ runner.os }}-eslint-${{ hashFiles('package-lock.json') }}-
-          ${{ runner.os }}-eslint-
-
-    - name: Run linter (ESLint)
-      run: |
-        npm run lint -- --cache --cache-location .eslintcache
+        npm run lint
 
     - name: Verify TypeScript types
       run: |

.lintstagedrc.json

@@ -1,11 +1,14 @@
 {
   "src/**/*.ts": [
-    "prettier --write",
-    "eslint --fix",
+    "biome check --write",
     "cspell"
   ],
-  "src/**/*.{js,json,md}": [
-    "prettier --write",
+  "src/**/*.{js,json}": [
+    "biome check --write",
+    "cspell"
+  ],
+  "src/**/*.md": [
+    "biome format --write",
     "cspell"
   ]
 }

biome.json

@@ -0,0 +1,44 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.5.7/schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "files": {
+    "includes": [
+      "**",
+      "!dist",
+      "!coverage",
+      "!.stryker-tmp",
+      "!node_modules"
+    ]
+  },
+  "formatter": {
+    "enabled": true,
+    "formatWithErrors": false,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 80
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "preset": "recommended",
+      "suspicious": {
+        "noExplicitAny": "error"
+      },
+      "correctness": {
+        "noUnusedVariables": "warn"
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "double",
+      "trailingCommas": "all",
+      "semicolons": "always",
+      "arrowParentheses": "always"
+    }
+  }
+}

build.ts

@@ -14,7 +14,7 @@ import logger from "jet-logger";
     // Remove current build
     await remove("./dist/");
     // Copy back-end files
-    await exec("tsc --build tsconfig.prod.json", "./");
+    await exec("tsc --build tsconfig.prod.json && npx tsc-alias -p tsconfig.prod.json", "./");
   } catch (err) {
     logger.err(err);
     process.exit(1);

cspell.json

@@ -15,6 +15,9 @@
     "stryker",
     "eslint",
     "prettier",
+    "biome",
+    "vitest",
+    "taze",
     "commitlint",
     "lintstaged",
     "dockerode",