nativeParseInt is not a function

[screendriver]

My code to test uses some lodash functions like _.parseInt(). In Test'em they throw following error

TypeError: nativeParseInt is not a function
    at parseInt (http://localhost:7357/565/src/jspm_packages/npm/lodash@4.10.0/parseInt.js:47:10)

When I don't use Test'em (e.g. a mocha HTML page hostet with broswer-sync) the error disappears.

Does somebody has any idea what's going on here?

[johanneswuerbach]

Do you do any transpiling usually before running your tests? Looks like testem is shipping the raw sources.

[screendriver]

Yes. I am using jspm, SystemJS and ES2015 with the Babel transpiler.