Unable to use async generators with ts-node (+ generated index.js)

Console

vagrant@ubuntu-xenial:/async-generators-test$ npm i -S typescript ts-node
...omitted...
vagrant@ubuntu-xenial:/async-generators-test$ node --version
v9.11.1
vagrant@ubuntu-xenial:/async-generators-test$ npm ls ts-node
/async-generators-test
└── ts-node@6.0.0
vagrant@ubuntu-xenial:/async-generators-test$ npx ts-node --harmony_async_iteration index.ts
> .exit
vagrant@ubuntu-xenial:/async-generators-test$ npx tsc -p tsconfig.json
vagrant@ubuntu-xenial:/async-generators-test$ node --harmony_async_iteration index.js
0
1
2
3
4
5
6
7
8
9

index.js

"use strict";
async function* numbers() {
    for (let i = 0; i < 10; i++)
        yield i;
}
new Promise(async (resolve, reject) => {
    for await (const i of numbers()) {
        console.log(i);
    }
}).then(() => {
    console.log("Done");
});

index.ts

async function* numbers() {
    for (let i = 0; i < 10; i++)
        yield i;
}

new Promise(async (resolve, reject) => {
    for await (const i of numbers()) {
        console.log(i);
    }
}).then(() => {
    console.log("Done");
});

tsconfig.json

{
  "compilerOptions": {
    "target": "esnext",
    "strict": true
  }
}