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i18n ICU expressions don't work in attributes #63827
Description
Which @angular/* package(s) are the source of the bug?
localize, core
Is this a regression?
No
Description
Couldn't really find another issue, but using ICU expressions in HTML-attributes doesn't work or even breaks the parser when using variables in ICU expressions.
Can't get StackBlitz to work with @angular/localize, so I can't provide a minimal reproduction.
<!-- This will just show the text as present in the title attribute -->
<p i18n-title="@@test" title="Some Val: {someVal, select, 1 {ONE} 2 {TWO} other {OTHER}}">Hello</p>
<!-- This will fail to parse, see error below -->
<p i18n-title="@@test" title="Updated {someVal, plural, =0 {just now} =1 {one minute ago} other {{{ someVal }} minutes ago}}">Hello</p>
<!-- This however, works fine -->
<p i18n-title="@@test" title="Updated {{someVal}} minute(s) ago">Hello</p>Given you can use variables in attributes and that they already correctly create placeholders when extracting i18n, I think attributes should also be able to use ICU expressions.
Please provide a link to a minimal reproduction of the bug
No response
Please provide the exception or error you saw
X [ERROR] NG5002: Parser Error: Missing expected } at the end of the expression [{ someVal ]
Please provide the environment you discovered this bug in (run ng version)
Angular CLI: 20.3.1
Node: 22.13.1
Package Manager: npm 9.6.4
OS: win32 x64
Angular: 20.3.0
... common, compiler, compiler-cli, core, forms
... platform-browser, router
Package Version
------------------------------------
@angular-devkit/architect 0.2003.1
@angular-devkit/core 20.3.1
@angular-devkit/schematics 20.3.1
@angular/build 20.3.1
@angular/cdk 20.2.3
@angular/cli 20.3.1
@angular/material 20.2.3
@schematics/angular 20.3.1
rxjs 7.8.2
typescript 5.8.3
Anything else?
No response
Activity
JeanMeche commentedon Sep 16, 2025
The workaround is to add a space:
<p i18n-title="@@test" title="Updated {someVal, plural, =0 {just now} =1 {one minute ago} other { {{ someVal }} minutes ago}}">Hello</p>JeanMeche commentedon Sep 16, 2025
It's actually a dupe of #9571
wartab commentedon Sep 16, 2025
Only partially a duplicate.
The ICU expression doesn't work at all in the attribute.
JeanMeche commentedon Sep 16, 2025
Which is then a dupe of #21615
wartab commentedon Sep 16, 2025
Indeed, I hadn't found this when searching, thank you.
angular-automatic-lock-bot commentedon Oct 17, 2025
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