I love vanilla JavaScript. All my personal projects are plain JavaScript. No Typescript. But in a company setting, it's almost impossible to find plain JavaScript roles.

Plain JS is also a lot better with AI. I don't recall Claude ever making any mistakes in terms of getting the type wrong with plain JS since I started using it. It's just not the kind of mistake that AI makes.

I feel somewhat vindicated by this. I've been saying for years that coding isn't the hard part, type correctness isn't the hard part. I also made a point that complex interfaces are a greater danger and that Typescript tends to encourage people to design complex interfaces... And look, this certainly seems to be reflected in the training data because my AI token usage at work (Typescript) is far greater than on my side projects for the same task complexity.

This is kind of proving my point that plain JS code is better architeted overall than Typescript code... It makes sense to me, any complex plain JS code MUST be well architecture because JS is unforgiving. The spaghetti doesn't go very far in JS.