I have a Wordpress site using ACF, where several TinyMCE instances may be loaded. I want to be able to hook into these with javascript but am unable to find any documentation on how to do so. In TinyMCE 3 there seems to be a oninit method which you can use, but I can't find any information about such a method in version 4. I'm searching for the equivalent of this: https://www.tiny.cloud/docs-3x/reference/configuration/Configuration3x@oninit/

I am not the one instantiating the editors so I can't define the setup, but have to use some callback method I guess. The aim is to modify some markup that is generated when clicking a button in the editor toolbar.

Does anyone know how to do this?

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