npm install fails with error c2373 with vs2015 update 3

[d3x0r]

Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
  bufferutil.cc
  win_delay_load_hook.c
C:\Users\<User>\AppData\Roaming\npm\node_modules\npm\node_modules\node-gyp\src\win_delay_load_hook.c(34): error C2373: '__pfnDliNotifyHook2': redefinition; different type modifiers [M:\javascript\server\node_modules\websocket\build\bufferutil.vcxproj]
  C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\delayimp.h(134): note: see declaration of '__pfnDliNotifyHook2'
  validation.cc
  win_delay_load_hook.c
C:\Users\<User>\AppData\Roaming\npm\node_modules\npm\node_modules\node-gyp\src\win_delay_load_hook.c(34): error C2373: '__pfnDliNotifyHook2': redefinition; different type modifiers [M:\javascript\server\node_modules\websocket\build\validation.vcxproj]
  C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\delayimp.h(134): note: see declaration of '__pfnDliNotifyHook2'

workaround - define this.
DELAYIMP_INSECURE_WRITABLE_HOOKS

https://stackoverflow.com/questions/38149603/npm-install-fails-with-error-c2373-with-vs2015-update-3

[iongion]

This is still occurring, I have the same but for VS14.0:

Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
  bufferutil.cc
  win_delay_load_hook.c
C:\Users\user\AppData\Roaming\npm\node_modules\npm\node_modules\node-gyp\src\win_delay_load_hook.c(34): error C2373: '__pfnDliNotifyHook2': redefinition; different type modifiers [W:\Workspace\producer\keedaemon\monitoring\node_modules\websocket\build\bufferutil.vcxproj]
  C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\delayimp.h(134): note: see declaration of '__pfnDliNotifyHook2'
  validation.cc
  win_delay_load_hook.c
C:\Users\user\AppData\Roaming\npm\node_modules\npm\node_modules\node-gyp\src\win_delay_load_hook.c(34): error C2373: '__pfnDliNotifyHook2': redefinition; different type modifiers [W:\Workspace\producer\keedaemon\monitoring\node_modules\websocket\build\validation.vcxproj]
  C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\delayimp.h(134): note: see declaration of '__pfnDliNotifyHook2'
monitoring@1.0.2 W:\Workspace\producer\keedaemon\monitoring

[d3x0r]

This fixed it for me...
npm -g install npm@next

(from the end of ) nodejs/node-gyp#972

can add this in binding.gyp

•  'defines' : ['DELAYIMP_INSECURE_WRITABLE_HOOKS'],
  

[d3x0r]

I thought I had closed this when I found the solution... sorry