TypeError: TurtleDB is not a constructor

[ghost]

Hello Turtle-DB team,

i do install on first time with
npm i turtledb

then make a file turtledb.js

with code

const TurtleDB = require('turtledb');
const mydb = new TurtleDB('example');

then run it with
node turtledb.js

but showing error

TypeError: TurtleDB is not a constructor

Can you explain to me where is the problem?

Thank You