Twig syntax errors are not throwing exceptions

[HakS]

kalastatic.build() promise doesn't seem to be returning any TwigException as an error or exception, so it seems to continue trying to render flawed twig files even after Twig.js is displaying syntax errors, which makes it generate even more runtime errors that eventually breaks the browsersync instance

I have Kalastatic running in a custom Node JS command rather than using the kalastatic bin file, however a lot of this code is based on yours (runs kalastatic.build(), when this promise finishes, browsersync watches files, when it detects a change, kalastatic.build() is called again, and here is when this happens)

Please let me know if this is actually an error from Twig or from any of Metalsmith transformers so this ticket gets reported there

[RobLoach]

Similar things happen with SASS too. Would love better error reporting. I believe it's in metalsmith-jstransformer