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doc: add note regarding unfinished TLA #41434

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merged 2 commits into from Jan 10, 2022
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doc: add note regarding unfinished TLA #41434

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doc: add note regarding unfinished TLA
aduh95 Jan 7, 2022
dde2a08
fixup! doc: add note regarding unfinished TLA
aduh95 Jan 8, 2022
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27 changes: 23 additions & 4 deletions doc/api/esm.md
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Expand Up @@ -591,15 +591,17 @@ would provide the exports interface for the instantiation of `module.wasm`.

## Top-level `await`

<!--
added: v14.8.0
-->

> Stability: 1 - Experimental

The `await` keyword may be used in the top level (outside of async functions)
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Perhaps hyphenate top-level? Also perhaps move top-level body together before the (outside of async functions) rather than splitting it up?

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The wording in the spec is

Top-Level Await allows the await keyword to be used at the top level of the module goal.

It looks to me that we should keep it without hyphen. Agreed we should move "body" before the parenthesis though 👍

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Maybe we can remove the parenthesis altogether, I don't think bringing async function helps here.

within modules as per the [ECMAScript Top-Level `await` proposal][].
body of an ECMAScript module.

Assuming an `a.mjs` with

<!-- eslint-skip -->

```js
export const five = await Promise.resolve(5);
```
Expand All @@ -616,6 +618,23 @@ console.log(five); // Logs `5`
node b.mjs # works
```

If a top level `await` expression never resolves, the `node` process will exit
with a `13` [status code][].

```js
import { spawn } from 'child_process';
import { execPath } from 'process';

spawn(execPath, [
'--input-type=module',
'--eval',
// Never-resolving Promise:
'await new Promise(() => {})',
]).once('exit', (code) => {
console.log(code); // Logs `13`
});
```

<i id="esm_experimental_loaders"></i>

## Loaders
Expand Down Expand Up @@ -1426,7 +1445,6 @@ success!
[Conditional exports]: packages.md#conditional-exports
[Core modules]: modules.md#core-modules
[Dynamic `import()`]: https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#Dynamic_Imports
[ECMAScript Top-Level `await` proposal]: https://github.com/tc39/proposal-top-level-await/
[ES Module Integration Proposal for WebAssembly]: https://github.com/webassembly/esm-integration
[Import Assertions]: #import-assertions
[Import Assertions proposal]: https://github.com/tc39/proposal-import-assertions
Expand Down Expand Up @@ -1461,5 +1479,6 @@ success!
[percent-encoded]: url.md#percent-encoding-in-urls
[resolve hook]: #resolvespecifier-context-defaultresolve
[special scheme]: https://url.spec.whatwg.org/#special-scheme
[status code]: process.md#exit-codes
[the official standard format]: https://tc39.github.io/ecma262/#sec-modules
[url.pathToFileURL]: url.md#urlpathtofileurlpath