See here:

https://typescripttolua.github.io/play#code/FDBmFcDsGMBcEsD2kAEAHe0DWAeAKgHwAUAhgFwoBGiiANgKYmQA0VFer07AlOwN7AUQgE71Y4YahIoA-FRQVowAL4hoyAM516AOlqIA5kQzYisYeHqsoAE3qh4kejdYAiSIjT1X3bsCA

When a generic type, ternary expressions and null coalescing (and possibly others) are generated incorrectly (assuming that the left argument cannot be falsy).