tsconfig.dev.json

{
  "compilerOptions": {
   "target": "ES6",
    "lib": ["esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": false,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "outDir": "./tmp"
  },
  "include": [
    "src"
  ],
  "watchOptions": {
    // Use native file system events for files and directories
    "watchFile": "useFsEvents",
    "watchDirectory": "useFsEvents",
    // Poll files for updates more frequently
    // when they're updated a lot.
    "fallbackPolling": "dynamicPriority",
    // Don't coalesce watch notification
    "synchronousWatchDirectory": true,
    // Finally, two additional settings for reducing the amount of possible
    // files to track  work from these directories
    "excludeDirectories": ["**/node_modules", "dist"],
    "excludeFiles": ["build/fileWhichChangesOfent.ts"]
  }
}