tsconfig.json

{
  "compilerOptions": {
    // Enable latest features
    "lib": ["ESNext", "DOM", "DOM.Iterable"],
    "target": "ESNext",
    "module": "ESNext",
    "moduleDetection": "force",
    "resolveJsonModule": true,
    "isolatedModules": true,
    // Bundler mode
    "moduleResolution": "Bundler",
    "verbatimModuleSyntax": true,
    // Best practices
    "strict": true,
    "skipLibCheck": true,
    "noFallthroughCasesInSwitch": true,
    // Some stricter flags
    "noUnusedLocals": false,
    "noImplicitAny": true,
    "noImplicitOverride": true,
    "noImplicitThis": true,
    "noUnusedParameters": false,
    "noPropertyAccessFromIndexSignature": false,
    // Declaration options
    "declaration": true,
    "declarationDir": "lib",
    "stripInternal": true,
    "isolatedDeclarations": true
  }
}