Function observer

test/unit/persisters/common/databases.ts:162–164

(_1: any, _2: any, tableName: string)

          const nextChange = await new Promise<WatchOnChangeEvent>(
            (resolve) => {
              const observer = (_1: any, _2: any, tableName: string) => {
                resolve({changedTables: [tableName]});
              };
              sqlite3.update_hook(db, observer);
            },
          );