Added several missing annotations to serializer.pyi

[Spider84pr]

Added several missing annotations to serializer.pyi
Also I have added "six" library to Metadata.toml

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[donBarbos]

Thanks! But it seems like adding types-six here is redundant, since only text_type alias for str is used.

[donBarbos]

If you want to use types for six, you need to add types-six since the types are distributed separately:

Suggested change

	requires = ["six"]
	requires = ["types-six"]

[donBarbos]

See below

Suggested change

from six import text_type

[donBarbos]

But since you are only using text_type (adding types-six specifically), this doesn't make sense, since text_type is just an alias for str.
Also, both methods could return bytes if self.encoding is set:

Suggested change

	def encode(self, string: text_type) -> str: ...
	def encodeStrict(self, string: text_type) -> str: ...
	def encode(self, string: str) -> str | bytes: ...
	def encodeStrict(self, string: str) -> str | bytes: ...

[donBarbos]

1. Indeed, encoding could accept str, but it is an optional argument (this is what causes problems with CI passing).
2. treewalker looks like some Iterable of dictionaries (i'd call it _Token), but since we don't have _Token TypedDict yet, I suggest using Iterable[dict[str, Incomplete]]
3. serialize doesn't just return a string, it yields it, and since with the encoding set, it can be bytes. I think you can use Iterator or Generator

Suggested change

	def serialize(self, treewalker: str, encoding: str) -> str: ...
	def serialize(self, treewalker: Iterable[dict[str, Incomplete]], encoding: str | None = None) -> Iterator[str | bytes]: ...

[donBarbos]

same here (except return type)
But I suggest you use overload here to differentiate between cases where str is returned and cases where bytes is returned

Suggested change

	def render(self, treewalker: str, encoding: str) -> str: ...
	@overload
	def render(self, treewalker: Iterable[dict[str, Incomplete]], encoding: Literal[""] | None = None) -> bytes: ...
	@overload
	def render(self, treewalker: Iterable[dict[str, Incomplete]], encoding: str) -> str: ...

[Spider84pr]

@donBarbos Than you very much - i will study all your explanation and follow all tour advices. It will be very useful for me because I am planning to continue contribute to typeshed