regression: Promise.prototype.catch is undefined in IE11 (v1.0.8+)

[vlukashov]

Starting from the version 1.0.8 of the WebComponents polyfill, the ES6 promise polyfill shipped as a part of webcomponents-lite.js does not define the Promise.prototype.catch method. For example, the app-storage web components break the app in IE11 starting with WebComponents polyfill 1.0.8 (1.0.7 is still OK).

Here is a demo app (broken in IE11): https://github.com/vlukashov/polymer-local-storage.

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.

Workaround
Pin the version of the WebComponents polyfill to 1.0.7 or less.

[ChadKillingsworth]

@azakus Looks like you probably need to manually assign the es6-promise Promise object to window.Promise rather than depend on the auto registration.

Alternatively, just remove the rewrite_polyfills=false flag for this case and use the Compiler provided promise polyfill.