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/subdomain.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 vanilla/node_modules/tldts-core/src/subdomain.ts

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

diff --git a/vanilla/node_modules/tldts-core/src/subdomain.ts b/vanilla/node_modules/tldts-core/src/subdomain.ts
new file mode 100644
index 0000000..bbb9c97
--- /dev/null
+++ b/vanilla/node_modules/tldts-core/src/subdomain.ts
@@ -0,0 +1,11 @@
+/**
+ * Returns the subdomain of a hostname string
+ */
+export default function getSubdomain(hostname: string, domain: string): string {
+  // If `hostname` and `domain` are the same, then there is no sub-domain
+  if (domain.length === hostname.length) {
+    return '';
+  }
+
+  return hostname.slice(0, -domain.length - 1);
+}
-- 
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