```js
// es6a.js

await foo(); // takes 10 milliseconds

require('./y.js');
```

```js
// es6b.js

console.log("from es6b");
```

```js
// cjsa.js

const a = require("es6a.js");
const b = require("es6b.js");
```

- If it takes less than 10 milliseconds to retrieve es6b.js from disk, this will evaluate es6a.js, y.js, es6b.js
- If it takes more than 10 milliseconds to retrieve es6b.js, this will evaluate es6a.js, es6b.js, y.js.

In contrast, with promises (or with equivalent ES6 imports):

```js
// cjsb.js

(async () => {
  const a = await require("es6a.js");
  const b = await require("es6b.js");
})
.catch(console.error);
```

Evaluation order will always be es6a.js, y.js, es6b.js.