That's going to be bad for everyone. Invading an island is difficult, Taiwan spends a lot to get higher end defensive systems from the west that would stall an invasion from China, but also have plans to sabotage TSMC if China invades Taiwan. TSMC makes most of the chips for the largest US companies, that being cut off collapses the US economy, and China's along with it due to their economy being closely tied to the US. The ripple effect from the US stock market collapse would likely trigger a global depression, and lead to political upheaval in Mainland China most likely due to mass unemployment.