RocketChat/Rocket.Chat

import type { Meteor } from 'meteor/meteor';

import { slashCommands } from '../../utils/client/slashCommand';

slashCommands.add({
    command: 'join',
    options: {
        description: 'Join_the_given_channel',
        params: '#channel',
        permission: 'view-c-room',
    },
    result(err, _result: unknown, params: Record<string, any>) {
        if ((err as Meteor.Error).error === 'error-user-already-in-room') {
            params.cmd = 'open';
            params.msg.msg = params.msg.msg.replace('join', 'open');
            return void slashCommands.run({ command: 'open', params: params.params, message: params.msg, triggerId: '', userId: params.userId });
        }
    },
});