I found myself with some errors while installing packages on NPM which was related to xCode.
> npm install > firstname.lastname@example.org install /Users/user/cloudwales/node_modules/fsevents > node-gyp rebuild No receipt for 'com.apple.pkg.CLTools_Executables' found at '/'. No receipt for 'com.apple.pkg.DeveloperToolsCLILeo' found at '/'. No receipt for 'com.apple.pkg.DeveloperToolsCLI' found at '/'. gyp: No Xcode or CLT version detected! gyp ERR! configure error gyp ERR! stack Error: `gyp` failed with exit code: 1 gyp ERR! stack at ChildProcess.onCpExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:351:16) gyp ERR! stack at ChildProcess.emit (events.js:210:5) gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:272:12) gyp ERR! System Darwin 19.3.0 gyp ERR! command "/usr/local/Cellar/node/12.11.1/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild" gyp ERR! cwd /Users/chrisbowen/projects/current/cloudwales/node_modules/fsevents gyp ERR! node -v v12.14.0 gyp ERR! node-gyp -v v5.0.5 gyp ERR! not ok npm WARN optional SKIPPING OPTIONAL DEPENDENCY: email@example.com (node_modules/fsevents): npm WARN optional SKIPPING OPTIONAL DEPENDENCY: firstname.lastname@example.org install: `node-gyp rebuild` npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1 audited 17261 packages in 5.162s 32 packages are looking for funding run `npm fund` for details found 0 vulnerabilities
I managed to find a fix which was to do with the xcode-select path, heres what worked for me:
Open a terminal window and type
xcode-select -print-path then
sudo xcode-select --reset
> xcode-select -print-path /Library/Developer/CommandLineTools > sudo xcode-select --reset > xcode-select -print-path /Applications/Xcode.app/Contents/Developer