How to store a class reference in Typescript

Node.ts

export class Node {
    //...
}

export class UnidirectionalNode extends Node {
    private next: Node;
    
    //...
}

export class BidirectionalNode extends Node {
    private next: Node;
    private previous: Node
    
    //...
}

NodeMapping.ts

import {Node, UnidirectionalNode, BidirectionalNode} from './Node.ts';

/**
 * Creates an array of the specified Node type with the specified length
 * @param NodeType This is a new-able type that inherits from the class `Node` in some way
 * @param {number} length The size of the array
 */
function createArray(NodeType: { new(): Node }, length: number): Node[] {
    let arr:Node[] = [];
    for(let i=0; i < length; i++) {
        arr[i] = new NodeType();
    }
    return arr;
}

let foo = createArray(UnidirectionalNode, 2); //Ok
let bar = createArray(BidirectionalNode, 12); //Ok
let bar = createArray(Node, 1); //Ok
let asdf = createArray(Number, 3); //Error!