Following the initial steps, get "already declared" error

[MegMM]

Hello, First, I'm a javascript newbie. I've used Pandas in python many times. I'm just following the first couple of steps with the following code:

import { Series, DataFrame } from 'pandas-js';
var Series = require('pandas-js').Series;
const ds = new Series([1, 2, 3, 4], {name: 'My test name', index: [2, 3, 4, 5]});
ds.toString();
console.log(ds);

When I run it I get the following error:

var Series = require('pandas-js').Series;
    ^
SyntaxError: Identifier 'Series' has already been declared

I'm assuming .Series and var Series are probably in conflict, but I'm not sure what the solution should be. Anyway, this code is directly from the pandas-js usage example.