Вот сообщение об ошибке:

node-sass@0.9.6 install /Users/jessicashao/WebstormProjects/open5/node_modules/node-sass
node build.js

(node:47028) [DEP0006] DeprecationWarning: child_process: options.customFds option is deprecated. Use options.stdio instead.

gyp WARN install got an error, rolling back install

gyp ERR! configure error

gyp ERR! stack Error: tunneling socket could not be established, statusCode=400

gyp ERR! stack at ClientRequest.onConnect (/usr/local/lib/node_modules/npm/node_modules/request/node_modules/tunnel-agent/index.js:166:19)

gyp ERR! stack at Object.onceWrapper (events.js:319:30)

gyp ERR! stack at emitThree (events.js:136:13)

gyp ERR! stack at ClientRequest.emit (events.js:217:7)

gyp ERR! stack at Socket.socketOnData (_http_client.js:474:11)

gyp ERR! stack at emitOne (events.js:116:13)

gyp ERR! stack at Socket.emit (events.js:211:7)

gyp ERR! stack at addChunk (_stream_readable.js:263:12)

gyp ERR! stack at readableAddChunk (_stream_readable.js:250:11)

gyp ERR! stack at Socket.Readable.push (_stream_readable.js:208:10)

gyp ERR! System Darwin 17.7.0

gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"

gyp ERR! cwd /Users/jessicashao/WebstormProjects/open5/node_modules/node-sass

gyp ERR! node -v v8.11.2

gyp ERR! node-gyp -v v3.6.2

gyp ERR! not ok

Build failed

npm WARN open5@0.6.0 No repository field.

npm WARN open5@0.6.0 license should be a valid SPDX license expression

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! node-sass@0.9.6 install: node build.js

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the node-sass@0.9.6 install script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.