Author here. Unfortunately, I think worded that a bit confusingly in the article. I'm used to working with runtimes that run TS natively and didn't have to care about .d.ts files myself for a long time. From that perspective creating them by running the tsc compiler feels like a manual step for me.
There are cases where folks write them by hand, but that's not what I had in mind when writing the article. I've rephrased that part a bit to hopefully make it less confusing.
There are cases where folks write them by hand, but that's not what I had in mind when writing the article. I've rephrased that part a bit to hopefully make it less confusing.