title: ExperimentalWarning: The fs.promises API is experimental
body: <p>I am new to node and npm and trying to understand AutoRest.</p>
  
  <p>When I type </p>
  
  <pre><code>autorest --list-available
  </code></pre>
  
  <p>into powershell ISE
  I get</p>
  
  <pre><code>AutoRest code generation utility [version: 2.0.4262; node: v10.1.0]
  (C) 2018 Microsoft Corporation.
  https://aka.ms/autorest
  autorest : (node:12580) ExperimentalWarning: The fs.promises API is experimental
  At line:1 char:1
  + autorest --list-available
  + ~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : NotSpecified: ((node:12580) Ex...is experimental:String) [], RemoteExc 
     eption
      + FullyQualifiedErrorId : NativeCommandError
  
   Extension Name                 Version       
  
   @microsoft.azure/autorest-core 2.0.4278       
   @microsoft.azure/autorest-core 2.0.4277       
   @microsoft.azure/autorest-core 2.0.4276       
   @microsoft.azure/autorest-core 2.0.4275       
   @microsoft.azure/autorest-core 2.0.4274       
   @microsoft.azure/autorest-core 2.0.4272       
   @microsoft.azure/autorest-core 2.0.4271       
   @microsoft.azure/autorest-core 2.0.4269       
   @microsoft.azure/autorest-core 2.0.4263       
   @microsoft.azure/autorest-core 2.0.4262       
  Failure:
  TypeError: volume[member].bind is not a function
  TypeError: volume[member].bind is not a function
      at patchFilesystem 
  (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\static-loader.js:277:43)
      at C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\static-loader.js:281:18
      at Object.global.staticloader.undo 
  (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\static-loader.js:163:7)
      at process.exit.n [as exit] 
  (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\static-loader.js:170:27)
      at main (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\app.js:153:21)
      at process._tickCallback (internal/process/next_tick.js:68:7)
  (node:12580) UnhandledPromiseRejectionWarning: Error: EBADF: bad file descriptor, close
      at Object.fs.closeSync (fs.js:529:3)
      at StaticVolumeFile.shutdown 
  (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\static-loader.js:352:10)
      at StaticFilesystem.shutdown 
  (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\static-loader.js:406:17)
      at process.exit.n [as exit] 
  (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\static-loader.js:169:11)
      at main (C:\Users\kirst\AppData\Roaming\npm\node_modules\autorest\dist\app.js:239:17)
      at process._tickCallback (internal/process/next_tick.js:68:7)
  (node:12580) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated 
  either by throwing inside of an async function without a catch block, or by rejecting a promise 
  which was not handled with .catch(). (rejection id: 1)
  (node:12580) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the 
  future, promise rejections that are not handled will terminate the Node.js process with a non-zero 
  </code></pre>
  
  <p>what is happening?
      exit code.</p>