Launch the emulator, if it’s not launched, because of the launch option runEmulatorManually being set to true.
runEmulatorManually
true
// the emulator will not be launchedconst nostalgist = await Nostalgist.nes({ rom: 'flappybird.nes', runEmulatorManually: true }) // the emulator is going to be launchedawait nostalgist.launchEmulator()