text: /a/lib/tsc.js --w /a/app.ts
  //// [/a/app.ts]
  var x = 1;
  var y = 2;
  
  //// [/a/lib/lib.d.ts]
  /// <reference no-default-lib="true"/>
  interface Boolean {}
  interface Function {}
  interface CallableFunction {}
  interface NewableFunction {}
  interface IArguments {}
  interface Number { toExponential: any; }
  interface Object {}
  interface RegExp {}
  interface String { charAt: any; }
  interface Array<T> { length: number; [n: number]: T; }
  
  //// [/a/app.js]
  var x = 1;
  var y = 2;
  
  
  
  Output::
  >> Screen clear
  [[90m12:00:11 AM[0m] Starting compilation in watch mode...
  
  
  [[90m12:00:14 AM[0m] Found 0 errors. Watching for file changes.
  
  
  
  Program root files: ["/a/app.ts"]
  Program options: {"watch":true}
  Program files::
  /a/lib/lib.d.ts
  /a/app.ts
  
  Semantic diagnostics in builder refreshed for::
  /a/lib/lib.d.ts
  /a/app.ts
  
  WatchedFiles::
  /a/app.ts:
    {"fileName":"/a/app.ts","pollingInterval":250}
  /a/lib/lib.d.ts:
    {"fileName":"/a/lib/lib.d.ts","pollingInterval":250}
  
  FsWatches::
  
  FsWatchesRecursive::
  
  exitCode:: ExitStatus.undefined
  
  Change:: Append a line
  
  //// [/a/app.ts]
  var x = 1;
  var y = 2;
  var z = 3;
  
  //// [/a/app.js]
  var x = 1;
  var y = 2;
  var z = 3;
  
  
  
  Output::
  >> Screen clear
  [[90m12:00:17 AM[0m] File change detected. Starting incremental compilation...
  
  
  [[90m12:00:21 AM[0m] Found 0 errors. Watching for file changes.
  
  
  
  Program root files: ["/a/app.ts"]
  Program options: {"watch":true}
  Program files::
  /a/lib/lib.d.ts
  /a/app.ts
  
  Semantic diagnostics in builder refreshed for::
  /a/lib/lib.d.ts
  /a/app.ts
  
  WatchedFiles::
  /a/app.ts:
    {"fileName":"/a/app.ts","pollingInterval":250}
  /a/lib/lib.d.ts:
    {"fileName":"/a/lib/lib.d.ts","pollingInterval":250}
  
  FsWatches::
  
  FsWatchesRecursive::
  
  exitCode:: ExitStatus.undefined
  