How to create a generic buffer in TypeScript?

Question

I have the following class:

export class BufferData {
  arr: Float32Array;
  index: number;

  constructor() {
    this.arr = new Float32Array(8);
    this.index = 0;
  }

  maybeResize() {
    let curArr = this.arr;

    if (this.index < curArr.length) {
      return;
    }

    let newArr = new Float32Array(curArr.length * 2);

    for (let i = 0; i < curArr.length; i++) {
      newArr[i] = curArr[i];
    }

    this.arr = newArr;
  }

  push(val: number) {
    this.maybeResize();

    this.arr[this.index++] = val;
  }
}

This works, but I would like to make it generic if possible. That is, I'd like the signature of the class to be something like:

export class BufferData<T extends TypedArray>

Such that all instances of Float32Array in the above code would be replaced with T and I would be able to create one like this:

let buffer = new BufferData<Float32Array>();

However, I could not find whether or not Float32Array had a parent. Also, when I tried to do something like:

this.arr = new T(8);

in the constructor, it told me T was a type and not a value.

Is this sort of thing possible? Or do I have to just duplicate the class for each concrete type I wish to use it with?