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Create a custom plugin

A plugin is always a function that returns a promise. An async function is an easy way to build one. For example, if you want a plugin that does something silly like replacing strings in some piece of HTML you can do it like this:

async function replaceThings(html: string, route: handledRoute) {
  const replaceStrings = [[':)', '☺']];
  replaceString.forEach(
    (find, replace) => (html = html.split(find).join(replace))
  );
  return html;
}