C:\xampp\htdocs\CN-pool\node_bignum>if not defined npm_config_node_gyp (node "C:
\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin\\
..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild )  else (node "C:\Program F
iles\nodejs\node_modules\npm\node_modules\node-gyp\bin\node-gyp.js" rebuild )
gyp ERR! UNCAUGHT EXCEPTION
gyp ERR! stack Error: spawn C:\Program Files (x86)\Microsoft Visual Studio\2019\
Community\MSBuild\15.0\Bin\MSBuild.exe ENOENT
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_proces
s.js:240:19)
gyp ERR! stack     at onErrorNT (internal/child_process.js:415:16)
gyp ERR! stack     at process._tickCallback (internal/process/next_tick.js:63:19
)
gyp ERR! System Windows_NT 6.3.9600
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodej
s\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\xampp\htdocs\CN-pool\node_bignum
gyp ERR! node -v v10.15.3
gyp ERR! node-gyp -v v3.8.0
gyp ERR! This is a bug in `node-gyp`.
gyp ERR! Try to update node-gyp and file an Issue if it does not help:
gyp ERR!     <https://github.com/nodejs/node-gyp/issues>
npm ERR! code ELIFECYCLE
npm ERR! errno 7
npm ERR! bignum@0.13.0 install: `prebuild-install || node-gyp rebuild`
npm ERR! Exit status 7
npm ERR!
npm ERR! Failed at the bignum@0.13.0 install script.
npm ERR! This is probably not a problem with npm. There is likely additional log
ging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2019-05-21T0
2_24_36_854Z-debug.log

C:\xampp\htdocs\CN-pool\node_bignum>