Importing WebAssembly modules into WebAssembly modules

[ttraenkler]

How is it possible to break up your WebAssembly module into several modules that import each other similar to ES modules? For example the analogous code in Javascript with ES modules would be sth like this:

a.js: export const a = 3;
b.js: import { a } from './a'

How would that be solved inside the WASM module itself vs. how would that be solved on the Javascript side? Could you sketch some example code how to best approach this problem? Would the result be shipped as a single wasm file or multiple?