Bundler test suite

[tlively]

Since JS bundlers are a major consumer of this proposal, I wonder if it would be possible to create a shared test suite for bundlers, or whether such a test suite already exists. Obviously the standardization process focuses on test suites for JS/Wasm engines, but in the short term, these are not the most important implementers or consumers of this proposal. What is the state of the art here?

[guybedford]

Sorry for the long delay on this one, I've finally been able to come back to this. I'm working on the RollupJS support at the moment and will include a test suite for that. There are no generic bundler test suites that I know of unfortunately. Tools like Rolldown just port RollupJS's test suite directly. I'll aim to put together a fairly comprehensive test suite for the RollupJS case which should hopefully be easy to port to other tools in a similar way, based on the new jsapi WPT cases landed in https://github.com/WebAssembly/esm-integration/pull/110 (which Node.js is now passing).