PS E:\SupervisorTech\workspace\contractmanagement\front> yarn add node-sass --dev
yarn add v1.17.3
[1/4] Resolving packages...
[2/4] Fetching packages...
info fsevents@2.0.7: The platform "win32" is incompatible with this module.
info "fsevents@2.0.7" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.9: The platform "win32" is incompatible with this module.
info "fsevents@1.2.9" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning "react-scripts > @typescript-eslint/eslint-plugin@1.13.0" has incorrect peer dependency "eslint@^5.0.0".
warning "react-scripts > @typescript-eslint/parser@1.13.0" has incorrect peer dependency "eslint@^5.0.0".
[4/4] Building fresh packages...
[1/3] ⡀ core-js
[-/3] ⢀ waiting...
error E:\SupervisorTech\workspace\contractmanagement\front\node_modules\node-sass: Command failed.
Exit code: 1
Command: node scripts/build.js
Arguments:
Directory: E:\SupervisorTech\workspace\contractmanagement\front\node_modules\node-sass
Output:
Building: D:\Program Files\node-v10.16.1-win-x64\node.exe E:\SupervisorTech\workspace\contractmanagement\front\node_modules\node-gyp\bin\node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
gyp info it worked if it ends with ok
gyp verb cli [ 'D:\\Program Files\\node-v10.16.1-win-x64\\node.exe',
gyp verb cli   'E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\node-gyp\\bin\\node-gyp.js',
gyp verb cli   'rebuild',
gyp verb cli   '--verbose',
gyp verb cli   '--libsass_ext=',
gyp verb cli   '--libsass_cflags=',
gyp verb cli   '--libsass_ldflags=',
gyp verb cli   '--libsass_library=' ]
gyp info using node-gyp@3.8.0
gyp info using node@10.16.1 | win32 | x64
gyp verb command rebuild []
gyp verb command clean []
gyp verb clean removing "build" directory
gyp verb command configure []
gyp verb check python checking for Python executable "python2" in the PATH
gyp verb `which` failed Error: not found: python2
gyp verb `which` failed     at getNotFoundError (E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\SupervisorTech\workspace\contractmanagement\front\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\SupervisorTech\workspace\contractmanagement\front\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:153:21)
gyp verb `which` failed  python2 { Error: not found: python2
gyp verb `which` failed     at getNotFoundError (E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\SupervisorTech\workspace\contractmanagement\front\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\SupervisorTech\workspace\contractmanagement\front\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\SupervisorTech\workspace\contractmanagement\front\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:153:21)
gyp verb `which` failed   stack:
gyp verb `which` failed    'Error: not found: python2\n    at getNotFoundError (E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\which\\which.js:13:12)\n    at F (E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\which\\which.js:68:19)\n    at E (E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\which\\which.js:80:29)\n    at E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\which\\which.js:89:16\n    at E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\isexe\\index.js:42:5\n    at E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\isexe\\windows.js:36:5\n    at FSReqWrap.oncomplete (fs.js:153:21)',
gyp verb `which` failed   code: 'ENOENT' }
gyp verb check python checking for Python executable "python" in the PATH
gyp verb `which` succeeded python D:\Programs\Python\Python37\python.EXE
gyp ERR! configure error
gyp ERR! stack Error: Command failed: D:\Programs\Python\Python37\python.EXE -c import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack   File "<string>", line 1
gyp ERR! stack     import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack                                ^
gyp ERR! stack SyntaxError: invalid syntax
gyp ERR! stack
gyp ERR! stack     at ChildProcess.exithandler (child_process.js:294:12)
gyp ERR! stack     at ChildProcess.emit (events.js:198:13)
gyp ERR! stack     at maybeClose (internal/child_process.js:982:16)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:259:5)
gyp ERR! System Windows_NT 10.0.17134
gyp ERR! command "D:\\Program Files\\node-v10.16.1-win-x64\\node.exe" "E:\\SupervisorTech\\workspace\\contractmanagement\\front\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd E:\SupervisorTech\workspace\contractmanagement\front\node_modules\node-sass
gyp ERR! node -v v10.16.1
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok


PS E:\SupervisorTech\workspace\contractmanagement\front> yarn global add windows-build-tools
yarn global v1.17.3
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
error C:\Users\Administrator\AppData\Local\Yarn\Data\global\node_modules\windows-build-tools: Command failed.
Exit code: 1
Command: node ./dist/index.js
Arguments:
Directory: C:\Users\Administrator\AppData\Local\Yarn\Data\global\node_modules\windows-build-tools
Output:
Downloading python-2.7.15.amd64.msi
[============================================>] 100.0% of 20.25 MB (237.5 kB/s)
Downloaded python-2.7.15.amd64.msi. Saved to C:\Users\Administrator\.windows-build-tools\python-2.7.15.amd64.msi.
Downloading vs_BuildTools.exe
[============================================>] 100.0% of 1.12 MB (298.63 kB/s)
Downloaded vs_BuildTools.exe. Saved to C:\Users\Administrator\.windows-build-tools\vs_BuildTools.exe.

Starting installation...
Please restart this script from an administrative PowerShell!
The build tools cannot be installed without administrative rights.
To fix, right-click on PowerShell and run "as Administrator".
info Visit https://yarnpkg.com/en/docs/cli/global for documentation about this command.

问题原因： windows 缺少编译的运行环境

解决办法：

yarn global add node-gyp  windows-build-tools

执行完上述安装之后 node-sass就能成功安装了