circular references cause unexpected behavior in a few rare cases

[mgh]

circular references can't resolve correctly if exports is overwritten:

in module A:

exports = foo

then later in module A:

doSomeFunction()

that results in an import of module A.

expected: module A is partially defined with foo
actual: jsio doesn't pull the new exports out of the module until after the import returns, so we don't have access to foo.

[souparno]

https://github.com/souparno/jsio.js/tree/master/example2
^ circular dependency with jsio