Lit / esbuild doesn't work with latest gts

[tushuhei]

I'm working on a web application built with Lit and esbuild.
It was functioning correctly with gts@5.3.1, but broke after upgrading to gts@6.0.2.

Demo:
https://stackblitz.com/edit/stackblitz-starters-yvbnm5rc

Steps to reproduce:

• run npm i
• run npx http-server build and see the preview where no string is rendered.
• downgrade gts to 5.3.1
• run npm i
• run npx http-server build and see the preview where "hello world" is rendered.