[BugReport] - More explicit error message when directives are missing

I’m submitting a …

[x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior When you forgot to add a directive for one of your components and you use Inputs feature, the error is : “Can’t bind to ‘@INPUT_NAME’ since it isn’t a known native property”

Expected/desired behavior This error doesn’t make sense according to the actual mistake. A proper error would be to report the lack of the “directives” declaration in the @component

Reproduction of the problem I build this little example app, clone it and follow the readme https://github.com/etiennechabert/BugReportAG2

What is the expected behavior? A more explicit message

What is the motivation / use case for changing the behavior? Being more friendly with AG2 users, particularly new ones 😉

Please tell us about your environment:

• Angular version: 2.0.0-rc.5
• Browser: [all]
• Language: [TypeScript 1.8.10]

[etiennechabert]

Thanks for this detailed answer @pkozlowski-opensource.

I created this ticket because I believe that forgotten directives are one of the basic errors when you are new with AG2 (at least for me ^^).

A more generic error message (with a list of possible cases including typo, directives and so on) could a least put the developer on one of the good ways, instead of the wrong one. With the actual error message I checked the @Input declaration of my component multiple time before finally founding the real reason for this error.

Anyway it’s good to hear that you will be able to be more specific in the future on this kind of mistake.

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