tsconfig.json

{
  "compilerOptions": {
    "lib": ["dom", "dom.iterable", "esnext"],
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "removeComments": true,
    "preserveConstEnums": true,
    "strict": true,
    "alwaysStrict": true,
    "strictNullChecks": true,
    "noUncheckedIndexedAccess": true,

    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "allowUnreachableCode": false,
    "noFallthroughCasesInSwitch": true,
    "downlevelIteration": true,

    "target": "es2021",
    "outDir": "out",
    "declaration": true,
    "sourceMap": true,

    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "allowJs": false, // earlier - true
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,

    "jsx": "preserve",
    "noEmit": true,
    "isolatedModules": true,
    "incremental": true,

    "baseUrl": ".",
    "paths": {
      "@/*": ["./src/*"],
      "@/public/*": ["./public/*"]
    }
  },
  "exclude": ["./out/**/*", "./node_modules/**/*", "./utils/functions.ts"],
  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"]
}