"Realm is not defined" when iterating through Realm Sets using Jest

[sync-by-unito]

I'm getting the error: "ReferenceError: Realm is not defined" when attempting to iterate through a Realm set using Jest.

Realm version: 10.5.0-beta.2 (although I've tested on 10.5.0-beta.1 as well)

Sample unit test:

test("should work with the Set data type", async () => {
    const characterSchema = {
      name: "Character",
      primaryKey: "_id",
      properties: {
        _id: "objectId",
        name: "string",
        levelsCompleted: "int<>",
        inventory: "string<>",
      },
    };
    const realm = await Realm.open({
      schema: [characterSchema],
    });

    let link, hunter;
    realm.write(() => {
      link = realm.create("Character", {
        _id: new BSON.ObjectId(),
        name: "Link",
        inventory: ["elixir", "compass", "glowing shield"],
        levelsCompleted: [4, 9],
      });
      hunter = realm.create("Character", {
        _id: new BSON.ObjectId(),
        name: "Hunter",
        inventory: ["estus flask", "gloves", "rune"],
        levelsCompleted: [1, 2, 5, 24],
      });
    });
    
    hunter.inventory.forEach((inventoryItem) => {
      console.log("The hunter has an inventory item:", inventoryItem);
    });

    realm.write(() => {
      realm.delete(link);
      realm.delete(hunter);
    });
    // close the realm
    realm.close();
  });

Some notes:

• Switching from a forEach loop to an alternative iterator method will still result in the error.
• If you comment out the forEach method in the jest test you will not get the Realm undefined error.
• If this code (minus the jest specific stuff) is run outside of a jest suite, for instance in a js file, it runs fine without error.

[sync-by-unito]

➤ Franck Franck commented:

This issue seems related to #1255, and possibly a type resolution error with Dict under React Native.