feat: extract code from WS error

src/Utils/generics.ts

@@ -328,4 +328,18 @@ export const getCallStatusFromNode = ({ tag, attrs }: BinaryNode) => {
 	}
 
 	return status
+}
+
+const UNEXPECTED_SERVER_CODE_TEXT = 'Unexpected server response: '
+
+export const getCodeFromWSError = (error: Error) => {
+	let statusCode = 500
+	if(error.message.includes(UNEXPECTED_SERVER_CODE_TEXT)) {
+		const code = +error.message.slice(UNEXPECTED_SERVER_CODE_TEXT.length)
+		if(!Number.isNaN(code) && code >= 400) {
+			statusCode = code
+		}
+	}
+
+	return statusCode
 }