require('fs');    // OK - there is an externs file for it
require('other'); // $ Alert - there is an externs file, but it is not a Node.js module
require('foo');   // OK - declared as a dependency
require('bar/sub'); // OK - 'bar' declared as a dependency
require('./local'); // OK - local import
require('/global'); // OK - global import
require('mod');     // $ MISSING: Alert // this is resolved due to the package.json file named "mod", but Node.js would not find it
require('undeclared'); // $ Alert
require('jade!./template.jade'); // OK - WebPack loader
require('imports?$=jquery!./m.js'); // OK - WebPack shim
require('react'); // OK - peer dependency