getting so many errors while doing "npm install" - node.js

Question

I am working on an ASP.NET Core Web Application with Angular (I have VS2019 Enterprise installed on Windows 10), it is working fine and everything but when I try to publish it to Azure App Service. I get many errors on the npm i step.
I tried all the solutions I could find:
install windows-build-tools
update visual studio and install Desktop Build Tools
install node-gyp
modify configure.js of node-gyp in node_modules
Uninstall Node and reinstall the latest version
I still cannot make it work.
the latest error I got is this :
npm install
> node-sass#4.9.3 install C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass
> node scripts/install.js
Downloading binary from https://github.com/sass/node-sass/releases/download/v4.9.3/win32-x64-72_binding.node
Cannot download "https://github.com/sass/node-sass/releases/download/v4.9.3/win32-x64-72_binding.node":
HTTP error 404 Not Found
Hint: If github.com is not accessible in your location
try setting a proxy via HTTP_PROXY, e.g.
export HTTP_PROXY=http://example.com:1234
or configure npm proxy via
npm config set proxy http://example.com:8080
> node-sass#4.9.3 postinstall C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass
> node scripts/build.js
Building: C:\Program Files\nodejs\node.exe C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\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 [
gyp verb cli 'C:\\Program Files\\nodejs\\node.exe',
gyp verb cli 'C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\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 verb cli ]
gyp info using node-gyp#3.8.0
gyp info using node#12.14.1 | 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` succeeded python2 C:\Python27\python2.EXE
gyp verb check python version `C:\Python27\python2.EXE -c "import sys; print "2.7.17
gyp verb check python version .%s.%s" % sys.version_info[:3];"` returned: %j
gyp verb get node dir no --target version specified, falling back to host node version: 12.14.1
gyp verb command install [ '12.14.1' ]
gyp verb install input version string "12.14.1"
gyp verb install installing version: 12.14.1
gyp verb install --ensure was passed, so won't reinstall if already installed
gyp verb install version is already installed, need to check "installVersion"
gyp verb got "installVersion" 9
gyp verb needs "installVersion" 9
gyp verb install version is good
gyp verb get node dir target node version installed: 12.14.1
gyp verb build dir attempting to create "build" dir: C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass\build
gyp verb build dir "build" dir needed to be created? C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass\build
gyp verb find vs2017 Found installation at: C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise
gyp verb find vs2017 - Found Microsoft.VisualStudio.Component.Windows10SDK.18362
gyp verb find vs2017 - Found Microsoft.VisualStudio.Component.VC.Tools.x86.x64
gyp verb find vs2017 - Found Microsoft.VisualStudio.VC.MSBuild.Base
gyp verb find vs2017 - Using this installation with Windows 10 SDK
gyp verb find vs2017 using installation: C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise
gyp verb build/config.gypi creating config file
gyp verb build/config.gypi writing out config file: C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass\build\config.gypi
gyp verb config.gypi checking for gypi file: C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass\config.gypi
gyp verb common.gypi checking for gypi file: C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass\common.gypi
gyp verb gyp gyp format was not specified; forcing "msvs"
gyp info spawn C:\Python27\python2.EXE
gyp info spawn args [
gyp info spawn args 'C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\node_modules\\node-gyp\\gyp\\gyp_main.py',
gyp info spawn args 'binding.gyp',
gyp info spawn args '-f',
gyp info spawn args 'msvs',
gyp info spawn args '-G',
gyp info spawn args 'msvs_version=2015',
gyp info spawn args '-I',
gyp info spawn args 'C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\node_modules\\node-sass\\build\\config.gypi',
gyp info spawn args '-I',
gyp info spawn args 'C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\node_modules\\node-gyp\\addon.gypi',
gyp info spawn args '-I',
gyp info spawn args 'C:\\Users\\bibaghdad\\.node-gyp\\12.14.1\\include\\node\\common.gypi',
gyp info spawn args '-Dlibrary=shared_library',
gyp info spawn args '-Dvisibility=default',
gyp info spawn args '-Dnode_root_dir=C:\\Users\\bibaghdad\\.node-gyp\\12.14.1',
gyp info spawn args '-Dnode_gyp_dir=C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\node_modules\\node-gyp',
gyp info spawn args '-Dnode_lib_file=C:\\Users\\bibaghdad\\.node-gyp\\12.14.1\\<(target_arch)\\node.lib',
gyp info spawn args '-Dmodule_root_dir=C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\node_modules\\node-sass',
gyp info spawn args '-Dnode_engine=v8',
gyp info spawn args '--depth=.',
gyp info spawn args '--no-parallel',
gyp info spawn args '--generator-output',
gyp info spawn args 'C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\node_modules\\node-sass\\build',
gyp info spawn args '-Goutput_dir=.'
gyp info spawn args ]
gyp verb command build []
gyp verb build type Release
gyp verb architecture x64
gyp verb node dev dir C:\Users\bibaghdad\.node-gyp\12.14.1
gyp verb found first Solution file build/binding.sln
gyp verb using MSBuild: C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\15.0\Bin\MSBuild.exe
gyp info spawn C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\15.0\Bin\MSBuild.exe
gyp info spawn args [
gyp info spawn args 'build/binding.sln',
gyp info spawn args '/nologo',
gyp info spawn args '/p:Configuration=Release;Platform=x64'
gyp info spawn args ]
gyp ERR! UNCAUGHT EXCEPTION
EXEC(0,0): Error : spawn C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\15.0\Bin\MSBuild.exe ENOENT
gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:264:19)
gyp ERR! stack at onErrorNT (internal/child_process.js:456:16)
gyp ERR! stack at processTicksAndRejections (internal/process/task_queues.js:81:21)
gyp ERR! System Windows_NT 10.0.17763
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\bibaghdad\\Documents\\Projects\\commercial-innovation-portal\\InnovationsPortal\\ClientApp\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd C:\Users\bibaghdad\Documents\Projects\commercial-innovation-portal\InnovationsPortal\ClientApp\node_modules\node-sass
gyp ERR! node -v v12.14.1
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>
EXEC(0,0): Error code: 7
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.9 (node_modules\webpack-dev-server\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.9 (node_modules\watchpack\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.9 (node_modules\karma\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#2.0.7 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#2.0.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents#1.2.9 (node_modules\#angular\compiler-cli\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents#1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! node-sass#4.9.3 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass#4.9.3 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

Answer 1

You can try to remove package-lock.json and relaunch npm install
It worked for me, thanks to this comment https://github.com/sass/node-sass/issues/2773#issuecomment-559399501

Answer 2

I suspect it is an issue with node-gyp. From your error log I can see the version is old [3.x] which shouldn't be and you should update the version to latest.
If you are using MacOS, you can update node-gyp to latest version using this command:
$ [sudo] npm explore npm -g -- npm install node-gyp#latest
The sudo above is optional. Use it only if necessary.
If you are on Windows, you can update the node-gyp version to latest following the document here
If this resolves your problem and you are curious about node-gyp you can always read it here