Initial commit

Next.js + Express event management app for Hope Family Church.

frontend/src/lib/phone.ts

@@ -0,0 +1,22 @@
+/**
+ * South African phone number utilities (mirrors backend/src/utils/whatsapp.js logic).
+ */
+
+/**
+ * Normalise a raw phone input to the international SA format (27XXXXXXXXX).
+ * Returns null if the input is not a valid SA mobile number.
+ */
+export function normalizeZAPhone(raw: string | null | undefined): string | null {
+  if (!raw) return null;
+  let digits = raw.replace(/\D/g, '');
+  if (digits.startsWith('0') && digits.length === 10) digits = '27' + digits.slice(1);
+  if (/^27\d{9}$/.test(digits)) return digits;
+  return null;
+}
+
+/**
+ * Returns true when the value is a valid SA mobile number (any common format).
+ */
+export function isValidZAPhone(raw: string | null | undefined): boolean {
+  return normalizeZAPhone(raw) !== null;
+}