"await is only valid in async function" even with top-level await support

[dandv]

I've added '@babel/plugin-syntax-top-level-await' and am passing --harmony-top-level-await to Node v13.10, but Jest still returns a syntax error:

SyntaxError: await is only valid in async function

 at Runtime._execModule (../node_modules/jest-runtime/build/index.js:988:58)

Are there plans to support top-level await in tests, perhaps part of #9430?

[SimenB]

This is a syntax error from node.

const { Script } = require('vm');

new Script('await Promise.resolve()');

Running that will throw the same error you're seeing from Jest.

It does work with ESM though, so it should work when #9430 lands, yes.

const { SourceTextModule } = require('vm');

const m = new SourceTextModule('await Promise.resolve()');

m.link(() => {})
  .then(() => m.evaluate())
  .then(
    () => console.log('success!'),
    error => console.error('argh', error),
  );

Prints "success!".

---

I'm not sure if vm.Script is supposed to support TLA? Maybe worth an issue in the node repo, but I suppose it's on purpose since I think Scripts has to evaluated synchronously. Not 100% certain though.

EDIT: TLA will only be support in modules

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