I have been testing out Bun w/ Nest JS, and oddly it can run a dev server but can't run my E2E tests (using the Bun test runner). I think this has something to do with Nest's heavy reliance on old-school TS decorators.
We haven't added support for emitDecoratorMetadata yet but we have a branch that does most of the work. It just needs some more tests before we're comfortable merging it