Comment by anonzzzies

> If I have a 5-10 year old Node project, it might work well on Deno, but almost no one has the time to champion a migration when it just doesn’t have that many benefits.

We inherited a 10+ year old production system with node and react; it made by a succesful company that made it with vc money in a short time and then got acquired; the system has grown to 100s of 1000s of lines of js (no ts). It runs on a cluster of VPSs on ancient versions of everything.

It took me 3 days to rewrite it to typescript and deno with zero vulns by prompting cerebras glm 4.7 with basically 'port this to modern ts, drizzle and deno' and then opus in claude code to make it work and fix it. It uses playwright mcp to test all flows; it runs production now instead of the old version; no issues so far.

Also, the 3rd day was only on writing REST and Playwright tests on both versions so we could compare if everything works the same.