All features of original JASS language are implemented:

• basic types and built in operations
• function callbacks
• external natives
• tree-based type system
• control structures including elseif
• arrays and local arrays

Major differences from JASS:

• module system, import keyword
• free order of functions defining

What is not implemented:

• garbage collector (memory leaks when allocating strings and functions references)
• threading (at the moment it is no way to interapt hjass function)