There are further bugs: `for path in paths` should be `for (const path of paths)` JS will immediately error on the lack of parens, but the `in` vs `of` iter

There are further bugs: `for path in paths` should be `for (const path of paths)` JS will immediately error on the lack of parens, but the `in` vs `of` iterates over indexes, not values, and those indexes are unfortunately converted to strings (since `for-in` is object field-name iteration). So even TypeScript would not have caught it when the (stringified) index is used as the first argument of `fs.watch()`.