npm install --global --production windows-build-tools

npm WARN deprecated fs-promise@2.0.3: Use mz or fs-extra^3.0 with Promise Support
npm WARN deprecated tar.gz@1.0.7: ⚠️  WARNING ⚠️ tar.gz module has been deprecated and your application is vulnerable. Please use tar module instead: https://npmjs.com/tar
> scrypt@6.0.3 preinstall [project path]node_modulesscrypt
> node node-scrypt-preinstall.js
> scrypt@6.0.3 install [project path]node_modulesscrypt
> node-gyp rebuild
[project path]node_modulesscrypt>if not defined npm_config_node_gyp (node "C:Program Filesnodejsnode_modulesnpmnode_modulesnpm-lifecyclenode-gyp-bin\....node_modulesnode-gypbinnode-gyp.js" rebuild )  else (node "C:Program Filesnodejsnode_modulesnpmnode_modulesnode-gypbinnode-gyp.js" rebuild )
Warning: Missing input files:
[project path]node_modulesscryptbuild..scryptwinincludeconfig.h
Building the projects in this solution one at a time. To enable parallel build, please add the "/m" switch.
  Copying scrypt/win/include/config.h to scrypt/scrypt-1.2.0/config.h
  The system cannot find the file specified.
  win_delay_load_hook.cc
LINK : fatal error LNK1181: cannot open input file '[user path].node-gyp9.8.0x64node.lib' [[project path]node_modulesscryptbuildcopied_files.vcxproj]
  memlimit.c
  keyderivation.c
  pickparams.c
  hash.c
  win_delay_load_hook.cc
  scrypt_wrapper.vcxproj -> [project path]node_modulesscryptbuildRelease\scrypt_wrapper.lib
gyp ERR! build error
gyp ERR! stack Error: `C:Program Files (x86)MSBuild14.0binmsbuild.exe` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onExit (C:Program Filesnodejsnode_modulesnpmnode_modulesnode-gyplibbuild.js:258:23)
gyp ERR! stack     at ChildProcess.emit (events.js:180:13)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:12)
gyp ERR! System Windows_NT 10.0.16299
gyp ERR! command "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\bin\node-gyp.js" "rebuild"
gyp ERR! cwd [project path]node_modulesscrypt
gyp ERR! node -v v9.8.0
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok
npm WARN inbox@1.0.0 No description
npm WARN inbox@1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modulesfsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! scrypt@6.0.3 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the scrypt@6.0.3 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     [user path]AppDataRoamingnpm-cache_logs2018-03-16T15_29_59_737Z-debug.log