Does dxf-viewer expose included three.js?

[yanliang2004]

Besides load and draw an existing dxf file, I also need to add some shapes to the canvas. When I import classes from three.js, I get the warning:

WARNING: Multiple instances of Three.js being imported.

I think I can use the three.js already included in dxf-viewer, but I can't find an export or property referencing three.js classes. How can I use the three.js included in dxf-viewer?