TypeError: this.emit is not a function
at WebSocket.socket.on (/Users/zhangkui/.fie/node_modules/_koa-websocket@2.1.0@koa-websocket/index.js:25:10)
at emitOne (events.js:116:13)
at WebSocket.emit (events.js:211:7)
at Receiver.onerror (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/WebSocket.js:876:10)
at Receiver.error (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:321:10)
at Receiver.maxPayloadExceeded (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:389:8)
at Receiver. (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:479:20)
at Receiver.add (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:103:24)
at Socket.realHandler (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/WebSocket.js:825:20)
at emitOne (events.js:116:13)
at Socket.emit (events.js:211:7)
at addChunk (_stream_readable.js:263:12)
at readableAddChunk (_stream_readable.js:250:11)
at Socket.Readable.push (_stream_readable.js:208:10)
at TCP.onread (net.js:594:20)
TypeError: this.emit is not a function at WebSocket.socket.on (/Users/zhangkui/.fie/node_modules/_koa-websocket@2.1.0@koa-websocket/index.js:25:10) at emitOne (events.js:116:13) at WebSocket.emit (events.js:211:7) at Receiver.onerror (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/WebSocket.js:876:10) at Receiver.error (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:321:10) at Receiver.maxPayloadExceeded (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:389:8) at Receiver. (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:479:20)
at Receiver.add (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/Receiver.js:103:24)
at Socket.realHandler (/Users/zhangkui/.fie/node_modules/_ws@1.1.5@ws/lib/WebSocket.js:825:20)
at emitOne (events.js:116:13)
at Socket.emit (events.js:211:7)
at addChunk (_stream_readable.js:263:12)
at readableAddChunk (_stream_readable.js:250:11)
at Socket.Readable.push (_stream_readable.js:208:10)
at TCP.onread (net.js:594:20)