feat: Utils 4개 영역 스캐폴드 추가

Author: SOIV

packages/core/src/utils/date.ts

@@ -0,0 +1,21 @@
+export function formatIsoDate(value: Date): string {
+  return value.toISOString().slice(0, 10);
+}
+
+export function startOfDay(value: Date): Date {
+  const result = new Date(value);
+  result.setHours(0, 0, 0, 0);
+  return result;
+}
+
+export function endOfDay(value: Date): Date {
+  const result = new Date(value);
+  result.setHours(23, 59, 59, 999);
+  return result;
+}
+
+export function addDays(value: Date, days: number): Date {
+  const result = new Date(value);
+  result.setDate(result.getDate() + days);
+  return result;
+}

packages/core/src/utils/encryption.ts

@@ -0,0 +1,19 @@
+function toHex(buffer: ArrayBuffer): string {
+  const bytes = new Uint8Array(buffer);
+  return Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0")).join("");
+}
+
+export async function sha256Hex(value: string): Promise<string> {
+  const encoded = new TextEncoder().encode(value);
+  const digest = await crypto.subtle.digest("SHA-256", encoded);
+  return toHex(digest);
+}
+
+export function maskSecret(value: string, visibleSuffix = 4): string {
+  if (value.length <= visibleSuffix) {
+    return "*".repeat(value.length);
+  }
+
+  const maskedLength = value.length - visibleSuffix;
+  return `${"*".repeat(maskedLength)}${value.slice(-visibleSuffix)}`;
+}

packages/core/src/utils/format.ts

@@ -0,0 +1,14 @@
+export function formatCurrency(amount: number, currency = "USD", locale = "en-US"): string {
+  return new Intl.NumberFormat(locale, {
+    style: "currency",
+    currency,
+    maximumFractionDigits: 2,
+  }).format(amount);
+}
+
+export function formatPercent(value: number, locale = "en-US"): string {
+  return new Intl.NumberFormat(locale, {
+    style: "percent",
+    maximumFractionDigits: 2,
+  }).format(value);
+}

packages/core/src/utils/index.ts

@@ -1,7 +1,4 @@
-export function formatIsoDate(value: Date): string {
-  return value.toISOString().slice(0, 10);
-}
-
-export function isNonEmpty(value: string): boolean {
-  return value.trim().length > 0;
-}
+export * from "./date";
+export * from "./format";
+export * from "./validation";
+export * from "./encryption";

packages/core/src/utils/validation.ts

@@ -0,0 +1,11 @@
+export function isNonEmpty(value: string): boolean {
+  return value.trim().length > 0;
+}
+
+export function isEmail(value: string): boolean {
+  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value);
+}
+
+export function isStrongPassword(value: string): boolean {
+  return /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,}$/.test(value);
+}