Eris react to role bot (using https://github.com/abalabahaha/eris/). Gives the Guild Discord role when reacting (removes the role if you already had the role).

bot.js

var emojiToRole = {
    '❤️': '730969029392597014',
    '🧡': '550097270906028042',
    '💛': '730970455158292582',
    '💚': '730970493527654531',
    '💙': '526038406182993941',
    '💜': '541054776440520744',
    '🖤': '730970538335404033',
    '🤍': '730982363605237800',
}
var emojiRoles = new Set(Object.values(emojiToRole))
var rolesMessageId = '730980512746962975'

var updateRoles = function (message, emoji, userID) {
    if (message.id == rolesMessageId) {
        var guild = message.channel.guild
        guild.fetchMembers({
            userIDs: [userID],
            limit: 1
        }).then(members => {
            var member = members[0]

            // Find previous role and remove all related roles
            var newRoles = member.roles.filter(function(el) {
                return !emojiRoles.has(el)
            })

            // Add the new role if it didn't have it before
            var newRole = emojiToRole[emoji.name];
            if (!member.roles.includes(newRole)) {
                newRoles.push(newRole)
            }
            guild.editMember(userID, {
                roles: newRoles
            })
        })
    }
};

bot.on('messageReactionAdd', updateRoles)
bot.on('messageReactionRemove', updateRoles)