Contact emails
nriba...@igalia.com, s...@chromium.org
Explainer
None
Specification
https://github.com/tc39/proposal-import-attributes
Summary
Import attributes[^1] are a JavaScript feature to allow annotating
import declarations, for example `import xxx from "mod" with { type:
"json" }'. Chrome originally shipped a previous version of the proposal
(in M91) using 'assert' as the keyword. This version has then been
updated to use 'with' due to some changes needed while integrating it
with HTML for JSON and CSS modules[^2]. [^1]:
https://github.com/tc39/proposal-import-attributes/ [^2]:
https://github.com/whatwg/html/issues/7233
Blink component
Blink>JavaScript>Language
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink>JavaScript>Language>
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
Other browsers either already implemented or are implementing this
feature, so we can expect wide compatibility. Chrome ships an older
deprecated version of the proposal, and we need to ship this new version
to be compatible with other browsers.
/Gecko/: No signal
/WebKit/: Shipped/Shipping
(https://developer.apple.com/documentation/safari-release-notes/safari-17_2-release-notes#JavaScript)
Shipped in Safari 17.2
/Web developers/: No signals
/Other signals/:
Security
This feature addresses the security concerns raised in
https://github.com/WICG/webcomponents/issues/839 Other than that, there
are no security concerns related to this feature:
https://github.com/tc39/proposal-import-attributes/blob/master/tag-security-and-privacy.md
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
Debuggability
None
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes
This is an ECMAScript feature, and as such it's mostly tested in
Test262: -
https://github.com/tc39/test262/tree/main/test/language/module-code/import-attributes
-
https://github.com/tc39/test262/tree/main/test/language/expressions/dynamic-import/import-attributes
There are also WPT tests: -
https://github.com/web-platform-tests/wpt/tree/master/html/semantics/scripting-1/the-script-element/import-attributes
Flag name on chrome://flags
--js-flags=--harmony-import-attributes
Finch feature name
kJavaScriptImportAttributes
Requires code in //chrome?
False
Estimated milestones
No milestones specified
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).
None
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5205869105250304
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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