On 6/5/25 8:17 AM, 'Marja Hölttä' via blink-dev wrote:
Contact emails
ma...@google.com
Explainer
https://github.com/WICG/explicit-javascript-compile-hints-file-based
Specification
There's no spec or draft spec for the per-function part yet - getting
feedback on the input format is one of the goals of the Origin Trial.
Summary
Allow attaching information about which functions should be eager
parsed & compiled in JavaScript files.
The information will be encoded as magic comments.
This is an extension of the Per-File Explicit Compile Hints feature (
https://chromestatus.com/feature/5100466238652416 ), where we now
allow marking individual functions for eager parsing & compilation.
Blink component
Blink>JavaScript
TAG review
None
TAG review status
Pending
Risks
Interoperability and Compatibility
None
Gecko: N/A (https://github.com/mozilla/standards-positions/issues/780)
This is a position request for the previous iteration of compile
hints; the per-file version. We expect their views about this
extension to be similar.
WebKit: N/A (https://github.com/WebKit/standards-positions/issues/172)
This is a position request for the previous iteration of compile
hints; the per-file version. We expect their views about this
extension to be similar.
Non-blocking feedback: adding a comment about this proposal to those
existing issues seems good.
Web developers: Positive
- Microsoft is interested in prototyping; needs the Origin Trial for
evaluating performance in the wild
- General positive sentiment, e.g., TC39 tooling meeting
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
- Evaluate the performance improvement potential for real world web apps
- Get feedback about the input format
Ongoing technical constraints
None
Debuggability
None
Will this feature be supported on all six Blink platforms (Windows,
Mac, Linux, ChromeOS, Android, and Android WebView)?
No
Is this feature fully tested by web-platform-tests?
No
Flag name on about://flags
None
Finch feature name
None
Non-finch justification
Web developers need to enable this feature on their side; adding a
Finch flag as an additional gate doesn't make sense.
Requires code in //chrome?
False
Estimated milestones
No milestones specified
(Will need to wait for partners to be ready to start the Origin Trial)
We will need a range of milestones before approving. One of two options
might work for you:
1) You request 6 milestones now starting in MXXX (i.e., M140 to M145),
if you're reasonably confident your partners can be experiment in that
window.
2) You come back to the thread once you know which milestones you are
requesting and we can approve then.
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5153430045458432?gate=6215402451107840
This intent message was generated by Chrome Platform Status.
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