Pilot lights stay lit all the time so no igniter is required. My range has electric spark igniters. They don't work when the power is out but there is also no pilot light expelling gas. I just manually light the burner when the power is out.

My gas stove has spark ignitors for the burners and the oven has an incandescent ignitor. The oven has safety interlocks so the gas valve won't open if the ignitor is not hot. The oven cannot be lit manually, but the stovetop burners can. So in a power outage, I can cook in pots and pans but not bake.

Usually the pilot energizes a thermocouple+solenoid that is used to hold the gas valve open, so the valve shuts if the pilot goes out.