Function notifyChange

Helper to trigger custom change notification.

Example

 import {declare, notifyChange} from "apprt-core/Mutable";
 const globalCounter = 0;
 let Clazz = declare({
     counter: {
         get() {
             return globalCounter;
         }
     }
});

 let instance = new Clazz();
 instance.watch("counter",({value})=>{
     console.log("count:"+value);
 })

 // ensure that external counter can be watched
 globalCounter++;
 notifyChange(instance,"counter");
 //-> count: 1
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