Upgrade to Polymer v1.2 about declarativewidgets

[peller]

There's ES6 Maps and Sets

[lbustelo]

There is another issue from elements getting updated to follow Polymer 1.2

chrome 46                ✖ elements/urth-viz-chart/test/urth-viz-chart.html » "before each" hook

  Polymer.dom(...).observeNodes is not a function
    <unknown> at     paper-input-container.Polymer.attached at /elements/paper-input/paper-input-container.html:461:0
    <unknown> at   paper-input-container.Polymer.Base._addFeature._invokeBehavior at /elements/polymer/polymer-micro.html:356:0
    <unknown> at   paper-input-container.Polymer.Base._addFeature._doBehavior at /elements/polymer/polymer-micro.html:351:0
    <unknown> at          paper-input-container.<anonymous> at /elements/polymer/polymer-micro.html:156:0
    <unknown> at      Object.Polymer.RenderStatus.whenReady at /elements/polymer/polymer-micro.html:109:0
    <unknown> at   paper-input-container.Polymer.Base.attachedCallback at /elements/polymer/polymer-micro.html:154:0
    <unknown> at   paper-input-container.Polymer.Base._addFeature.attachedCallback at /elements/polymer/polymer-mini.html:96:0
    <unknown> at   test-fixture.TestFixtureExtension.createFrom at /elements/test-fixture/test-fixture.html:70:0
    <unknown> at                   test-fixture.<anonymous> at /elements/test-fixture/test-fixture.html:38:0```

[lbustelo]

We are not on Polymer 1.2. Staying on 1.1.x was not working.
/cc @jhpedemonte @parente @Lull3rSkat3r

[parente]

We are not on Polymer 1.2.

OK

Staying on 1.1.x was not working.

So ... what are you on?

[lbustelo]

It's late man... We are on 1.2

[parente]

No more bugs for you! :)