Hey Dmitry,
The maximum compatible version of our Javascript analyzer with SonarQube v6.7.7 is far less than v7.3 (for comparison, the maximum supported version for SonarQube v7.9 LTS is v6.2.2 (see our Plugin Version Matrix. If you wish to use the latest versions of our analyzers, you should update to the latest SonarQube version (right now, v8.8).
Regardless, the issuee you face is probably the same one as here: SonarJS fails parsing a file: Unexpected character '#'
We need to switch a dependency but ran into some issues. I’ll ping internally to see if it’s a topic we plan to look at it again soon (such as before our upcoming LTS).