I've never seen this pattern before in JS, in the parameters for the constructor. playing with it in the browser, I can see it lets you define default values for expected arguments when calling it but you can provide other values.

What is this called? I'd like to read more about it.

  class Resource{
    constructor({
      min = 0,
      max = 1,
      count = 0
    }={}){
      this.min = min;
      this.max = max;
      this.count = count;
    }
  }