[stevula]

I haven't read the article, but there's no special significant to the `to` here. It is just looking up the value of a key named `to` in an object called `fields`, using [dot notation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...):

  const fields = {
    to: "[e-mail]"
  };

  fields.to  // "[e-mail]