Function propertyNames

propertyNames(instance: any, skipOwn?: boolean): string[]
Helper to introspect the public available property names.
Parameters
- instance: any
  the instance to introspect.
- skipOwn: boolean = false
  skip additional object property names that were not part of the original declare().
Returns string[]
property names
Example
```
const Clazz = declare({
    firstName: "",
    lastName: ""
});
const instance = new Clazz();
const names = propertyNames(instance);
//-> names === ["firstName","lastName"]
```
- Defined in Mutable.ts:430