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WDYT of naming it allowTopLevelAwait, since it is how it's usually referred to?

Also, I think that this code should still throw:

function fn() {
  await x;
}

Fixed lint errors, added tests, and ensured an error is thrown for the case raised by @nicolo-ribaudo.
I kept the name as allowAwaitOutsideFunction since it's technically more correct and aligns with existing and similar options (feel free to tweak to taste however).

Could we maybe rename the tests?

I wasn't sure about that but noticed a large collection of tests incremented as numbers. Is there a particular place or naming scheme you had in mind?

You could put it in fixtures/es2017/async-functions/allowAwaitOutsideFunction.

I kept the name as allowAwaitOutsideFunction since it's technically more correct and aligns with existing and similar options

I still prefer the allowTopLevelAwait name, but I'm ok with this since it is how allowReturnOutsideFunction is named.

I just learned that this is actually a new proposal (https://github.com/MylesBorins/proposal-top-level-await). Can you define this feture it using a new Babylon plugin (topLevelAwait) instead of an option?

Something like this:

if (isAwait && !this.state.inFunction) this.expectPlugin("topLevelAwait");

The tests would then go in packages/babylon/test/fixtures/experimental/top-level-await/basic/input.js. Also, the Babylon readme should then be updated.

I rather not since the proposal, and its variations, are much more involved. I think later, if someone wants to add a plugin to support the proposal (and variations) more in-depth, then they could build on top of allowAwaitOutsideFunction

Update:

Moved tests to a more readable place.

I think later, if someone wants to add a plugin to support the proposal (and variations) more in-depth, then they could build on top of allowAwaitOutsideFunction

that's true