Doesn't work with unicode Code Point Escape Sequence

Tried this on the online demo as well, and can't get it working.

ES6 - unicode Code Point Escape Sequence

\u{714E}\\u{8336}\

and similar. All throws

[polygonplanet]

\u{714E}\\u{8336}\

is inclues invalid token \
Is this sample really like followings?

\u{714E}\u{8336}