Polymer Local Storage demo app

This app demoes an issue with the WebComponents polyfill introduced in the version 1.0.8. The issue causes the app to fail in IE11. Most likely, the root cause is closure-compiler/#2640, but for some reason the issue did not surface with the polyfill versions 1.0.7 and before.

Run the demo locally

First, make sure you have Node and Yarn installed. Then clone the repo and run yarn install to get all dependencies loaded.

Build the application with yarn build and then start with yarn start. The app will start at http://localhost:8081.

Check the online demo

The online demo is deployed to this repo's GitHub pages: https://vlukashov.github.io/polymer-local-storage/.

Issue details

When viewing the app in Internet Explorer 11, it fails to load at Polymer.AppStorageBehavior._enqueueTransaction:

return this.__transactionQueueAdvances = this.__transactionQueueAdvances.then(transaction).catch(function (error) {
  this._error('Error performing queued transaction.', error);
}.bind(this));

The error in console says: Object doesn't support property or method 'catch'.

Workaround

Pin the version of the WebComponents polyfill to 1.0.7 or below.