LGTM2
On 9/15/26 12:14 p.m., 'Dan Clark' via blink-dev wrote:
Thank you! LGTM1
On Tuesday, September 15, 2026 at 6:14:21 AM UTC-7 Caio Lima wrote:
On Sep 14, 2026, at 6:12 PM, Dan Clark <[email protected]> wrote:
/> Web developers: No signals/
I’ve found this documented signal on proposal’s repo
https://github.com/tc39/proposal-defer-import-eval/issues/18. It’s
important to notice that since it’s from 2023, it predates the
`import defer` syntax, but the semantics is the same of current
proposal.
In addition to that, on
https://2025.stateofjs.com/en-US/features/#js_new_features it’s
the most popular feature that is not in browsers yet other than
decorators, and there are some articles and podcasts about it,
like
https://byteiota.com/typescript-59-import-defer-lazy-imports/ (it
talks mostly about TS import defer) and
https://youtu.be/_x5f35JVKt8?t=338.
Is there any sign of developer interest we can point to here?
*/> Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?/*
/> No/
I'd expect this to be shipping everywhere -- should this say "yes"?
Sorry, I overlooked this. It’s yes.
-- Dan
On Monday, September 14, 2026 at 9:18:46 AM UTC-7 Caio Lima wrote:
*Contact emails*
[email protected], [email protected]
*Explainer*
https://github.com/tc39/proposal-defer-import-eval
*Specification*
https://tc39.es/proposal-defer-import-eval
*Summary*
`import defer` allows lazily evaluating ES modules, to reduce
the startup impact of modules that are not actually needed
for the first JavaScript execution. This provides an
easier-to-use alternative to dynamic import. While dynamic
import provides more benefits, as it allows deferring loading
of modules rather than just evaluation, it has a lot of
friction due to its asynchronous nature, and thus it's not
always usable. The `import defer` TC39 proposal follows the
same syntax as `import source`, but it only works with
namespace imports: ``` import defer * as namespace from
"./some-module.js" ``` The module will be synchronously
executed on property access on the module namespace object.
To allow synchronous execution, not all of
`./some-module.js`'s dependency tree will be deferred.
Modules that contain top-level await will be eagerly
executed, leaving only the synchronous parts of the tree for
later.
*Blink component*
Blink>JavaScript
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EJavaScript%22>
*Web Feature ID*
import-defer <https://webstatus.dev/features/import-defer>
*Motivation*
/No information provided/
*Initial public proposal*
/No information provided/
*TAG review*
/No information provided/
*TAG review status*
Not applicable
*Goals for experimentation*
None
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/:
Positive (https://bugzilla.mozilla.org/show_bug.cgi?id=1952263) Mozilla
was originally championing the proposal
/WebKit/:
Shipped/Shipping (https://bugs.webkit.org/show_bug.cgi?id=320867)
/Web developers/: No signals
/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?
/No information provided/
*Debuggability*
Changes were added to CDP to properly support feature UX (for
detailed information, see
https://issues.chromium.org/issues/552666773)
*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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
Test262 tests: -
https://github.com/tc39/test262/tree/main/test/language/import/import-defer -
https://github.com/tc39/test262/tree/main/test/language/expressions/dynamic-import/import-defer
*Flag name on about://flags*
/No information provided/
*Finch feature name*
V8Flag_js_defer_import_eval
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/398218423
*Estimated milestones*
Shipping on desktop 155
Shipping on Android 155
Shipping on WebView 155
*Anticipated spec changes*
Open questions about a feature may be a source of future web
compat or interop issues. Please list open issues (e.g. links
to known github issues in the project for the feature
specification) whose resolution may introduce web
compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
/No information provided/
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5071131271888896?gate=6546259918848000
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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