Documentation I've found online for Unit Testing JavaScript, tends to involve using Webpack or other build tools that integrates at transpile time of JavaScript files. Normally this is fine and I do this with other projects. In the case of this question, the build stack which is used has preconfigured transpiling that we are unable to modify per project. This means I cannot hook into the transpile process to Unit test the code.

Instead, what I'd like to do, is point a Unit test project at the transpiled code and run unit tests against that. I respect it would have to be manually triggered to test and wouldn't run at build time, but it would at least give code confidence.

Has anyone achieved such a thing or know how to achieve it? I'm not tied to a JavaScript unit test framework so if there's one that does it best please say.