refactor(src): split oversized modules

src/infra/state-migrations.fs.ts

@@ -0,0 +1,58 @@
+import fs from "node:fs";
+
+import JSON5 from "json5";
+
+export type SessionEntryLike = {
+  sessionId?: string;
+  updatedAt?: number;
+} & Record<string, unknown>;
+
+export function safeReadDir(dir: string): fs.Dirent[] {
+  try {
+    return fs.readdirSync(dir, { withFileTypes: true });
+  } catch {
+    return [];
+  }
+}
+
+export function existsDir(dir: string): boolean {
+  try {
+    return fs.existsSync(dir) && fs.statSync(dir).isDirectory();
+  } catch {
+    return false;
+  }
+}
+
+export function ensureDir(dir: string) {
+  fs.mkdirSync(dir, { recursive: true });
+}
+
+export function fileExists(p: string): boolean {
+  try {
+    return fs.existsSync(p) && fs.statSync(p).isFile();
+  } catch {
+    return false;
+  }
+}
+
+export function isLegacyWhatsAppAuthFile(name: string): boolean {
+  if (name === "creds.json" || name === "creds.json.bak") return true;
+  if (!name.endsWith(".json")) return false;
+  return /^(app-state-sync|session|sender-key|pre-key)-/.test(name);
+}
+
+export function readSessionStoreJson5(storePath: string): {
+  store: Record<string, SessionEntryLike>;
+  ok: boolean;
+} {
+  try {
+    const raw = fs.readFileSync(storePath, "utf-8");
+    const parsed = JSON5.parse(raw);
+    if (parsed && typeof parsed === "object") {
+      return { store: parsed as Record<string, SessionEntryLike>, ok: true };
+    }
+  } catch {
+    // ignore
+  }
+  return { store: {}, ok: false };
+}