Intent to Experiment: Explicit Compile Hints with Magic Comments

[Marja Hölttä]

Contact emails ma...@chromium.org, les...@chromium.org Explainer None Specification None Summary Allow attaching information about which functions should be eager parsed & compiled in JavaScript files. The information will be encoded as magic comments. We'll be experimenting with different magic comment formats, e.g., marking all functions in a file for eager compilation, or marking only a subset of functions. For more information, see this doc. Blink component Blink>JavaScript TAG review None TAG review status Pending Risks Interoperability and Compatibility No interoperability / compatibility risks. Other browsers are likely to ignore the hints if they perceive they cannot benefit from them. Ignoring the hint is allowed behavior. We plan to make the hints generic though, so that other browsers can later start to support them too. Gecko: N/A; we've requested the position at https://github.com/mozilla/standards-positions/issues/780 . Note that there's no interop risk. WebKit: N/A; we've requested the position at https://github.com/WebKit/standards-positions/issues/172 . Note that there's no interop risk. Web developers: Positive signals from partners who want to use compile hints to eager-compile core JS files Other signals: WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? None Goals for experimentation We’re aiming to OT those hints to get a better understanding about The overall performance wins possible DevX and tool support needed to support adding compile hints magic Ongoing technical constraints None Debuggability None 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 The feature doesn't trigger any functional changes and cannot be tested by WPT. Flag name --js-flags=--compile-hints-magic or --enable-features=CompileHintsMagic Requires code in //chrome? False Estimated milestones OriginTrial desktop last 117 OriginTrial desktop first 114 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5100466238652416 This intent message was generated by Chrome Platform Status.

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[Yoav Weiss]

LGTM to experiment M114-M117 inclusive.

Thanks for filing positions on this. While this doesn't pose any immediate interop risks, if other vendors can benefit from such magic comments, it'd be significantly better for web developers that we'd all converge on the same magic :)

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