Just in case you missed it, Mojolicious is also available for TypeScript now, and the developer experience is pretty close to the Perl original. ;) https://mojojs.org
Having released SQL::Abstract 2 people are trying to convince me to port things.
Since the SQLA2 expr layer was deliberately designed to be JSONable I have a horrible feeling I can actually do so and I might actually crack and do it, but if I do I'll be writing vanilla ES6. If you love typescript enough more, a commit bit will be yours for the asking.