eslint: no-explicit-any -> error; +husky pre-commit (lint only); config cleanups

.husky/pre-commit

@@ -0,0 +1 @@
+pnpm exec lint-staged

eslint.config.js

@@ -63,21 +63,21 @@ export default tseslint.config(
         "warn",
         { allowConstantExport: true },
       ],
-      // All of these overrides ease getting into
-      // TypeScript, and can be removed for stricter
-      // linting down the line.
+      // Several rules below are relaxed to ease getting into
+      // TypeScript, and can be tightened for stricter linting
+      // down the line.
 
       // Only warn on unused variables, and ignore variables starting with `_`
       "@typescript-eslint/no-unused-vars": [
         "warn",
         { varsIgnorePattern: "^_", argsIgnorePattern: "^_" },
       ],
 
-      // Allow escaping the compiler
+      // Disallow escaping the compiler (@ts-ignore / @ts-nocheck etc.)
       "@typescript-eslint/ban-ts-comment": "error",
 
-      // Allow explicit `any`s
-      "@typescript-eslint/no-explicit-any": "off",
+      // Disallow explicit `any` — prefer `unknown` or a precise type
+      "@typescript-eslint/no-explicit-any": "error",
 
       // START: Allow implicit `any`s
       "@typescript-eslint/no-unsafe-argument": "off",

lint-staged.config.js

@@ -0,0 +1,16 @@
+// Lint only — never a formatter (auto-formatting churns untouched lines).
+// Returning an array runs each command verbatim, without the staged filenames
+// appended: `tsc -b` type-checks the whole project (build mode rejects file
+// args), while eslint lints only staged files. `--no-warn-ignored` skips
+// eslint-ignored files instead of failing. Each filename is quoted, and `--`
+// ends eslint option parsing, so names with spaces or a leading `-` survive.
+// https://github.com/lint-staged/lint-staged#example-run-tsc-on-changes-to-typescript-files-but-do-not-pass-any-filename-arguments
+export default {
+  "*.{ts,tsx}": (stagedFiles) => {
+    const files = stagedFiles.map((file) => JSON.stringify(file)).join(" ");
+    return [
+      `eslint --max-warnings 0 --no-warn-ignored -- ${files}`,
+      "tsc -b",
+    ];
+  },
+};

package.json

@@ -5,15 +5,16 @@
   "type": "module",
   "scripts": {
     "init": "pnpm install && ([ -f .env.local ] || cp .env.example .env.local) && convex login && convex dev --once && claude ${RUNNING_IN_CONTAINER:+--dangerously-skip-permissions} '/init-app'",
-    "dev": "npm-run-all --parallel dev:frontend dev:backend",
+    "dev": "run-p dev:frontend dev:backend",
     "dev:frontend": "vite --open",
     "dev:backend": "convex dev",
     "build": "tsc -b && vite build",
-    "lint": "tsc -b && eslint .  --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "lint": "tsc -b && eslint . --report-unused-disable-directives --max-warnings 0",
     "test": "vitest run",
     "test:watch": "vitest",
     "format": "prettier --write .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "prepare": "husky"
   },
   "dependencies": {
     "@clerk/clerk-react": "^5.61.3",
@@ -53,7 +54,9 @@
     "eslint-plugin-react-hooks": "^7.1.1",
     "eslint-plugin-react-refresh": "^0.5.2",
     "globals": "^17.6.0",
-    "npm-run-all": "^4.1.5",
+    "husky": "^9.1.7",
+    "lint-staged": "16.4.0",
+    "npm-run-all2": "8.0.4",
     "prettier": "^3.8.3",
     "tailwindcss": "^4.3.0",
     "typescript": "~5.9.3",