npm i run-emu -g

run-emu -l

run-emu run <name>

e.g.
run-emu run iPhone_XS_Max

run-emu -h

sage: run-emu [options] [command]

Options:

  -V, --version            output the version number
  -l --list [ios|android]  list iOS simulator or android emulator.
  -h, --help               output usage information

Commands:

  run <name>               launch simulator or emulator