(TS) Property 'onError' does not exist on type '{}' #178

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fergalmoran · 2025-08-09T17:15:18Z

fergalmoran commented

2025-08-09 17:15:18 +00:00

Originally created by @The-Futurist on 2/11/2018

Can anyone explain what one must do to resolve this? Or tell me if it even needs to be resolved?

I'm working on a rudimentary project created in Visual Studio 2017 for ASP.NET Core web app that uses Angular.

I'm running VS 2017 15.5.6 and I'm trying to educate myself about Angular.

When one begins to use a new technology these kinds of warnings/errors are huge because one has no idea if there's something wrong with Visual Studio, Angular, Javascript, some package, etc, etc, etc or one's own code.

Traditionally error messages reported in the Visual Studio Error List window are to be taken very seriously so I'd like to get to the bottom of this.

The presence of this error incidentally, is an example of something else I posted yersterday here:

https://github.com/aspnet/Home/issues/2868

I am only posting this issue here because this repo came up with search hits when I searched for info about it, as a relative novice I'd have absolutely no way of looking at the error message and inferring that I should post an issue to a repo named JavaScriptServices !!!

Although I found several issues here about this none of these help me, they seem to only be of relevance to developers intimately involved in this or that repo, no use whatsoever to the "ordinary" Visual Studio developer trying to fathom these new technologies.

Thanks.

PS: I actually see TWO errors, here's the text of the other:

"The target "UpdateDesignTimeXaml" does not exist in the project."

*Originally created by @The-Futurist on 2/11/2018* Can anyone explain what one must do to resolve this? Or tell me if it even _needs_ to be resolved? I'm working on a rudimentary project created in Visual Studio 2017 for ASP.NET Core web app that uses Angular. I'm running VS 2017 15.5.6 and I'm trying to educate myself about Angular. When one begins to use a new technology these kinds of warnings/errors are huge because one has no idea if there's something wrong with Visual Studio, Angular, Javascript, some package, etc, etc, etc or one's own code. Traditionally error messages reported in the Visual Studio _Error List_ window are to be taken **very seriously** so I'd like to get to the bottom of this. The presence of this error incidentally, is an example of something else I posted yersterday here: https://github.com/aspnet/Home/issues/2868 I am only posting this issue here because this repo came up with search hits when I searched for info about it, as a relative novice I'd have absolutely no way of looking at the error message and inferring that I should post an issue to a repo named JavaScriptServices !!! Although I found several issues here about this none of these help me, they seem to only be of relevance to developers intimately involved in this or that repo, no use whatsoever to the "ordinary" Visual Studio developer trying to fathom these new technologies. Thanks. PS: I actually see TWO errors, here's the text of the other: "The target "UpdateDesignTimeXaml" does not exist in the project."

fergalmoran closed this issue

2025-08-09 17:15:18 +00:00

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Reference: github/JavaScriptServices#178