showdown-callout.js

(function(extension) {
  if (typeof showdown !== 'undefined') {
    // global (browser or nodejs global)
    extension(showdown);
  } else if (typeof define === 'function' && define.amd) {
    // AMD
    define(['showdown'], extension);
  } else if (typeof exports === 'object') {
    // Node, CommonJS-like
    module.exports = extension(require('showdown'));
  } else {
    // showdown was not found so we throw
    throw Error('Could not find showdown library');
  }
}(function(showdown) {
  showdown.extension('callout', function() {
    return [{
      type: 'lang',
      regex: '```callout-important(.*)```',
      replace: '<div class="callout callout-important">$1</div>'
    }]
  })
}));