gyp ERR, Npm is unable to get local issuer certificate

I am working on clean Windows 10 installation. Only thing is cygwin that I installed to get unix commands in the cmd.

When I type npm install -g @angular/cli it downloads the necessary files but I receive an error:

gyp ERR! configure error
gyp ERR! stack Error: unable to get local issuer certificate
gyp ERR! stack at Error (native)
gyp ERR! stack at TLSSocket.<anonymous> (_tls_wrap.js:1092:38)
gyp ERR! stack at emitNone (events.js:86:13)
gyp ERR! stack at TLSSocket.emit (events.js:185:7)
gyp ERR! stack at TLSSocket._finishInit (_tls_wrap.js:610:8)
gyp ERR! stack at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:440:38)
gyp ERR! System Windows_NT 10.0.15063
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\user\\AppData\\Roaming\\npm\\node_modules\\@angular\\cli\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd C:\Users\user\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\node-sass
gyp ERR! node -v v6.11.2
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok
Build failed with error code: 1


I edited npm config file like 'npm config edit'. In the opened file I added the following settings:

strict-ssl=false
http_proxy=null
proxy=null


But this does not work and I still receive the same error. What more, npm install also breaks with the same result.

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