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events.js:287
      throw er; // Unhandled 'error' event
      ^

Error: Access denied for user ''@'localhost' (using password: NO)
    at Packet.asError (C:\Users\cmos\node_modules\mysql2\lib\packets\packet.js:712:17)
    at ClientHandshake.execute (C:\Users\cmos\node_modules\mysql2\lib\commands\command.js:28:26)
    at Connection.handlePacket (C:\Users\cmos\node_modules\mysql2\lib\connection.js:417:32)
    at PacketParser.onPacket (C:\Users\cmos\node_modules\mysql2\lib\connection.js:75:12)
    at PacketParser.executeStart (C:\Users\cmos\node_modules\mysql2\lib\packet_parser.js:75:16)
    at Socket.<anonymous> (C:\Users\cmos\node_modules\mysql2\lib\connection.js:82:25)
    at Socket.emit (events.js:310:20)
    at addChunk (_stream_readable.js:286:12)
    at readableAddChunk (_stream_readable.js:268:9)
    at Socket.Readable.push (_stream_readable.js:209:10)
Emitted 'error' event on Connection instance at:
    at Connection._notifyError (C:\Users\cmos\node_modules\mysql2\lib\connection.js:221:12)
    at ClientHandshake.<anonymous> (C:\Users\cmos\node_modules\mysql2\lib\connection.js:114:14)
    at ClientHandshake.emit (events.js:322:22)
    at ClientHandshake.execute (C:\Users\cmos\node_modules\mysql2\lib\commands\command.js:33:14)
    at Connection.handlePacket (C:\Users\cmos\node_modules\mysql2\lib\connection.js:417:32)
    [... lines matching original stack trace ...]
    at addChunk (_stream_readable.js:286:12) {
  code: 'ER_ACCESS_DENIED_ERROR',
  errno: 1045,
  sqlState: '28000',
  sqlMessage: "Access denied for user ''@'localhost' (using password: NO)"
}