Typescript: can you use constructor properties within a class’s private properties?

Is it bad practice to use a constructor properties of a class within a variable? I tried this and was surprised const name = new Name(time, course); worked, although I guess it makes sense since an instance of Eng needs those constructor properties to be made, then they’d be available to use elsewhere.

import { Name } from './Name'

class Eng {
   private _name = new Name(time, course);

   private constructor(time: String, course: String) {} 

   method1(){
      let results = name.convertTrials();

      return results;
   }
}