Adding JavaScript ES6 to Dreamweaver CS6

The "Edit > Preferences > Linting then Edit the JS file" is a bogus answer, there is no "linting" option in the preferences of Dreamweaver CS6. The "linting" feature wasn't added until Creative Cloud. It is unlikely that there will be a patch, Adobe wants you to switch to a subscription-based version instead.

Screenshot of Dreamweaver settings

Ok, just go to: Edit > Preferences > Linting then Edit the JS file.

add this property:

"esversion" : 6

This helped me.