fix(db): share registry across bundled copies

packages/db/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@wrnexus/db",
-  "version": "0.8.12",
+  "version": "0.8.13",
   "private": true,
   "type": "module",
   "main": "./src/index.ts",

packages/db/src/client.ts

@@ -14,7 +14,18 @@ import type { Db } from "./driver.ts";
 const DEFAULT = "default";
 type DbFactory = () => Db;
 type RegistryEntry = { db?: Db; factory?: DbFactory };
-const registry = new Map<string, RegistryEntry>();
+const REGISTRY_KEY = Symbol.for("@wrnexus/db:registry:v1");
+type RegistryGlobal = typeof globalThis & { [REGISTRY_KEY]?: Map<string, RegistryEntry> };
+
+// Production bundlers can include @wrnexus/db more than once when an app and
+// the server runtime resolve compatible but distinct package installations.
+// A module-local Map splits configuration from consumers in that case. Store
+// the registry on globalThis under a stable symbol so every bundled copy in
+// the process observes the same default and named connections.
+function databaseRegistry(): Map<string, RegistryEntry> {
+  const scope = globalThis as RegistryGlobal;
+  return (scope[REGISTRY_KEY] ??= new Map<string, RegistryEntry>());
+}
 
 /** Set the default database (called by the runtime at startup). */
 export function setDb(db: Db): Db;
@@ -23,7 +34,7 @@ export function setDb(name: string, db: Db): Db;
 export function setDb(a: string | Db, b?: Db): Db {
   const name = typeof a === "string" ? a : DEFAULT;
   const db = typeof a === "string" ? b! : a;
-  registry.set(name, { db });
+  databaseRegistry().set(name, { db });
   return db;
 }
 
@@ -37,12 +48,12 @@ export function registerDb(name: string, db: Db): Db {
  * `getDb(name)` call creates and caches the connection.
  */
 export function registerLazyDb(name: string, factory: DbFactory): void {
-  registry.set(name, { factory });
+  databaseRegistry().set(name, { factory });
 }
 
 /** The default database, or a named one. Throws if it isn't configured. */
 export function getDb(name = DEFAULT): Db {
-  const entry = registry.get(name);
+  const entry = databaseRegistry().get(name);
   if (!entry) {
     throw new Error(
       name === DEFAULT
@@ -60,16 +71,17 @@ export function getDb(name = DEFAULT): Db {
 
 /** Whether the default (or a named) database has been configured. */
 export function hasDb(name = DEFAULT): boolean {
-  return registry.has(name);
+  return databaseRegistry().has(name);
 }
 
 /** Names of all configured databases (the default appears as "default"). */
 export function databaseNames(): string[] {
-  return [...registry.keys()];
+  return [...databaseRegistry().keys()];
 }
 
 /** Close every configured database and clear the registry. */
 export async function closeDatabases(): Promise<void> {
+  const registry = databaseRegistry();
   const databases = [...registry.values()].flatMap((entry) => (entry.db ? [entry.db] : []));
   registry.clear();
   const results = await Promise.allSettled(databases.map((db) => db.close()));

packages/db/test/registry.test.ts

@@ -92,3 +92,16 @@ test("registry closes every database and clears itself when one close fails", as
   expect(secondClosed).toBe(true);
   expect(databaseNames()).toEqual([]);
 });
+
+test("separately evaluated package copies share the process-wide registry", async () => {
+  await closeDatabases();
+  const secondCopy = await import(`../src/client.ts?copy=${crypto.randomUUID()}`);
+  const main = createDb(sqlite(":memory:"));
+
+  setDb(main);
+  expect(secondCopy.hasDb()).toBe(true);
+  expect(secondCopy.getDb()).toBe(main);
+
+  await secondCopy.closeDatabases();
+  expect(hasDb()).toBe(false);
+});