I know it's a joke, but the thing about sourcemaps is already do-able. If you have a sourcemap describing A->B, and a separate sourcemap describing B->C, then t

I know it's a joke, but the thing about sourcemaps is already do-able. If you have a sourcemap describing A->B, and a separate sourcemap describing B->C, then there already tools for composing the sourcemaps to create a sourcemap for A->C. (This is similar to a thing that Browserify and Webpack have to do when you're using a transform like Babel on each of the individual input files.)