After playing around with this, I didn't wind up using prettier formatting for the second edition.

Here are my notes from February with some examples of why. The gist is that vertical space is at more of a premium in a printed book than it is on your screen.

I’m also not 100% sure I even want my code samples to be prettier-formatted. For example, from #any:

function renderSelector(props: ComponentProps) { /* ... */ }

let selectedId: number = 0;
function handleSelectItem(item: any) {
  selectedId = item.id;
}

renderSelector({onSelectItem: handleSelectItem});

Putting the /* ... */ all on one line feels pretty inoffensive to me. This also feels pretty inoffensive:

function add(a: number, b: number) { return a + b; }
//       ~~~ Duplicate function implementation
function add(a: string, b: string) { return a + b; }
//       ~~~ Duplicate function implementation

So maybe the more useful check is for line length? Here’s another one:

return [['Toni', 'Morrison'], ['Maya', 'Angelou']];

prettier wants to split this across four lines.

I wound up with 237 / 974 samples failed. I think a lot of this is a cascading effect, though, where it’s considering prefixed samples. This is something I can come back to, I don’t think it’s important now.