What are the options that I have if I want to use SASS (SCSS) and Ecmascript 6 (or even Typescript) in my projects? Is there a tool to transpile SASS, Ecmascript6 or Typescript that I can use with Adobe AEM?
You can choose to configure the preprocessors configuration per client library or system-wide.
Reference: Using Client-Side Libraries
For LESS, AEM gives oob support but for sass, you need to make changes in AEM codebase so that sass written file can be converted to CSS file client library during code compilation.
I think the jsProcessor attribute is not working on AEM 6.4.
I've tried lots of things and was not able to make it work.
Also, in this thread there is a conclusion it is not working on 6.4: https://forums.adobe.com/thread/2569095
I want a processor that transforms Typescript or ECMA6 into ECMA5.