Is it possible to set up preprocessors (es6, sass, jsx, jade) without first compiling in the project?

Question

Sass

Sometimes you want to create one or two files and write a small mock-up of the future code. But the lack of use of preprocessors overshadows this approach and forces the creation of a very weighty project gulp + browsersync + ..., which also exposes the problem with the lack of RAM, and you can’t call this approach “quick check”.
This is why the question arose, are there real-time compilers that compile directly in the browser? So it would be possible to create one index.html (index.jade) + AutoReload as a blank in FF.
And a separate question - webpack can do this, and if so, can it be called the deployment of the project "quickly"?