Link back to polypackage example in the what-about-transitional-packages blurb

[jdalton]

The what-about-transitional-packages blurb references:

This allows for truly gradual upgrades of large codebases. Keep in mind, since requires can be dynamic (and test frameworks quite often do make use of this feature), it may not always be possible to mechanically upgrade a single file in a large codebase without breaking other parts of the application.

Alludes to the poly-packages bit

The transpiler would rewrite any imports from "./lib/" in module.js to "./" in the transpiled CommonJS modules. Since standard modules use a declarative syntax for imports, it is possible to do this transformation soundly and reliably.

But it isn't super clear. A link back to that section would be helpful. I also feel like this is an understood and established gotcha in the age of babel plugins.