Angular 4 typescript Decorators are not valid here

Question

The following code

let isBrowserFactory2=function(@Inject(PLATFORM_ID) platformId: string){ return isPlatformBrowser(platformId);}

Gets the following error:

Decorators are not valid here

And this one

let isBrowserFactory=(@Inject(PLATFORM_ID) platformId: string):boolean=> isPlatformBrowser(platformId)

Gets the Expression expected error.

Why I can't use typescript's parameter decorators for a function?
How can I use @Inject() to inject something into a factory method?

SrAxi · Accepted Answer · 2017-05-08 09:43:08Z

1

Use @Inject in the constructor.

isBrowserFactory: boolean;

constructor(@Inject(PLATFORM_ID) platformId string) { 
  this.isBrowserFactory = this.isPlatformBrowser(platformId);
}

This way you are declaring platformId injecting PLATFORM_ID. And then, you can call your method isPlatformBrowser that I belive returns a boolean.

edited May 8, 2017 at 9:43

answered May 8, 2017 at 8:25

SrAxi

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6 Comments

Aluan Haddad Over a year ago

Basically correct, but class methods are supported, not just constructors. Object literal concise methods are not supported thouigh

SrAxi Over a year ago

@AluanHaddad I thought you had to use decorators before class declaration or inside the constructor.

SrAxi Over a year ago

@AluanHaddad Oh! Thanks! :D

Aluan Haddad Over a year ago

Glad to help. I updated my comment slightly for clarity. If you edit your answer, I would like to vote for it.

SrAxi Over a year ago

@AluanHaddad Thanks! You helped indeed. I think that this way could be clearer (updated answer). I understood what the OP was trying to do and I believe this way he may achieve it. Thanks for your help! :D

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