As explained .text() returns a promise, and the fact that many people don't know that and that your 1-line solution does not work is a strong indication that my solution is helpful!

With magic-promises you don't need to worry about whether something regurns a promise or not. See fs-array, some methods will return promises and some won't, but you can just treat them all the same.

I thought I was so clever! But yes I see how it's very different. In general, magic (or using Proxy) scares me, but I'm warming up to the idea here.

fetch's Response.text also returns a Promise, so you'd have to await twice:

  const lines = (await (await fetch(myUrl)).text()).split('\n');

I've always just added an overload:

    function fetchText(input?: string | Request, init?: RequestInit) {
      return fetch(input, init).then(x => x.text())
    }

    function fetchJson(input?: string | Request, init?: RequestInit) {
      return fetch(input, init).then(x => x.json())
    }

Shucks, I can see how it becomes verbose.