Link to raytraceblockmode
Importing the class
Link to importing-the-class
It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.
Link to enum-constants
RayTraceBlockMode is an enum. It has 3 enum constants. They are accessible using the code below.
RayTraceBlockMode.COLLIDER RayTraceBlockMode.OUTLINE RayTraceBlockMode.VISUAL