If requirejs hit a source file it didn't like, it would crash. However, preloaded tests would continue and getting a passing grade on travis-ci (exit code 0).
The AMD-module system Filer uses can't handle require() calls that reference a node module. By creating two distributions we allow the node version to use a full implementation of RequireJS, which gracefully falls back to Node's require() when RequireJS can't find the module in its registered paths.