You should see a console message saying it is deprecated.
I haven’t tested this, but I think this is close to what you’d want.
Create a file at /assets/javascripts/lib/discourse-markdown/pirate-speak.js.es6
import { registerOption } from 'pretty-text/pretty-text';
registerOption((siteSettings, opts) => {
opts.features['pirate-speak'] = true;
});
function piratize (text) {
return text.replace(/\b(am|are|is)\b/ig, "be")
.replace(/ing\b/ig, "in'")
.replace(/v/ig, "'");
}
export function setup(helper) {
helper.postProcessText(function (text) {
text = [].concat(text);
for (var i = 0; i < text.length; i++) {
if (text[i].length > 0 && text[i][0] !== "<") {
text[i] = piratize(text[i]);
}
}
return text;
});
}
I haven’t actually tested this, but it should at least put you on the right track.
You can find more about the dialect helper at
https://github.com/discourse/discourse/blob/master/app/assets/javascripts/pretty-text/engines/discourse-markdown.js.es6