fix: avoid clashing by ECONNRESET #25
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fix #23
The problem caused by ECONNRESET error of WebSocket connection. When the user move to another tab and hide the preview tab, the preview page will be destroyed. Then the socket emit ECONNRESET error.
Looks like the WebSocket error will be automatically throws if we do not register any error event listener and it causes this problem. So I added an event listener that ignores only ECONNRESET error.
Note
err.codeis valid property of Node.js Error object. https://nodejs.org/api/errors.html#errors_error_code_1