vi.massias,
In our testing we were able to see the JavaScript in PHP colored, but validation and content assist was missing. As far as the coloring is concerned, perhaps there’s something different with the file you’re trying with – do you mind sharing a sample?
For validation (and content assist) support – CodeMix inherits this functionality from VS Code’s PHP IntelliSense extension (https://github.com/felixfbecker/vscode-php-intellisense) so the additional support needs to be make it to this extension. Note that we tried the alternative PHP IntelliPhense extension too, but that didn’t provide the desired support either. We’ll file a bug against the IntelliSense extension and follow up there, hopefully they will add support for this case.
Thank you for the report!
–Swapna
Genuitec Support