from typing import final

from mypy_extensions import i64, i32, u8

@final
class BytesWriter:
    def append(self, /, x: int) -> None: ...
    def write(self, b: bytes | bytearray, /) -> None: ...
    def getvalue(self) -> bytes: ...
    def truncate(self, size: i64, /) -> None: ...
    def __len__(self) -> i64: ...
    def __getitem__(self, i: i64, /) -> u8: ...
    def __setitem__(self, i: i64, x: u8, /) -> None: ...

@final
class StringWriter:
    def append(self, x: int, /) -> None: ...
    def write(self, s: str, /) -> None: ...
    def getvalue(self) -> str: ...
    def __len__(self) -> i64: ...
    def __getitem__(self, i: i64, /) -> i32: ...
