Pass errors back to caller

.gitignore

@@ -5,4 +5,5 @@ Thumbs.db
 ehthumbs.db
 Desktop.ini
 $RECYCLE.BIN/
-.DS_Store
+.DS_Store
+package-lock.json

package.json

@@ -78,6 +78,7 @@
         "tiny-uuid": "^1.0.0"
     },
     "jest": {
+        "testURL": "http://localhost",
         "setupFiles": [
             "./tests/jest.setup.js"
         ],

src/store.js

@@ -72,15 +72,15 @@ export class Provider extends React.PureComponent {
             let isFunc = typeof result === 'function'
             if (isFunc) result = result(this.state)
             if (result.then) {
-              return new Promise(res =>
+              return new Promise((res, rej) =>
                 Promise.resolve(result).then(state => {
                   // Update store
                   this.store.state = { ...this.store.state, ...state }
                   // Call subscribers
                   this.store.subscriptions.forEach(callback => callback(state))
                   // Update local state
                   this.setState(state, res)
-                })
+                }).catch(rej)
               )
             } else {
               // Update store in sync