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Description
Command
build
Is this a regression?
- Yes, this behavior used to work in the previous version
The previous version in which this bug was not present was
No response
Description
When extending a class, which was imported and aliased, in a class expression, using the same name, there will be a name clash after building with "optimization": false.
This will throw a ReferenceError: Cannot access 'ClassName' before initialization at runtime, every time the class expression gets executed.
I do not know for sure, if this ever worked. But I think it did, sadly I can not say in which version. Probably with a different builder than @angular/build:application.
Minimal Reproduction
Running ng build with "optimization": false on the following file:
import { MyService as RealMyService } from './my-service'; export const factory = () => new (class MyService extends RealMyService { })
This will result in a compilation output of:
var factory = () => new class MyService extends MyService {
}
();
Minimal reproducer: https://github.com/dmp-gottschalk/angular-karma-build-alias-reproducer/
Exception or Error
ERROR ReferenceError: Cannot access 'MyService' before initialization
at factory (factory.ts:3:59)
at _App.makeServiceDoStuff (app.ts:16:5)
at App_Template_button_click_39_listener (app.html:343:18)
at executeListenerWithErrorHandling (debug_node.mjs:12982:16)
at wrapListenerIn_markDirtyAndPreventDefault (debug_node.mjs:12965:22)
at HTMLButtonElement.<anonymous> (dom_renderer.mjs:736:142)
at _ZoneDelegate.invokeTask (zone.js:431:33)
at debug_node.mjs:16349:55
at AsyncStackTaggingZoneSpec.onInvokeTask (debug_node.mjs:16349:36)
at _ZoneDelegate.invokeTask (zone.js:430:38)
Your Environment
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/ △しろさんかく \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
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Angular CLI: 20.2.0
Node: 24.2.0
Package Manager: npm 11.5.2
OS: linux x64
Angular: 20.2.1
... common, compiler, compiler-cli, core, forms
... platform-browser, router
Package Version
------------------------------------
@angular-devkit/architect 0.2002.0
@angular-devkit/core 20.2.0
@angular-devkit/schematics 20.2.0
@angular/build 20.2.0
@angular/cli 20.2.0
@schematics/angular 20.2.0
rxjs 7.8.2
typescript 5.9.2
zone.js 0.15.1
Anything else relevant?
Because build is affected, commands using that (eg serve, test) are also affected