@pexip/signal/api-docs/type-aliases/ExtractSignalsState.mdx

an observer pattern while avoiding boilerplate code. https://en.wikipedia.org/wiki/Signals_and_slots

```ts
type ExtractSignalsState<T> = { [K in keyof T]: T[K] extends Signal<infer S> ? S | undefined : undefined };
```

## Type Parameters

| Type Parameter |
| ------ |
| `T` *extends* [`Signal`](../interfaces/Signal.mdx)\<`unknown`\>[] |