I upgraded the PhpED 18, and it seems to me, the new syntax and features in JavaScript is not implemented.

For example let keyword.

http:// es6-features.org/#BlockScopedVariables

Is there a way to fix it myself? Possibly the expansion of the library?

Sorry, ECMAScript 6 is not supported. Adding support for such things requires a lot of work. There is nothing you can do.

OK., i understand.

Any plans in the future, or in following version for this support? Including better CSS3 syntax check?

yes, sure. We revisit all the features and tight them up