fixes for command arguments

src/commands/ban.ts

@@ -15,6 +15,7 @@ export default class Ban extends Command {
 
   public async run(message: Message, args: string[]) {
     try {
+      if (!args[0]) return this.client.commands.get('help').run(message, [this.name]);
       const member = this.client.util.resolveMember(args[0], this.client.guilds.get(this.client.config.guildID));
       let user: User;
       if (!member) {

src/commands/npm.ts

@@ -15,7 +15,7 @@ export default class NPM extends Command {
 
   public async run(message: Message, args: string[]) {
     try {
-      if (!args[0]) return this.error(message.channel, 'You need to specify a module name.');
+      if (!args[0]) return this.client.commands.get('help').run(message, [this.name]);
 
       const res = await axios.get(`https://registry.npmjs.com/${args[0]}`, { validateStatus: (_) => true });
 

src/commands/roleinfo.ts

@@ -15,7 +15,7 @@ export default class Roleinfo extends Command {
 
   public async run(message: Message, args: string[]) {
     try {
-      if (!args[0]) return this.error(message.channel, 'You need to specify a role ID or a role name.');
+      if (!args[0]) return this.client.commands.get('help').run(message, [this.name]);
 
       let role: Role = this.client.guilds.get(this.client.config.guildID).roles.find((r: Role) => r.id === args[0]);
       if (!role) { // if it's a role name

src/commands/unban.ts

@@ -14,6 +14,7 @@ export default class Unban extends Command {
 
   public async run(message: Message, args: string[]) {
     try {
+      if (!args[0]) return this.client.commands.get('help').run(message, [this.name]);
       let user: User;
       try {
         user = await this.client.getRESTUser(args[0]);