PSA: if ng -v returns an error.

[matt-erhart]

For some unknown reason, ng commands stopped working. A lot of other people on various OSs were having a similar problem. I uninstalled npm, uninstalled node, and deleted the global node_modules folder, and installed the latest version of everything and got ng commands working again. Search for a 'complete' uninstall of npm/node to find your global node_modules folder for your OS.

[guidoffm]

I get this error:

C:\Users\guido>npm -v
3.10.5

C:\Users\guido>node -v
v6.2.2

C:\Users\guido>ng -v
fs.js:634
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^

TypeError: path must be a string or Buffer
    at TypeError (native)
    at Object.fs.openSync (fs.js:634:18)
    at Object.fs.readFileSync (fs.js:502:33)
    at Function.Version.fromProject (C:\Users\guido\AppData\Roaming\npm\node_modules\angular-cli\upgrade\version.js:87:31)
    at Function.Version.isPreWebpack (C:\Users\guido\AppData\Roaming\npm\node_modules\angular-cli\upgrade\version.js:111:31)
    at Function.Version.assertPostWebpackVersion (C:\Users\guido\AppData\Roaming\npm\node_modules\angular-cli\upgrade\version.js:97:18)
    at C:\Users\guido\AppData\Roaming\npm\node_modules\angular-cli\bin\ng:25:15
    at C:\Users\guido\AppData\Roaming\npm\node_modules\angular-cli\node_modules\resolve\lib\async.js:44:21
    at ondir (C:\Users\guido\AppData\Roaming\npm\node_modules\angular-cli\node_modules\resolve\lib\async.js:187:31)
    at C:\Users\guido\AppData\Roaming\npm\node_modules\angular-cli\node_modules\resolve\lib\async.js:153:39

[maartenpaauw]

Tried it multiple times. Still no success.

[matt-erhart]

Hmmm, what I did worked for windows 10. I suspect the trick is to find all the files node/npm have placed around your OS to get a true clean slate.

[filipesilva]

@matt-erhart that's my recommendation for when ng commands stop working overall. There might be a bunch of causes for it though... I tried to gather the common ones in https://github.com/angular/angular-cli/issues?utf8=%E2%9C%93&q=is%3Aissue%20label%3A%22type%3A%20faq%22%20 .

I appreciate you sharing your solution, but I can't keep this issue open as it's not actionable.

@guidoffm that specific issue is #2178

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