Re: [blink-dev] Intent to Implement: Top Level Await

[Adam Klein]

On Thu, Aug 8, 2019 at 4:38 AM Yoav Weiss <yo...@yoav.ws> wrote:

On Wed, Aug 7, 2019 at 8:39 PM Joshua Litt <joshu...@chromium.org> wrote:

Contact emails joshu...@chromium.org Explainer https://github.com/tc39/proposal-top-level-await Design docs/spec Specification: https://tc39.es/proposal-top-level-await/ https://docs.google.com/document/d/15jxKo7kqj0bRHcnSmwjhj1XaWH1AXRDtYPiJHluCSiA/edit?usp=sharing Summary Allow keyword 'await' at the module level. Motivation Allows more seamless integration of async calls into the module loading process. Today this is accomplished by wrapping modules in async functions, but this pushes complexity into dependent modules and exposes implementation details. Risks

Interoperability and Compatibility Stage 3 TC39 proposal, thus risk is low that others browsers will not implement it. Firefox: No public signals Edge: No public signals Safari: No public signals

More of a TC39 process question, but aren't there clear signals from other vendors by the time the proposal is at stage 3? 

Stage 3 means that there's consensus from the committee at large (which includes other vendors) that it's ready for implementation, and that we expect it to make its way into the ES spec once it reaches Stage 4. But "consensus" and "support" aren't necessarily the same thing. Similarly, consensus and implementation aren't the same thing.

So your question leads to a Blink Intents process question: is there good guidance on what sort of data is good input to these fields?

Web developers: No signals

Searching Twitter brought up e.g. https://twitter.com/bitandbang/status/1136549425659162624 (with 100+ RTs and 300+ likes) indicating that there is at least some developer enthusiasm towards this feature.

Activation Not possible to polyfill.

Debuggability Could cause timeouts and races in the hands of inexperienced developers. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests? No Tests are WIP. Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5767881411264512

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