initialized class variables in base class constructor are null

[venelin-mihaylov]

TypeScript Version: 2.3.2
CODE

interface IMember {
      name?: string
    }

    interface IBase {
      member1?: IMember
    }

    class Base implements IBase {
      public get member1() {
        return this._member1
      }
      public _member1: IMember
      public constructor() {
        console.log('parent constructor this')
        console.log(this)
        console.log('parent constructor _member1')
        const a = this._member1;
        console.log(a)
        expect(a).to.not.be.undefined
      }
    }

    class Child extends Base {
      public _member1: IMember = {
        name: 'grrrr'
      }
    }

    const o = new Child()

Expected Behavior:
I initialize a member variable in the Child class during class declaration.
I expect in the parent class constructor the class variable to be initialized.

Actual behavior:
It is not.
However, it is initialized after the object is constructed.

[mhegazy]

Duplicate of #1617

[mhegazy]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.