Missing error handler on socket

With angular 2 and karma the following means you may be using an import badly. Walk backwards through the changes till your test work again….

moment().utc();  // ERROR
moment.utc();    // Works

Missing error handler on `socket`.
TypeError: (msg || "").replace is not a function
    at C:\projects\current\emes\client-app\node_modules\karma\lib\reporter.js:45:23
    at onBrowserError (C:\projects\current\emes\client-app\node_modules\karma\lib\reporters\base.js:58:60)
    at null.<anonymous> (C:\projects\current\emes\client-app\node_modules\karma\lib\events.js:13:22)
    at emitTwo (events.js:100:13)
    at emit (events.js:185:7)
    at onKarmaError (C:\projects\current\emes\client-app\node_modules\karma\lib\browser.js:95:13)
    at Socket.<anonymous> (C:\projects\current\emes\client-app\node_modules\karma\lib\events.js:13:22)
    at emitOne (events.js:95:20)
    at Socket.emit (events.js:182:7)
    at Socket.onevent (C:\projects\current\emes\client-app\node_modules\karma\node_modules\socket.io\lib\socket.js:335:8)
    at Socket.onpacket (C:\projects\current\emes\client-app\node_modules\karma\node_modules\socket.io\lib\socket.js:295:12)
    at Client.ondecoded (C:\projects\current\emes\client-app\node_modules\karma\node_modules\socket.io\lib\client.js:193:14)
    at Decoder.Emitter.emit (C:\projects\current\emes\client-app\node_modules\karma\node_modules\socket.io\node_modules\socket.io-parser\node_modules\component-emitter\index.js:134:20)
    at Decoder.add (C:\projects\current\emes\client-app\node_modules\karma\node_modules\socket.io\node_modules\socket.io-parser\index.js:247:12)
    at Client.ondata (C:\projects\current\emes\client-app\node_modules\karma\node_modules\socket.io\lib\client.js:175:18)
    at emitOne (events.js:90:13)