https://en.wikipedia.org/wiki/List_of_US_arms_sales_to_Taiwa...
The latest sale involves adding 60 Harpoon anti-ship missiles to the pile of hundreds they already have.
China will not have an easy time of invading such a well-armed country, and they also have to weigh the non-zero possibility of foreign intervention. It will be a costly endeavor by any measure.
China's best bet is a cultural/political/economic takeover, which will give other countries time to diversify chip manufacturing, as we are currently doing.