without js -- (but maybe, at some point, and obviously that is as custom verbatim JavaScript code instead of assembly code)
#ilASM{
    [32]
        mov eax,[var]
    [64]
        mov rax,[var]
    [PE32]
        push eax                        -- uExitCode
        call "kernel32.dll","ExitProcess"
    [PE64]
        mov rcx,rax                     -- uExitCode
        call "kernel32.dll","ExitProcess"
    [ELF32]
        mov ebx,eax                     -- error_code (p1)
        mov eax,1                       -- sys_exit(ebx=int error_code)
        int 0x80
--      xor ebx,ebx                     -- (common requirement after int 0x80)
    [ELF64]
        mov rdi,rax                     -- error_code (p1)
        mov rax,60                      -- sys_exit(rdi=int error_code)
        syscall
    []
      }