Why doesn't import class import work in ts?

Question

typescript

I have code

// src/index.ts
export class A {
  constructor(public type) {}
}

// index.ts

import { A } from './src/index.ts'

export class B {
  static C = A
}

// index.js

import { B } from './index'

let obj = new B.C('my obj')

console.log(obj.type)

But on startup it gives an error

// Cannot find module '.\src\array\array' imported from .\index.js 
// Did you mean to import ../src/array.js?

What to do??