Handle unhandled promise rejections

[mtsgrd]

• users need this feedback in case something goes wrong

[ndom91]

Maybe I'm missing something, but it should still be shown to the user before.

The error would be returned here from handleError handle and from there available in the $page.error store in the layout.svelte/page.svelte file and shown to the user via showError there

EDIT: Ah but does the handler only handle thrown errors and not unhandled rejected promises?

[mtsgrd]

Yeah, promises are special, SvelteKit doesn't intercept them. ✌️

[Caleb-T-Owens]

Promises are equivalent to a lazily evaluated Result<> type.

An async function that throws an exception, IE:

async function foo() {
  if (false) {
    return "sadf"
  } else {
    throw new Error("asdf")
  }
}

is more or less the same as saying:

function foo() {
  return new Promise((resolve, reject) => {
    if (false) {
      return resolve("sadf")
    } else {
      return reject(new Error("asdf"))
    }
  }
}