Whenever I use

```js
MyComponent.defaultProps = {
    ...something
}
```
after MyComponent is created by


```js
class MyComponent extends Component {
    ...
}

```
flow gives the error:

```
object literal. This type is incompatible with undefined
Did you forget to declare type parameter `DefaultProps` of identifier `Component`
```

This is type error. Flow has already inferred the type for your class before you try to mutate the defaultProps property.

And since you didn't give it a type it was inferred as void. This should fix it:

```js
class MyComponent extends Component {
    static defaultProps: Object;
}
```