package Math32 {
  use Inline 'C', <<~'END';

  #include <stdint.h>
  long calc(long input) {
    return (int32_t)((int32_t)input << 5);
  }
  END
}
use v5.36;
say Math32::calc(1169367104);
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Then all you need to do is write all the JS code in C, using int32_t variables and typecasts. If you want to declare the function parameter and return type as int32_t, you'd need to add it to the typemap, which is a hassle.