Allow proper promise failure (#316)

* Allow proper promise failure

* Remove unneeded dep

packages/util-crypto/package.json

@@ -29,7 +29,6 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/util-crypto#readme",
   "dependencies": {
     "@babel/runtime": "^7.3.1",
-    "@parity/schnorrkel-js": "^0.1.2",
     "@polkadot/util": "^0.34.16",
     "@types/bip39": "^2.4.2",
     "@types/webassembly-js-api": "^0.0.2",

packages/util-crypto/src/schnorrkel/schnorrkel-js/schnorrkel_js.js

@@ -258,7 +258,6 @@ const createPromise = require('./schnorrkel_js_bg');
 const wasmPromise = createPromise(wasmImports);
 
 module.exports.isReady = function () { return !!wasm; }
-module.exports.waitReady = function () { return wasmPromise.then(() => true); }
-
-wasmPromise.then((_wasm) => { wasm = _wasm });
+module.exports.waitReady = function () { return wasmPromise.then(() => !!wasm); }
 
+wasmPromise.then((_wasm) => { wasm = _wasm }).catch(() => {});

packages/util-crypto/src/schnorrkel/schnorrkel-js/schnorrkel_js_bg.js

@@ -1,7 +1,7 @@
 
 const bytes = require('./schnorrkel_js_wasm');
 
-module.exports = function createExportPromise (wasmImports) {
+module.exports = async function createExportPromise (wasmImports) {
   const imports = {
     './schnorrkel_js': wasmImports
   };