window.__shady_native_addEventListener is not a function in versions of Chrome and Firefox

[rattai]

Description

Simply trying to load the webcomponents polyfills in Firefox 30 throws this error: TypeError: window.__shady_native_addEventListener is not a function

Since windows.EventTarget exists in FF30, this if-check results in __shady_native_addEventListener not getting set on window. However, there are attempts to call it subsequently.

Live Demo

https://jsbin.com/gajugarere/1/edit?html,console,output

Steps to Reproduce

1. Try to load webcomponents polyfills in Firefox 30.

Expected Results

Polyfills load without error.

Actual Results

Error is thrown and polyfills fail.

Browsers Affected

• [x] Chrome
• [x] Firefox
• [ ] Edge
• [ ] Safari 9
• [ ] Safari 8
• [ ] IE 11

Versions

• webcomponents: v2.4.2

[romainmenke]

We see the same in these browsers :

Some of these user agents might not be honest.

Browser Versions	Browser Name
31.0.0	Firefox
53.0.0	Firefox
54.0.0	Firefox
55.0.0	Firefox
56.0.0	Firefox
59.0.3074	Chrome
59.0.3076	Chrome
59.0.3090	Chrome
59.0.3096	Chrome
59.0.3101	Chrome
60.0.3149	Chrome
60.0.3152	Chrome
61.0.3164	Chrome
61.0.3170	Chrome
61.0.3178	Chrome
61.0.3185	Chrome
62.0.3190	Chrome
62.0.3193	Chrome

[aomarks]

Sounds possibly related to #298

[matthias-ccri]

Also seeing this in Firefox 31.6 ESR.

[devalexqt]

firefox 52 no luck!

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[romainmenke]

Not state, repo needs more attention

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[romainmenke]

still not stale, I wished this bot didn't exist.