Persistent Deprecation Warning on Ember 3.28

[sdellisImpinj]

After upgrading to Ember 3.28, I start to see this whenever I build the app:

DEPRECATION: registerPlugin is deprecated, please pass plugins directly via compileand/orprecompile. [deprecation id: template-compiler.registerPlugin]

This appears to be due to ember-maybe-in-element (which is a dependency of ember-basic-dropdown) not updating their version of ember-cli-htmlbars:
DockYard/ember-maybe-in-element#47

Since ember-maybe-in-element hasn't been touched since May, 2021 I filed an issue with ember-basic-dropdown to hopefully get it fixed on their end (by not using ember-maybe-in-element, which only provides a small convenience):
cibernox/ember-basic-dropdown#640

My hope with filing this issue here is to track this and hopefully get ember-power-select updated with a hypothetical future version of ember-basic-dropdown so that it won't block me folks from migrating to Ember 4.0 (since this deprecation warning will turn into a proper error at that point).

[villander]

I have an issue with the Ember 3.28 #1498 complaining about duplication of ember-cli-htmlbars

[raido]

For me deduplication of packages solved it - DockYard/ember-maybe-in-element#47 (comment)

[cibernox]

What's the fix for this? Update ember-cli-htmlbars? If so, to what version?

[sdellisImpinj]

Updating to the latest version of ember-power-select and running radio's deduplication suggestion resolved this for me.