Specify what approach the watcher should use if the system runs out of native file watchers. See more: https://www.typescriptlang.org/tsconfig#fallbackPolling
Set the JavaScript language version for emitted JavaScript and include compatible library declarations. See more: https://www.typescriptlang.org/tsconfig#target
Specify how directories are watched on systems that lack recursive file-watching functionality. See more: https://www.typescriptlang.org/tsconfig#watchDirectory