Gulp Karma "Script error"

Question

I'm using gulp-karma + mocha + chai + sinon in order to unit test some front end.

The nasty thing I keep getting into is the "Script Error" message that karma spits out without any other relevant detail.

How can I make karma display the source of the error also ?

Answer 1

This might be a little late, but as others may find this problem I thought I'd add some notes.

The Script error comes when the error is produced in a different domain than it's consumed. Browsers then remove the error details for security reasons. Typically this happens if:

• you load scripts/pages from different domains
• you run eval code. Note that this is what webpack often does in development scenarios

To mitigate this you can

• add relevant HTTP CORS headers
• skip running eval code - if you're running webpack, choose a devtool not containing "eval"
• load resources from the same domain

Hope it helps