wasm-bindgen/examples/hello_world/chrome/index.js

// Note that unlike the directory above this we don't need to use an
// asynchronous `import` statement as we're just working with JS here so we can
// use normal `import { ... }` statements.
//
// Unlike before however we have to *also* import the JS file itself containing
// wasm (generated by wasm2es6js) which has a `booted` promise to let us know
// when it's ready to go.
import { greet } from './hello_world';
import { booted } from './hello_world_bg';

booted.then(() => greet("World!"));