npm install error on Travis

[cvrebert]

Sometimes, when trying to install a project that indirectly depends on phantomjs on Travis, I'm seeing this error:

$ nvm use 0.10
Now using node v0.10.29
$ node --version
v0.10.29
$ npm --version
1.4.14
[...]
$ npm install
[...]
> phantomjs@1.9.7-15 install /home/travis/build/twbs/bootstrap/node_modules/grunt-contrib-qunit/node_modules/grunt-lib-phantomjs/node_modules/phantomjs
> node install.js
Writing location.js file
PhantomJS is already installed at /usr/local/phantomjs/bin/phantomjs.
npm ERR! cb() never called!
npm ERR! not ok code 0

which causes the build to fail 😢
Full log: https://travis-ci.org/twbs/bootstrap/jobs/31650361

[nicks]

i don't think that error is coming from phantomjs? it looks like you have some odd npm customization scripts that are actually emitting the error, e.g., uncached-npm-install.sh

[cvrebert]

All that script does is install using an npm shrinkwrap file: https://github.com/twbs/bootstrap/blob/master/test-infra/uncached-npm-install.sh

[nicks]

ya, a quick google search says that the "cb() never called" error is an internal npm error; you should probably file a bug with them

The PhantomJS is already installed at message indicates that the phantomjs installer exited correctly.