Function linkedSignal

packages/core/src/render3/reactivity/linked_signal.ts:55–90

(
  optionsOrComputation:
    | {
        source: () => S;
        computation: ComputationFn<S, D>;
        equal?: ValueEqualityFn<D>;
        debugName?: string;
        set?: (value: D, rawSet: (value: D) => void) => void;
      }
    | (() => D),
  options?: {
    equal?: ValueEqualityFn<D>;
    debugName?: string;
    set?: (value: D, rawSet: (value: D) => void) => void;
  },
)

}): WritableSignal<D>;

export function linkedSignal<S, D>(
  optionsOrComputation:
    | {
        source: () => S;
        computation: ComputationFn<S, D>;
        equal?: ValueEqualityFn<D>;
        debugName?: string;
        set?: (value: D, rawSet: (value: D) => void) => void;
      }
    | (() => D),
  options?: {
    equal?: ValueEqualityFn<D>;
    debugName?: string;
    set?: (value: D, rawSet: (value: D) => void) => void;
  },
): WritableSignal<D> {
  if (typeof optionsOrComputation === 'function') {
    const getter = createLinkedSignal<D, D>(
      optionsOrComputation,
      identityFn<D>,
      options?.equal,
    ) as LinkedSignalGetter<D, D> & WritableSignal<D>;
    return upgradeLinkedSignalGetter(getter, options?.debugName, options?.set);
  } else {
    const getter = createLinkedSignal<S, D>(
      optionsOrComputation.source,
      optionsOrComputation.computation,
      optionsOrComputation.equal,
    );
    return upgradeLinkedSignalGetter(
      getter,
      optionsOrComputation.debugName,
      optionsOrComputation.set,
    );
  }
}

function upgradeLinkedSignalGetter<S, D>(
  getter: LinkedSignalGetter<S, D>,