Decorators in Angular 4 using TypeScript are not permitted in this context

Here is some code that is throwing errors:

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

This results in the following error message:

Decorators are not valid here

And then we have this code snippet:

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

But unfortunately, it produces an Expression expected error.

  • Why am I encountering issues with using typescript's parameter decorators for a function?
  • Is there a proper way to utilize @Inject() for injecting objects into a factory method?
angulartypescript

Answer №1

To ensure proper functionality, make sure to utilize @Inject within the constructor.

isDeviceMobile: boolean;

constructor(@Inject(DEVICE_ID) deviceId string) { 
  this.isDeviceMoobile = this.checkIfDeviceIsMobile(deviceId);
}

By following this approach, you will be effectively injecting deviceId which references DEVICE_ID. Subsequently, you can invoke the method checkIfDeviceIsMobile which should logically return a boolean value.

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