Deprecation warning 'template-compiler.registerPlugin' does not provide a lot of information

[spuxx1701]

The following deprecation warning does not give me any information about what plugin is causing it.

Deprecation ID: template-compiler.registerPlugin
This is the console output:
https://deprecations.emberjs.com/v3.x/#toc_template-compiler-registerPlugin

| building... [Babel: ember-popper > applyPatches]
DEPRECATION: Using class based template compilation plugins is deprecated, please update to the functional style: SetTransform [deprecation id: template-compiler.registerPlugin]
        at logDeprecationStackTrace (C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:1984:21)
        at HANDLERS.<computed> (C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:2117:9)
        at raiseOnDeprecation (C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:2011:9)
        at HANDLERS.<computed> (C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:2117:9)
        at invoke (C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:2129:9)
        at deprecate (C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:2085:28)
        at wrapLegacyPluginIfNeeded (C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:20501:49)
        at C:\<my-project>\node_modules\ember-source\dist\ember-template-compiler.js:20482:16
        at Array.map (<anonymous>)

Maybe adding information required to find the plugin would be beneficial?

ember-cli: 3.28.4
ember-source: 3.28.8

[boris-petrov]

I believe it is coming from ember-box.

[bertdeblock]

This deprecation warning comes from ember-source, so maybe it's better if we move this issue to the Ember.js repo?

[cah-brian-gantzler]

I have the same issue but from discord I believe I have tracked mine down to ember-tooltips/ember-in-element-polyfill. Which is weird because Im on a high enough ember the polyfill is inert, but the check must be happening anyway.

What I was hoping for here was the solution to quick the noise til a fix can be made (assume moving to ember 4 will quiet it as well, just not there yet)

[gnclmorais]

Did emberjs/ember.js#19704 perhaps address this deprecation?

[bertdeblock]

I think the issue reported here is, that it's not clear which plugin is triggering this deprecation.
Though, the deprecation message does include the name of the plugin, being SetTransform.
A quick code search with SetTransform on emberobserver.com only returns a handful of addons, one of them being ember-box as mentioned here #9738 (comment), but it could also be that it's coming from one of the other addons that have a transform plugin (just check which ones you are using). I think the SetTransform name has just been copied from one addon to the other. Those addons are all from the same author.
I still think this issue should be closed here though, it's not an ember-cli issue.

[bertdeblock]

I'm going to close this one if that's okay.
The deprecation does contain the name of the offending plugin (in this case: SetTransform) and is triggered by ember-source, not by ember-cli. I've also made ember-learn/deprecation-app#1129 to update the docs for this deprecation, so hopefully, it will be clearer for people running into this.