messageformat
Add meaningful error messages
I was bitten by [sprintf] huh?, this should make debugging for other people much easier.
Another possibility would be depending on https://github.com/alexei/sprintf.js which looks at lot like the inline sprintf-implementation.
It is the alexei implementation, just inlined. Feel free to just re-inline the latest.
Wouldn't it be better to depend on it in the package.json? This means updates in the future will be easier to incorporate. I am willing to do this work.
Happy to take a PR. It works like it currently does because I released Jed in 2012 and sprintf wasn't on Github until 2013. It was just a file on his website.