Use alternatives to .find() because that's not polyfilled

lib/Client/Resolver/Resolver.js

@@ -155,9 +155,7 @@ var Resolver = (function () {
 
 				var server = _ref;
 
-				if (role = server.roles.find(function (r) {
+				if (role = server.roles.get("id", resource)) {
-					return r.id == resource;
-				})) {
 					return role;
 				}
 			}

lib/Structures/Message.js

@@ -49,9 +49,15 @@ var Message = (function (_Equality) {
 		this.everyoneMentioned = data.mention_everyone || data.everyoneMentioned;
 		this.id = data.id;
 
-		if (data.edited_timestamp) this.editedTimestamp = Date.parse(data.edited_timestamp);
+		if (data.edited_timestamp) {
+			this.editedTimestamp = Date.parse(data.edited_timestamp);
+		}
 
-		if (data.author instanceof _User2["default"]) this.author = data.author;else this.author = client.internal.users.add(new _User2["default"](data.author, client));
+		if (data.author instanceof _User2["default"]) {
+			this.author = data.author;
+		} else {
+			this.author = client.internal.users.add(new _User2["default"](data.author, client));
+		}
 
 		this.content = data.content;
 
@@ -63,15 +69,38 @@ var Message = (function (_Equality) {
 			// this is .add and not .get because it allows the bot to cache
 			// users from messages from logs who may have left the server and were
 			// not previously cached.
-			if (mention instanceof _User2["default"]) _this.mentions.push(mention);else _this.mentions.push(client.internal.users.add(new _User2["default"](mention, client)));
+			if (mention instanceof _User2["default"]) {
+				_this.mentions.push(mention);
+			} else {
+				_this.mentions.push(client.internal.users.add(new _User2["default"](mention, client)));
+			}
 		});
 	}
 
 	Message.prototype.isMentioned = function isMentioned(user) {
 		user = this.client.internal.resolver.resolveUser(user);
-		return !!(user && this.mentions.find(function (m) {
+		if (!user) {
-			return m.id == user.id;
+			return false;
-		}));
+		}
+		for (var _iterator = this.mentions, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
+			var _ref;
+
+			if (_isArray) {
+				if (_i >= _iterator.length) break;
+				_ref = _iterator[_i++];
+			} else {
+				_i = _iterator.next();
+				if (_i.done) break;
+				_ref = _i.value;
+			}
+
+			var mention = _ref;
+
+			if (mention.id == user.id) {
+				return true;
+			}
+		}
+		return false;
 	};
 
 	Message.prototype.toString = function toString() {

src/Client/Resolver/Resolver.js

@@ -97,7 +97,7 @@ export default class Resolver {
 		if (resource instanceof String || typeof resource === "string") {
 			var role = null;
 			for (var server of this.internal.servers) {
-				if (role = server.roles.find(r => r.id == resource)) {
+				if (role = server.roles.get("id", resource)) {
 					return role;
 				}
 			}

src/Structures/Message.js

@@ -24,13 +24,15 @@ export default class Message extends Equality{
 		this.everyoneMentioned = data.mention_everyone || data.everyoneMentioned;
 		this.id = data.id;
 
-		if(data.edited_timestamp)
+		if(data.edited_timestamp) {
 			this.editedTimestamp = Date.parse(data.edited_timestamp);
+		}
 
-		if(data.author instanceof User)
+		if(data.author instanceof User) {
 			this.author = data.author;
-		else
+		} else {
 			this.author = client.internal.users.add(new User(data.author, client));
+		}
 
 		this.content = data.content;
 
@@ -42,10 +44,11 @@ export default class Message extends Equality{
 			// this is .add and not .get because it allows the bot to cache
 			// users from messages from logs who may have left the server and were
 			// not previously cached.
-			if(mention instanceof User)
+			if(mention instanceof User) {
 				this.mentions.push(mention);
-			else
+			} else {
 				this.mentions.push(client.internal.users.add(new User(mention, client)));
+			}
 		});
 	}
 
@@ -55,7 +58,15 @@ export default class Message extends Equality{
 
 	isMentioned(user){
 		user = this.client.internal.resolver.resolveUser(user);
-		return !!(user && this.mentions.find(m => m.id == user.id));
+		if (!user) {
+			return false
+		}
+		for (var mention of this.mentions) {
+			if (mention.id == user.id) {
+				return true;
+			}
+		}
+		return false;
 	}
 
 	toString(){