I reproduced the following bug with version 0.10.2 and 0.10.3 but it worked fine in 0.9.2 (all under Chrome 40).

Here is the code:

var github = new Github({
    username: "nicolas-van",
    password: 'thepassword',
    auth: "basic",
});

var repo = github.getRepo("nicolas-van", "githubapitest");
repo.write("gh-pages", "test.html", 'hello', '', function(err, res) {
    debugger;
});

This code works fine if test.html doesn't exist yet, but crashes with a strange error if it already exists:

 Uncaught SyntaxError: Unexpected token e

I must precise that, in my test, test.html is a simple text file containing the word "test".

Bu debugging a little I also saw that it's not really the method write() that causes problem but the method getSha() (which is called at the beginning of the write() method).