.ready is not resolved or rejected in WebWorker when using Edge

[webmaster128]

Steps to reproduce:

1. git clone https://github.com/webmaster128/webpack-minimal.git
2. checkout branch libsodiumjs-webworker (contains an unminified hackable libsodium.js and libsodium-wrappers.js)
3. yarn install
4. yarn build
5. yarn start
6. open browser at http://localhost:5000
7. Click button to start WebWorker

Expected: log output contains

[Main thread] waiting for libsodium
[Main thread] libsodium ready
Starting worker …
[Worker] waiting for libsodium
[Worker] libsodium ready

On Edge 16, the output only contains

[Main thread] waiting for libsodium
[Main thread] libsodium ready
Starting worker …
[Worker] waiting for libsodium

When adding the crypto polyfill from @buu700 #46 (comment) (slightly modified to be usable in strict mode) to cryptoworker.js (cryptoworker.js.txt), everything works.

This brings me to two questions:

1. Why is .ready not rejected when crypto is missing?
2. Why is a random number generator required before any libsodium function is called? Maybe I just need some Argon2 and do not need a RNG.

[webmaster128]

This happens because _sodium_init() never returns in

(function(root) {
  function expose_wrappers(exports, libsodiumModule) {
    "use strict";

    var output_format = "uint8array";

    var libsodium;
    var ready = libsodiumModule.ready.then(function() {
      libsodium = libsodiumModule;
      if (libsodium._sodium_init() !== 0) {
        throw new Error("libsodium was not correctly initialized.");
      }
      // ...

[webmaster128]

Arg, unhandled Promise rejections do not throw an error in Edge.

Adding a rejection handler reveals the error:

libsodium.ready
    .then(function(sodium) {
        console.log("[Worker] libsodium ready");
    })
    .catch(function(error) {
        console.log("[Worker] libsodium errored:", error);
    });

leads to

[Worker] libsodium errored: TypeError: Unable to get property 'getRandomValues' of undefined or null reference

which is correct since both window_.crypto and window_.msCrypto are undefined in the worker.

Note to myself: Promise rejections may be silent, depending on the JavaScript environment.