Function toRef

src/reactivity/ref.ts:155–167

(
  object: T,
  key: K
)

}

export function toRef<T extends object, K extends keyof T>(
  object: T,
  key: K
): Ref<T[K]> {
  if (!(key in object)) set(object, key, undefined)
  const v = object[key]
  if (isRef<T[K]>(v)) return v

  return createRef({
    get: () => object[key],
    set: (v) => (object[key] = v),
  })
}

export function shallowRef<T extends object>(
  value: T