diff --git a/third_party/2and3/markdown/__init__.pyi b/third_party/2and3/markdown/__init__.pyi
new file mode 100644
index 000000000..07ef67f1e
--- /dev/null
+++ b/third_party/2and3/markdown/__init__.pyi
@@ -0,0 +1 @@
+from .core import Markdown as Markdown, markdown as markdown, markdownFromFile as markdownFromFile
diff --git a/third_party/2and3/markdown/core.pyi b/third_party/2and3/markdown/core.pyi
new file mode 100644
index 000000000..5cf7c6305
--- /dev/null
+++ b/third_party/2and3/markdown/core.pyi
@@ -0,0 +1,49 @@
+from typing import BinaryIO, Mapping, Optional, Sequence, Text, TextIO, Union
+from typing_extensions import Literal
+
+from .extensions import Extension
+
+class Markdown:
+    def __init__(
+        self,
+        *,
+        extensions: Optional[Sequence[Union[str, Extension]]] = ...,
+        extension_configs: Optional[Mapping[str, Mapping[str, str]]] = ...,
+        output_format: Optional[Literal["xhtml", "html"]] = ...,
+        tab_length: Optional[int] = ...,
+    ) -> None: ...
+    def build_parser(self) -> Markdown: ...
+    def registerExtensions(
+        self, extensions: Sequence[Union[Extension, str]], configs: Mapping[str, Mapping[str, str]]
+    ) -> Markdown: ...
+    def build_extension(self, ext_name: Text, configs: Mapping[str, str]) -> Extension: ...
+    def registerExtension(self, extension: Extension) -> Markdown: ...
+    def reset(self: Markdown) -> Markdown: ...
+    def set_output_format(self, format: Literal["xhtml", "html"]) -> Markdown: ...
+    def is_block_level(self, tag: str) -> bool: ...
+    def convert(self, source: Text) -> Text: ...
+    def convertFile(
+        self,
+        input: Optional[Union[str, TextIO, BinaryIO]] = ...,
+        output: Optional[Union[str, TextIO, BinaryIO]] = ...,
+        encoding: Optional[str] = ...,
+    ) -> Markdown: ...
+
+def markdown(
+    text: Text,
+    *,
+    extensions: Optional[Sequence[Union[str, Extension]]] = ...,
+    extension_configs: Optional[Mapping[str, Mapping[str, str]]] = ...,
+    output_format: Optional[Literal["xhtml", "html"]] = ...,
+    tab_length: Optional[int] = ...,
+) -> Text: ...
+def markdownFromFile(
+    *,
+    input: Optional[Union[str, TextIO, BinaryIO]] = ...,
+    output: Optional[Union[str, TextIO, BinaryIO]] = ...,
+    encoding: Optional[str] = ...,
+    extensions: Optional[Sequence[Union[str, Extension]]] = ...,
+    extension_configs: Optional[Mapping[str, Mapping[str, str]]] = ...,
+    output_format: Optional[Literal["xhtml", "html"]] = ...,
+    tab_length: Optional[int] = ...,
+) -> None: ...
diff --git a/third_party/2and3/markdown/extensions/__init__.pyi b/third_party/2and3/markdown/extensions/__init__.pyi
new file mode 100644
index 000000000..13905d150
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/__init__.pyi
@@ -0,0 +1,13 @@
+from typing import Mapping, Sequence
+
+from ..core import Markdown
+
+class Extension:
+    config: Mapping[str, str] = ...
+    def __init__(self, **kwargs: Mapping[str, str]) -> None: ...
+    def getConfig(self, key: str, default: str = ...) -> str: ...
+    def getConfigs(self) -> Mapping[str, str]: ...
+    def getConfigInfo(self) -> Sequence[Mapping[str, str]]: ...
+    def setConfig(self, key: str, value: str) -> None: ...
+    def setConfigs(self, items: Mapping[str, str]) -> None: ...
+    def extendMarkdown(self, md: Markdown) -> None: ...