sudo npm install mysql --save
npm WARN checkPermissions Missing write access to /root/node_modules/mysql
npm ERR! path /root/node_modules/mysql
npm ERR! code ELOOP
npm ERR! errno -40
npm ERR! syscall access
npm ERR! ELOOP: too many symbolic links encountered, access '/root/node_modules/mysql'
npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2019-02-10T15_31_28_731Z-debug.log
this.socket.off('server-response');
// от определенного
this.socket.off('server-response', listener);