Angular dart component init -

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Is there a way to wait for the component to start? 

  
 Usage:  
  my-component foo = "bar" bar = "baz"> 
 my components & gt; ;   
 When I use the component like this, the manufacturer's print: tap, null  
 I write a setter for the fu and bar I can check on each set and both sets but if no value is provided then my init is never removed.  
 Do I have to apply an interface that is an init method or Provides something?   
 
 
 It is similar to shown here  
  Attacheeware  Apply the interface The values ​​of the example can not be set before the element is created so the constructor There is no chance to set the outer area on display.

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