type checker no trust functions as type guards
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@ -385,7 +385,7 @@ function getIpFromRequest(req) {
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let clientIp = req.connection.remoteAddress;
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let ip = ipaddr.parse(clientIp);
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// Check if the IP address is IPv4-mapped IPv6 address
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if (ip.kind() === 'ipv6' && ip.isIPv4MappedAddress()) {
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if (ip.kind() === 'ipv6' && ip instanceof ipaddr.IPv6 && ip.isIPv4MappedAddress()) {
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const ipv4 = ip.toIPv4Address().toString();
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clientIp = ipv4;
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} else {
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