I had a need the other day to execute some typescript in an org document.
Now I know that there's an ob-typescript package but that doesn't quite
work the way I want and expects typescript to be installed globally (which
runs into a variety of versioning issues).

There is a better option available with the `npx` program (installed
alongside `npm`) which can install a package along with its dependencies
into a temporary sandbox and run its binaries.

I rewrote the typescript babel plugin to do this and then realized that
there was relatively little in it beyond variable and function names that
was typescript-specific. The exact same process can be used for anything
that has an interpreter up on npm. Coffeescript, mermaidjs, all sorts of
things.

So I made a macro. I'm interested what people here think:
https://github.com/togakangaroo/create-ob-npx