Support jscheck with jsdoc

[evollhhan]

I have create a jsconfig.json file in my project and turn jscheck on.

Here is my code

index.d.ts

declare namespace Project {
    class Student {
       private _name: string;
    }
}

index.js

class School {
  constructor() {
    this.students = [];
  }

  /** 
   * @param {Project.Student} student
   */
  addStudent(student) {
    this.students.push(student)
  }
}

const school = new School();

class Student {
  constructor(name = '') {
    /** 
     * @type {string}
     * @private
     */
    this._name = '';
    

    //
    //   WRONG HERE
    //   because the "_name" is not private here even though i define it in the jsdoc
    //
    school.addStudent(this)
  }
}

[mjbvz]

This is being tracked upstream by microsoft/TypeScript#14009