The recent version of the wasm-bindgen bundler output does not use cyclic imports between wasm and js.

For this non-cyclic version to work, both index_bg.js and index_bg.wasm need to be externalized since otherwise a dual package hazard on index_bg.js would make it non-functional.

The code is copied from https://github.com/rustwasm/wasm-bindgen/tree/8198d2d25920e1f4fc593e9f8eb9d199e004d731/examples/hello_world

npm i
npm run build
# then
# 1. copy `examples/hello_world/pkg` to this directory
# 2. add { "type": "module" } to `package.json`
#    (this will be automatically included after https://github.com/rustwasm/wasm-pack/pull/1061)