Initial commit: add .gitignore and README

packages/shared-utils/src/validation.ts

@@ -0,0 +1,49 @@
+/**
+ * Validation utility functions
+ */
+
+/**
+ * Check if value is empty
+ */
+export function isEmpty(value: unknown): boolean {
+  if (value === null || value === undefined) return true;
+  if (typeof value === 'string') return value.trim().length === 0;
+  if (Array.isArray(value)) return value.length === 0;
+  if (typeof value === 'object') return Object.keys(value).length === 0;
+  return false;
+}
+
+/**
+ * Check if value is not empty
+ */
+export function isNotEmpty(value: unknown): boolean {
+  return !isEmpty(value);
+}
+
+/**
+ * Check if email is valid
+ */
+export function isValidEmail(email: string): boolean {
+  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+  return emailRegex.test(email);
+}
+
+/**
+ * Check if URL is valid
+ */
+export function isValidUrl(url: string): boolean {
+  try {
+    new URL(url);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Check if string is numeric
+ */
+export function isNumeric(str: string): boolean {
+  return !isNaN(Number(str)) && !isNaN(parseFloat(str));
+}
+