fix: support duplicate installations

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jest-metadata",
-  "version": "1.0.0-beta.23",
+  "version": "1.0.0",
   "description": "Extend Jest with custom metadata",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/realms/detect.ts

@@ -19,12 +19,25 @@ export function isJestWorker(): boolean {
   return 'JEST_WORKER_ID' in process.env;
 }
 
-export function injectRealmIntoSandbox(sandbox: any, realm: ProcessRealm): void {
+export function injectRealmIntoSandbox(sandbox: any, realm: ProcessRealm): ProcessRealm {
   sandbox.__JEST_METADATA__ = realm;
+  if (sandbox !== globalThis) {
+    sandbox.__JEST_METADATA_SANDBOX__ = true;
+  }
+
+  return realm;
 }
 
 export function getSandboxedRealm(): ProcessRealm | undefined {
-  return (global as any).__JEST_METADATA__;
+  const globalAny = globalThis as any;
+  const realm = globalAny.__JEST_METADATA__;
+  if (realm && !globalAny.__JEST_METADATA_SANDBOX__) {
+    console.warn(
+      '[jest-metadata] Detected duplicate jest-metadata package in the same process. This may lead to unexpected behavior.',
+    );
+  }
+
+  return realm;
 }
 
 export function getServerId(): string | undefined {

src/realms/realm.ts

@@ -1,6 +1,6 @@
 /* eslint-disable @typescript-eslint/no-var-requires,node/no-missing-require */
 // TODO: think about ESM support via dynamic import
-import { getSandboxedRealm, isClient } from './detect';
+import { getSandboxedRealm, injectRealmIntoSandbox, isClient } from './detect';
 import type { ProcessRealm } from './ProcessRealm';
 
 function createRealm(): ProcessRealm {
@@ -13,4 +13,4 @@ function createRealm(): ProcessRealm {
   }
 }
 
-export default getSandboxedRealm() ?? createRealm();
+export default getSandboxedRealm() ?? injectRealmIntoSandbox(globalThis, createRealm());