tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "noEmit": true,
    "esModuleInterop": true,
    "strict": true,
    "alwaysStrict": true,
    "strictNullChecks": true,
    "noUnusedLocals": false,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "useUnknownInCatchVariables": false,
    "moduleResolution": "Bundler",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "downlevelIteration": true,
    "allowSyntheticDefaultImports": true,
    "jsx": "preserve",
    "module": "ES2015",
    "declaration": true
  },
  "include": ["./packages/**/*"],
  "exclude": ["node_modules"]
}