[no_wizard]

Not to be pedantic, but its not a modified Node.js runtime, it is a wholly custom runtime based on V8 directly. They're working on some Node.js API compatibility, but its not at all Node.js[0]

To quote directly:

Cloudflare Workers, however, run directly on V8. There are a few reasons for this. One reason is speed of execution for functions that have not been used recently. Cold starts are an issue in serverless computing, but running functions on V8 means that the functions can be 'spun up' and executed, typically, within 5 milliseconds or less. (Node.js has more overhead and usually takes a few milliseconds longer.) Another reason is that V8 sandboxes JavaScript functions automatically, which increases security.

[0]: https://www.cloudflare.com/learning/serverless/glossary/what...