TypeError: DirectoryWatcher is not a constructor

[msogrin]

We have a repeating error appearing when running tests of our application (using jest, if it matters; using the project set up via https://github.com/react-boilerplate/react-boilerplate). Is this error caused by our (or react-boilerplate) misconfiguration somewhere, or it is a problem in watchpack itself?

/app/node_modules/watchpack/lib/watcherManager.js:18
                this.directoryWatchers[key] = new DirectoryWatcher(directory, options);
                                              ^

TypeError: DirectoryWatcher is not a constructor
    at WatcherManager.Object.<anonymous>.WatcherManager.getDirectoryWatcher (/app/node_modules/watchpack/lib/watcherManager.js:18:33)
    at WatcherManager.watchFile (/app/node_modules/watchpack/lib/watcherManager.js:28:14)
    at Watchpack.<anonymous> (/app/node_modules/watchpack/lib/watchpack.js:38:49)
    at Array.map (<anonymous>)
    at Watchpack.watch (/app/node_modules/watchpack/lib/watchpack.js:37:28)
    at NodeWatchFileSystem.watch (/app/node_modules/webpack/lib/node/NodeWatchFileSystem.js:70:16)
    at Watching.watch (/app/node_modules/webpack/lib/Watching.js:113:48)
    at compiler.hooks.done.callAsync (/app/node_modules/webpack/lib/Watching.js:100:10)
    at AsyncSeriesHook.eval [as callAsync] (eval at create (/app/node_modules/webpack/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:15:1)
    at AsyncSeriesHook.lazyCompileHook (/app/node_modules/webpack/node_modules/tapable/lib/Hook.js:154:20)
    at Watching._done (/app/node_modules/webpack/lib/Watching.js:97:28)
    at compiler.emitRecords.err (/app/node_modules/webpack/lib/Watching.js:72:19)
    at Compiler.emitRecords (/app/node_modules/webpack/lib/Compiler.js:449:39)
    at compiler.emitAssets.err (/app/node_modules/webpack/lib/Watching.js:53:20)
    at hooks.afterEmit.callAsync.err (/app/node_modules/webpack/lib/Compiler.js:435:14)
    at AsyncSeriesHook.eval [as callAsync] (eval at create (/app/node_modules/webpack/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:15:1)
    at AsyncSeriesHook.lazyCompileHook (/app/node_modules/webpack/node_modules/tapable/lib/Hook.js:154:20)
    at asyncLib.forEachLimit.err (/app/node_modules/webpack/lib/Compiler.js:432:27)
    at /app/node_modules/neo-async/async.js:2813:7
    at done (/app/node_modules/neo-async/async.js:3521:9)
    at MemoryFileSystem.Object.<anonymous>.MemoryFileSystem.writeFile (/app/node_modules/webpack-dev-middleware/node_modules/memory-fs/lib/MemoryFileSystem.js:328:9)
    at writeOut (/app/node_modules/webpack/lib/Compiler.js:415:30)
    at asyncLib.forEachLimit (/app/node_modules/webpack/lib/Compiler.js:426:7)
    at objectIteratorWithKey (/app/node_modules/neo-async/async.js:3508:9)
    at timesSync (/app/node_modules/neo-async/async.js:2292:7)
    at Object.eachLimit (/app/node_modules/neo-async/async.js:3463:5)
    at emitFiles (/app/node_modules/webpack/lib/Compiler.js:321:13)
    at Immediate._onImmediate (/app/node_modules/webpack-dev-middleware/node_modules/memory-fs/lib/MemoryFileSystem.js:288:4)
    at runCallback (timers.js:810:20)
    at tryOnImmediate (timers.js:768:5)
    at processImmediate [as _immediateCallback] (timers.js:745:5)

[angelyaaaaa]

I got same situation when I doing endpoint test through jest, but I got other error as detail :
setInterval(...).unref is not a function

then I found this: TypeError: timer.unref is not a function which solves my problems.

hope it helps

[toearth]

+1

TypeError: DirectoryWatcher is not a constructor

  at WatcherManager.Object.<anonymous>.WatcherManager.getDirectoryWatcher (node_modules/watchpack/lib/watcherManager.js:18:33)
  at WatcherManager.watchFile (node_modules/watchpack/lib/watcherManager.js:28:14)
  at Watchpack.<anonymous> (node_modules/watchpack/lib/watchpack.js:38:49)
      at Array.map (<anonymous>)
  at Watchpack.watch (node_modules/watchpack/lib/watchpack.js:37:28)
  at NodeWatchFileSystem.watch (node_modules/webpack/lib/node/NodeWatchFileSystem.js:70:16)
  at Watching.watch (node_modules/webpack/lib/Watching.js:114:48)
  at compiler.hooks.done.callAsync (node_modules/webpack/lib/Watching.js:101:10)
  at AsyncSeriesHook.eval [as callAsync] (eval at create (node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:87:1)
  at AsyncSeriesHook.lazyCompileHook (node_modules/tapable/lib/Hook.js:154:20)
  at Watching._done (node_modules/webpack/lib/Watching.js:98:28)
  at compiler.emitRecords.err (node_modules/webpack/lib/Watching.js:73:19)
  at Compiler.emitRecords (node_modules/webpack/lib/Compiler.js:499:39)
  at compiler.emitAssets.err (node_modules/webpack/lib/Watching.js:54:20)
  at hooks.afterEmit.callAsync.err (node_modules/webpack/lib/Compiler.js:485:14)
  at AsyncSeriesHook.eval [as callAsync] (eval at create (node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:20:1)

`

[Ghirigoro]

Same error here while using Jest and koa-webpack.

[alexander-akait]

I think we can close it, DirectoryWatcher is not a constructor when you doesn't close webpack-dev-middleware and still try to use it (you can see it in stack trace)