Function reactive

src/reactivity/reactive.ts:235–254

(obj: T)

 * Make obj reactivity
 */
export function reactive<T extends object>(obj: T): UnwrapRef<T> {
  if (!isObject(obj)) {
    if (__DEV__) {
      warn('"reactive()" must be called on an object.')
    }
    return obj
  }

  if (
    !(isPlainObject(obj) || isArray(obj)) ||
    isRaw(obj) ||
    !Object.isExtensible(obj)
  ) {
    return obj as any
  }

  const observed = observe(obj)
  setupAccessControl(observed)
  return observed as UnwrapRef<T>
}

/**
 * Make sure obj can't be a reactive