in typehints/micropython/machine.pyi [0:0]
def init(
self,
baudrate: int = 1_000_000,
*,
polarity: int = 0,
phase: int = 0,
bits: int = 8,
firstbit: int = MSB,
sck: Pin | None = None,
mosi: Pin | None = None,
miso: Pin | None = None,