Original Answer

The issue occurs when you try to instantiate the class without passing arguments, as you did not specify arguments will be optional.

Make arguments optional like this

export class User {

  ... 



  constructor(id?: number, etabName?: string, ) {

    this.id = id || 0; //Specify default value

    this.etabName = etabName || ''; //Specify default value

   

  }

  ...

}

then you can instantiate class without arguments

const user = new User();//works

Update

You can write it even better with this syntax below, Typescript will take care of creating properties and assigning default values to it.

class User {

  constructor(private id: number = 0, private etabName: string = '') {

  }



   ...setters and getters omitted for readability

}

The above typescript will be converted to below javascript

class User {

    constructor(id = 0, etabName = '') {

        this.id = id;

        this.etabName = etabName;

    }

   ...setters and getters omitted for readability

}