You Might Not Need Binary AST™https://twitter.com/v8js/status/1117807107972243456 …
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Mathias Bynens Retweeted V8
You Might Not Need Binary AST™https://twitter.com/v8js/status/1117807107972243456 …
Mathias Bynens added,
Are you simply being tongue-in-cheek, or is this a valid concern (=value of binary AST actually being disputed)? Honest Q! 
I’m not convinced that Binary AST pays for itself, given all the optimizations that JavaScript engines and browsers can implement without introducing a brand new format. Main thread parse cost is no longer a bottleneck.
Even if it's off-thread, it still can be a valuable optimisation, especially in apps where most content can depend on that JS being parsed&compiled first.
With resource preloading and script streaming, scripts are usually already parsed + compiled (off the main thread!) by the time the HTML parser sees the <script>, at which point we can start executing right away.
I’m not sure if Binary AST can offer any significant benefit. 
Only if your HTML is large enough I guess. If it acts as merely an entry point for your script + few meta tags (including preload), it might arrive as a single chunk in which case preload tag is not that far. I mentioned few more benefits in the follow-up tweet.
I wasn’t talking about <link rel=preload> but rather about Chrome’s resource preloader (which is essentially an HTML prescanner looking for CSS/script URLs). But sure, as always, it depends™.
Is there a blink-side UMA from the time when a non-defer script is added to the DOM (by the parser or script) until it is parsed and executed? Something like the 95th percentile of that number is what most pages/apps will see on just about every load.
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