tsconfig.json

{
  "compilerOptions": {
    "lib": ["DOM", "DOM.Iterable", "ESNext"],
    "target": "ES2017",
    "module": "Preserve",
    // ^ also implies:
    // "moduleResolution": "bundler",
    // "esModuleInterop": true,
    // "resolveJsonModule": true,

    "allowJs": true,
    "checkJs": true,

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

    "allowImportingTsExtensions": true,
    "verbatimModuleSyntax": true,

    "strict": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noUncheckedIndexedAccess": true,
    "noFallthroughCasesInSwitch": true,
    "allowUnusedLabels": false,
    "allowUnreachableCode": false,

    "plugins": [{ "name": "next" }]
  },
  "include": [
    ".next/types/**/*.ts",
    "next-env.d.ts",
    "**/*.ts",
    "**/*.tsx",
    "**/*.js"
  ],
  "exclude": ["node_modules"]
}