Method update

packages/core/src/render3/reactivity/signal.ts:33–33

* Update the value of the signal based on its current value, and * notify any dependents.

(updateFn: (value: T) => T)

   * notify any dependents.
   */
  update(updateFn: (value: T) => T): void;

  /**
   * Returns a readonly version of this signal. Readonly signals can be accessed to read their value