index.html

<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

  <title>Index</title>
</head>
<body>
  <!--<script src="dist/nodegit.js"></script>-->

  <script>
    var Module = {
      onRuntimeInitialized: function() {
        var loc = allocate(intArrayFromString('some_path'), 'i8', ALLOC_STACK);
        // Arbitrary amount of memory.
        var repo = Module._malloc(1024)

        // Initialize a repository in memory.
        var err = _git_repository_init(repo, loc)
        console.log(err); // 0

        // Open that repository.
        var err = _git_repository_open(repo, loc)
        console.log(err); // 0

        // Change the path.
        var newloc = allocate(intArrayFromString('some_path2'), 'i8', ALLOC_STACK);
        var err = _git_repository_open(repo, newloc)
        console.log(err); // -3
      }
    };

  </script>
  <script src="libgit2.js"></script>
</body>
</html>