Angular 2 - 404 traceur not found

Question

I\'ve followed the starting guide and expanded a little upon for a previous angular 2 version. I\'ve updated my revision and changed everything accordingly. When I am runnin

Answer 1

In my case I didn't even had traceur as a dependency in node_modules and the app was working fine but all of a sudden started to ask for traceur after adding a library that didn't need traceur either.

The solution was to reference the newly added libraries from bundles folders instead of src (or default folder) in system.config.js and specifying the .umd.js version of files. Also, I had to remove the main entry from the packages section.

The reason behind is that loading the umd modules from the bundle folders does not trigger the traceur transpiler as it assumes the library module is already in the correct format. Otherwise, it may assume that the code is written in es2015 and it needs transpilation so it invokes traceur.

I came across this traceur issue after trying to connect to a Firebase instance from a perfectly runnable "Tour of Heroes" app with the aid of AngularFire2. I tried all the answers here but none of them helped, so I googled until I found this github issue.