synthesis for Xilinx FPGAs without abc

[Nitcloud]

There is No abc command in YosysJS, so I used the -nowidelut argument when integrating Xilinx FPGA to avoid the execution of abc command. However, in the actual running process, it still displayed the error: No such command: abc. So, which of the commands contained in synth_xilinx still needs abc command? In addition, can the abc module not be compiled by Emscripten?