Probot app to delete 👍 and single emoji comments.

delete-comment.js

// :+1: comments and single emoji
const pattern = /^\W*(:[\w-\+]+:|[\uE000-\uF8FF]|\uD83C[\uDF00-\uDFFF]|\uD83D[\uDC00-\uDDFF])\W*$/g;

module.exports = robot => {
  robot.on('issue_comment.created', context => {
    if(context.payload.comment.body.match(pattern)) {
      context.github.issues.deleteComment(context.issue());
    }
  })
}