tsconfig.json

{
  "compilerOptions": {
    "isolatedModules": true,
    "moduleResolution": "node",
    "noImplicitAny": false,
    "noEmitOnError": true,
    "removeComments": false,
    "sourceMap": true,
    "target": "es6",
    "outDir": "dist",
    "allowSyntheticDefaultImports": true
  },
  "include": [
      "src/**/*.ts"
  ],
  "lib": [
      "es2015"
  ],
    // NEW: Options for file/directory watching
    "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", "_build"],
      "excludeFiles": ["build/fileWhichChangesOften.ts"]
    }
}