I love “Discourse”! It’s perfect software.
I need editor like it in the discourse for my local mediawiki.
How-to do it? 
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Just copy over the relevant pieces you need from https://github.com/discourse/discourse.
Which pieces to copy is left as an exercise to the reader. 
My guess is that it would take me 3 to 12 months if I quit my job.
Just have a look at https://emberjs.com/.
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