Function properties

properties(clazzOrObject: any, definitions: Record<string | symbol, any>): void
Helper to extend an existing class with new properties.
Parameters
- clazzOrObject: any
  the clazz to extend.
- definitions: Record<string | symbol, any>
  the properties specification.
Returns void
Example
```
class MyClazz extends Mutable {

}
properties(MyClazz, {
    msg: {
        value: "test"
    }
});
let o = new MyClazz({
    msg: "test1"
});
```
- Defined in Mutable.ts:489