instantiateWasmBindgen without the wait: compiles and instantiates on the calling thread and returns the exports at once.
For Node and workers, where a module can be ready before anything synchronous runs. A browser's main thread refuses a synchronous compile of more than a few kilobytes, so there the async form is the only one.
instantiateWasmBindgen without the wait: compiles and instantiates on the calling thread and returns the exports at once.