From 76cb9c2a39d477a64824a985ade40507e3bbade1 Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@adammathes.com>
Date: Fri, 13 Feb 2026 21:34:48 -0800
Subject: feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

---
 vanilla/node_modules/tldts-core/src/is-ip.ts | 87 ++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 vanilla/node_modules/tldts-core/src/is-ip.ts

(limited to 'vanilla/node_modules/tldts-core/src/is-ip.ts')

diff --git a/vanilla/node_modules/tldts-core/src/is-ip.ts b/vanilla/node_modules/tldts-core/src/is-ip.ts
new file mode 100644
index 0000000..33151c1
--- /dev/null
+++ b/vanilla/node_modules/tldts-core/src/is-ip.ts
@@ -0,0 +1,87 @@
+/**
+ * Check if a hostname is an IP. You should be aware that this only works
+ * because `hostname` is already garanteed to be a valid hostname!
+ */
+function isProbablyIpv4(hostname: string): boolean {
+  // Cannot be shorted than 1.1.1.1
+  if (hostname.length < 7) {
+    return false;
+  }
+
+  // Cannot be longer than: 255.255.255.255
+  if (hostname.length > 15) {
+    return false;
+  }
+
+  let numberOfDots = 0;
+
+  for (let i = 0; i < hostname.length; i += 1) {
+    const code = hostname.charCodeAt(i);
+
+    if (code === 46 /* '.' */) {
+      numberOfDots += 1;
+    } else if (code < 48 /* '0' */ || code > 57 /* '9' */) {
+      return false;
+    }
+  }
+
+  return (
+    numberOfDots === 3 &&
+    hostname.charCodeAt(0) !== 46 /* '.' */ &&
+    hostname.charCodeAt(hostname.length - 1) !== 46 /* '.' */
+  );
+}
+
+/**
+ * Similar to isProbablyIpv4.
+ */
+function isProbablyIpv6(hostname: string): boolean {
+  if (hostname.length < 3) {
+    return false;
+  }
+
+  let start = hostname.startsWith('[') ? 1 : 0;
+  let end = hostname.length;
+
+  if (hostname[end - 1] === ']') {
+    end -= 1;
+  }
+
+  // We only consider the maximum size of a normal IPV6. Note that this will
+  // fail on so-called "IPv4 mapped IPv6 addresses" but this is a corner-case
+  // and a proper validation library should be used for these.
+  if (end - start > 39) {
+    return false;
+  }
+
+  let hasColon = false;
+
+  for (; start < end; start += 1) {
+    const code = hostname.charCodeAt(start);
+
+    if (code === 58 /* ':' */) {
+      hasColon = true;
+    } else if (
+      !(
+        (
+          (code >= 48 && code <= 57) || // 0-9
+          (code >= 97 && code <= 102) || // a-f
+          (code >= 65 && code <= 90)
+        ) // A-F
+      )
+    ) {
+      return false;
+    }
+  }
+
+  return hasColon;
+}
+
+/**
+ * Check if `hostname` is *probably* a valid ip addr (either ipv6 or ipv4).
+ * This *will not* work on any string. We need `hostname` to be a valid
+ * hostname.
+ */
+export default function isIp(hostname: string): boolean {
+  return isProbablyIpv6(hostname) || isProbablyIpv4(hostname);
+}
-- 
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