Evaluate a file containing Jsonnet code, return a JSON string.
The returned string should be cleaned up with jsonnet_realloc.
\param filename Path to a file containing Jsonnet code.
\param error Return by reference whether or not there was an error.
\returns Either JSON or the error message.
Evaluate a file containing Jsonnet code, return a JSON string.
The returned string should be cleaned up with jsonnet_realloc.
\param filename Path to a file containing Jsonnet code. \param error Return by reference whether or not there was an error. \returns Either JSON or the error message.