tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "useDefineForClassFields": true,
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "baseUrl": ".",
    "paths": {
      // The frontend keeps "@" mapped to /src.
      // The backend gets its own "@" mapping in server/tsconfig.json so both sides can use
      // the same alias name without sharing one compiler configuration.
      "@/*": ["src/*"]
    },
    "skipLibCheck": true,
    "moduleResolution": "Bundler",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx",
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "allowJs": true,
    // "checkJs": true, 
    "types": ["vite/client"],
    "ignoreDeprecations": "5.0"
  },
  "include": ["src", "shared", "vite.config.js"]
}