ECMAScript Decorators do not work with ng-packagr

[Juulsgaard]

Type of Issue

[x] Bug Report
[ ] Feature Request

Description

I am unable to disable experimentalDecorators, and thus am not able to use ECMAScript Decorators in my libraries.
When trying to use an ECMAScript decorator an error is thrown on build. This error does not occur when building with TSC.
It seems like the setting experimentalDecorators is being overwritten by ng-packagr, thus functionally prohibiting the use of ECMAScript decorators in Angular libraries.

How To Reproduce

Create a library in an Angular project.

Change the tsconfig.lib.json to disable experimentalDecorators

Utilise an ECMAScript only decorator in the library

Build library using ng build

This fails compilation with an error indicating that the decorator is an invalid format.

Expected Behaviour

ng-packagr should respect the experimentalDecorators setting in tsconfig and allow ECMAScript decorators.

Version Information

$ node_modules/.bin/ng-packagr --version
ng-packagr:            16.0.1
@angular/compiler:     16.0.1
rollup:                3.21.5
typescript:            5.0.4

@angular/*: 16.0.1
node: v16.18.0
yarn: 1.22.19

[github-actions]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

_{This action has been performed automatically by a bot.}