Initial

resources/app/node_modules/@smithy/util-endpoints/dist-es/lib/isValidHostLabel.js

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+const VALID_HOST_LABEL_REGEX = new RegExp(`^(?!.*-$)(?!-)[a-zA-Z0-9-]{1,63}$`);
+export const isValidHostLabel = (value, allowSubDomains = false) => {
+    if (!allowSubDomains) {
+        return VALID_HOST_LABEL_REGEX.test(value);
+    }
+    const labels = value.split(".");
+    for (const label of labels) {
+        if (!isValidHostLabel(label)) {
+            return false;
+        }
+    }
+    return true;
+};