message: js: Implement support for Node.js
  Instead of fetch() with data URI, we use Node-specific Buffer.from API.
  The rest of the code, thankfully, works without changes.
diff: @@ -31,8 +31,10 @@ var MeshoptDecoder = (function() {
  var instance = {};
  var promise =
  - fetch('data:application/octet-stream;base64,' + wasm)
  + (typeof fetch === 'function'
  + ? fetch('data:application/octet-stream;base64,' + wasm)
  .then(response => response.arrayBuffer())
  + : Promise.resolve(Buffer.from(wasm, 'base64').buffer))
  .then(bytes => WebAssembly.instantiate(bytes, imports))
  .then(result => instance = result.instance);
  