https://www.typescriptlang.org/docs/handbook/2/classes.html#static-blocks-in-classes

Static blocks are skipped when the code is transpiled to Lua.

Ex.

class A {
    static {
        console.log("Hello world")
    }
}

The code doesn't output anything in TSTL while it prints "Hello world" in TS.

TSTL playground: https://typescripttolua.github.io/play/#code/MYGwhgzhAECC0G8BQ1XQgFzBglsRKaRwA9gHYQkgCmAdCCQOYAUARABLUgPQDuJAJxAATVgEpCqAL5IZQA

TS playground: https://www.typescriptlang.org/play?ssl=6&ssc=1&pln=1&pc=1#code/MYGwhgzhAECC0G8BQ1XQgFzBglsRKaRwA9gHYQkgCmAdCCQOYAUARABLUgPQDuJAJxAATVgEpCqAL5IZQA