tsconfig.json

{
  "compilerOptions": {
    "incremental": true,
    "target": "es5",
    "lib": ["es6", "es2017", "dom"],
    "allowJs": true,
    "declaration": false,
    "downlevelIteration": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "isolatedModules": true,
    "jsx": "react-jsx",
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "skipLibCheck": true,
    "sourceMap": true,
    "strictNullChecks": true,
    "rootDir": "./",
    "outDir": "dist"
  },
  "exclude": ["node_modules", "dist"],
  "watchOptions": {
    "watchFile": "useFsEvents",
    "watchDirectory": "useFsEvents",
    "fallbackPolling": "dynamicPriority",
    "synchronousWatchDirectory": true
  }
}