Function extendObservable

extendObservable<T, R>(target, properties, overrides?, options?): T & R
Extends an object with new properties and makes them observable.
Type Parameters
- T
- R extends {
  [key: string]: any;
  }
Parameters
- target: T
  The object to be extended and observed.
- properties: R
  The properties to add to the target object.
- Optional overrides: {
  [key: string]: "atom" | "computed" | "collection" | "reactiveProps" | false;
  }
  Optional overrides to define the type of the reactive property. If an override is false, the key will be ignored.
  - [key: string]: "atom" | "computed" | "collection" | "reactiveProps" | false
- Optional options: {
  name: string;
  }
  Options to configure the observable behavior.
  - name: string
    The name of the observable object. Defaults to an empty string. Using as prefix for reactive property names.
Returns T & R
The extended object with observable properties.
Example
```
let object = {
    value: 0,
    get double() {
        return this.value * 2;
    },
    increment() {
        this.value++;
    },
};

makeObservable(object, { value: "atom", double: "computed" });
extendObservable(object, {a: 1, b: 2});

let foo = 0;

autorun(() => {
    foo++;
    object.a;
});

console.log(foo); // 1
object.a++;
console.log(foo); // 2
```
- Defined in src/api/api.js:841