Parameter decorators with Babel (like in Typescript)

Question

is there way to use parameter decorators with Babel as it is possible in Typescript.

sample of a typescript code:

class A {
   constructor(@Inject('IService') private service: IService) {

   }
}

I want to write this code with Babel:

class A {
   constructor(@Inject('IService') service) {
      this.service = service;
   }
}

I haven't found any info on this question yet. Is there like a plugin in a certain preset that does exactly this?

If there's not way to do that without crutches, is there way to use decorators on constructors ? Example

class A {
   @Inject('IService')
   constructor(service) {
      this.service = service;
   }
}

Thanks.

This is the decorator transform: babeljs.io/docs/plugins/transform-decorators . But do you really need it? Depending on how it’s supposed to work, why not just write this.service = getIService() in the constructor? — Felix Kling
– Felix Kling, Commented Oct 5, 2017 at 10:55
I agree. Using decorators for this seems to make it drammatically more complicated. — loganfsmyth
– loganfsmyth, Commented Oct 5, 2017 at 14:59
I posted the question to understand if it's possible, not for reviews on how it looks. Thanks. — thohoh
– thohoh, Commented Oct 5, 2017 at 20:06
I hope they get to make this work in ES7, it comes in really handy for injects and other utilities. Regarding the last question, I guess you can do the following jsfiddle.net/mm52n6se — RecuencoJones
– RecuencoJones, Commented Dec 14, 2017 at 16:31

Douglas Reid · Accepted Answer · 2019-07-19 23:27:18Z

0

You now have two options:

Unfortunately, the first option is not perfect in detail, as the following example illustrates:

@Get('/:id')
getUser(@Param("id") id: number) {
  cosnole.log(typeof id); // string
}

Douglas Reid

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answered Jul 19, 2019 at 18:55

xueboren

1

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