[BUG] [release-typescript] JSDoc regression

[jribbink]

Current Behavior

(this is a problem on the release-typescript branch and not master)

With the addition of typescript to the build process, we have regressed in JSDoc type generation. These types are no longer getting generated & only TS files have their corresponding .d.ts made.

Expected Behavior

Should generate .d.ts for both js & ts

Steps To Reproduce

Build on that branch with a js file imported.

Environment

n/a

What are you currently working on that this is blocking?

No response