Add core

packages/medusa/src/helpers/id-map.js

@@ -0,0 +1,17 @@
+import mongoose from "mongoose"
+
+class IdMap {
+  ids = {}
+
+  getId(key) {
+    if (this.ids[key]) {
+      return this.ids[key]
+    }
+    const id = `${mongoose.Types.ObjectId()}`
+    this.ids[key] = id
+    return id
+  }
+}
+
+const instance = new IdMap()
+export default instance