diff --git a/third_party/2and3/markdown/__meta__.pyi b/third_party/2and3/markdown/__meta__.pyi
new file mode 100644
index 000000000000..4a5eacaf90cb
--- /dev/null
+++ b/third_party/2and3/markdown/__meta__.pyi
@@ -0,0 +1,3 @@
+from typing import Any
+
+__version_info__: Any
diff --git a/third_party/2and3/markdown/blockparser.pyi b/third_party/2and3/markdown/blockparser.pyi
new file mode 100644
index 000000000000..602ecca0b504
--- /dev/null
+++ b/third_party/2and3/markdown/blockparser.pyi
@@ -0,0 +1,18 @@
+from typing import Any
+
+class State(list):
+    def set(self, state) -> None: ...
+    def reset(self) -> None: ...
+    def isstate(self, state): ...
+
+class BlockParser:
+    blockprocessors: Any
+    state: Any
+    md: Any
+    def __init__(self, md) -> None: ...
+    @property
+    def markdown(self): ...
+    root: Any
+    def parseDocument(self, lines): ...
+    def parseChunk(self, parent, text) -> None: ...
+    def parseBlocks(self, parent, blocks) -> None: ...
diff --git a/third_party/2and3/markdown/blockprocessors.pyi b/third_party/2and3/markdown/blockprocessors.pyi
new file mode 100644
index 000000000000..8c78bbe7b57e
--- /dev/null
+++ b/third_party/2and3/markdown/blockprocessors.pyi
@@ -0,0 +1,78 @@
+from typing import Any, Pattern
+
+logger: Any
+
+def build_block_parser(md, **kwargs): ...
+
+class BlockProcessor:
+    parser: Any
+    tab_length: Any
+    def __init__(self, parser) -> None: ...
+    def lastChild(self, parent): ...
+    def detab(self, text): ...
+    def looseDetab(self, text, level: int = ...): ...
+    def test(self, parent, block) -> None: ...
+    def run(self, parent, blocks) -> None: ...
+
+class ListIndentProcessor(BlockProcessor):
+    ITEM_TYPES: Any
+    LIST_TYPES: Any
+    INDENT_RE: Pattern
+    def __init__(self, *args) -> None: ...
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+    def create_item(self, parent, block) -> None: ...
+    def get_level(self, parent, block): ...
+
+class CodeBlockProcessor(BlockProcessor):
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+
+class BlockQuoteProcessor(BlockProcessor):
+    RE: Pattern
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+    def clean(self, line): ...
+
+class OListProcessor(BlockProcessor):
+    TAG: str = ...
+    STARTSWITH: str = ...
+    LAZY_OL: bool = ...
+    SIBLING_TAGS: Any
+    RE: Pattern
+    CHILD_RE: Pattern
+    INDENT_RE: Pattern
+    def __init__(self, parser) -> None: ...
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+    def get_items(self, block): ...
+
+class UListProcessor(OListProcessor):
+    TAG: str = ...
+    RE: Pattern
+    def __init__(self, parser) -> None: ...
+
+class HashHeaderProcessor(BlockProcessor):
+    RE: Pattern
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+
+class SetextHeaderProcessor(BlockProcessor):
+    RE: Pattern
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+
+class HRProcessor(BlockProcessor):
+    RE: str = ...
+    SEARCH_RE: Pattern
+    match: Any
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+
+class EmptyBlockProcessor(BlockProcessor):
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+
+class ParagraphProcessor(BlockProcessor):
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
diff --git a/third_party/2and3/markdown/extensions/__init__.pyi b/third_party/2and3/markdown/extensions/__init__.pyi
index 13905d15032e..eedc24829dc5 100644
--- a/third_party/2and3/markdown/extensions/__init__.pyi
+++ b/third_party/2and3/markdown/extensions/__init__.pyi
@@ -1,6 +1,6 @@
 from typing import Mapping, Sequence
 
-from ..core import Markdown
+from markdown.core import Markdown
 
 class Extension:
     config: Mapping[str, str] = ...
diff --git a/third_party/2and3/markdown/extensions/abbr.pyi b/third_party/2and3/markdown/extensions/abbr.pyi
new file mode 100644
index 000000000000..3655f922311a
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/abbr.pyi
@@ -0,0 +1,20 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.inlinepatterns import InlineProcessor
+from markdown.preprocessors import Preprocessor
+
+ABBR_REF_RE: Pattern
+
+class AbbrExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+class AbbrPreprocessor(Preprocessor):
+    def run(self, lines): ...
+
+class AbbrInlineProcessor(InlineProcessor):
+    title: Any
+    def __init__(self, pattern, title) -> None: ...
+    def handleMatch(self, m, data): ...  # type: ignore
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/admonition.pyi b/third_party/2and3/markdown/extensions/admonition.pyi
new file mode 100644
index 000000000000..9b7ed3ee0622
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/admonition.pyi
@@ -0,0 +1,18 @@
+from typing import Any, Pattern
+
+from markdown.blockprocessors import BlockProcessor
+from markdown.extensions import Extension
+
+class AdmonitionExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+class AdmonitionProcessor(BlockProcessor):
+    CLASSNAME: str = ...
+    CLASSNAME_TITLE: str = ...
+    RE: Pattern
+    RE_SPACES: Any
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+    def get_class_and_title(self, match): ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/attr_list.pyi b/third_party/2and3/markdown/extensions/attr_list.pyi
new file mode 100644
index 000000000000..29c26afd2a43
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/attr_list.pyi
@@ -0,0 +1,22 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.treeprocessors import Treeprocessor
+
+def get_attrs(str): ...
+def isheader(elem): ...
+
+class AttrListTreeprocessor(Treeprocessor):
+    BASE_RE: str = ...
+    HEADER_RE: Pattern
+    BLOCK_RE: Pattern
+    INLINE_RE: Pattern
+    NAME_RE: Pattern
+    def run(self, doc) -> None: ...
+    def assign_attrs(self, elem, attrs) -> None: ...
+    def sanitize_name(self, name): ...
+
+class AttrListExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/codehilite.pyi b/third_party/2and3/markdown/extensions/codehilite.pyi
new file mode 100644
index 000000000000..8b1eb461d8a4
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/codehilite.pyi
@@ -0,0 +1,45 @@
+from typing import Any, Optional
+
+from markdown.extensions import Extension
+from markdown.treeprocessors import Treeprocessor
+
+pygments: bool
+
+def parse_hl_lines(expr): ...
+
+class CodeHilite:
+    src: Any
+    lang: Any
+    linenums: Any
+    guess_lang: Any
+    css_class: Any
+    style: Any
+    noclasses: Any
+    tab_length: Any
+    hl_lines: Any
+    use_pygments: Any
+    def __init__(
+        self,
+        src: Optional[Any] = ...,
+        linenums: Optional[Any] = ...,
+        guess_lang: bool = ...,
+        css_class: str = ...,
+        lang: Optional[Any] = ...,
+        style: str = ...,
+        noclasses: bool = ...,
+        tab_length: int = ...,
+        hl_lines: Optional[Any] = ...,
+        use_pygments: bool = ...,
+    ) -> None: ...
+    def hilite(self): ...
+
+class HiliteTreeprocessor(Treeprocessor):
+    def code_unescape(self, text): ...
+    def run(self, root) -> None: ...
+
+class CodeHiliteExtension(Extension):
+    config: Any
+    def __init__(self, **kwargs) -> None: ...
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/def_list.pyi b/third_party/2and3/markdown/extensions/def_list.pyi
new file mode 100644
index 000000000000..1aa70d29f4b2
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/def_list.pyi
@@ -0,0 +1,20 @@
+from typing import Any, Pattern
+
+from markdown.blockprocessors import BlockProcessor, ListIndentProcessor
+from markdown.extensions import Extension
+
+class DefListProcessor(BlockProcessor):
+    RE: Pattern
+    NO_INDENT_RE: Pattern
+    def test(self, parent, block): ...
+    def run(self, parent, blocks): ...
+
+class DefListIndentProcessor(ListIndentProcessor):
+    ITEM_TYPES: Any
+    LIST_TYPES: Any
+    def create_item(self, parent, block) -> None: ...
+
+class DefListExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/extra.pyi b/third_party/2and3/markdown/extensions/extra.pyi
new file mode 100644
index 000000000000..4c658270ce6c
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/extra.pyi
@@ -0,0 +1,12 @@
+from typing import Any
+
+from markdown.extensions import Extension
+
+extensions: Any
+
+class ExtraExtension(Extension):
+    config: Any
+    def __init__(self, **kwargs) -> None: ...
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/fenced_code.pyi b/third_party/2and3/markdown/extensions/fenced_code.pyi
new file mode 100644
index 000000000000..9afedc4f2d08
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/fenced_code.pyi
@@ -0,0 +1,18 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.preprocessors import Preprocessor
+
+class FencedCodeExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+class FencedBlockPreprocessor(Preprocessor):
+    FENCED_BLOCK_RE: Pattern
+    CODE_WRAP: str = ...
+    LANG_TAG: str = ...
+    checked_for_codehilite: bool = ...
+    codehilite_conf: Any
+    def __init__(self, md) -> None: ...
+    def run(self, lines): ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/footnotes.pyi b/third_party/2and3/markdown/extensions/footnotes.pyi
new file mode 100644
index 000000000000..5e8e50d54be3
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/footnotes.pyi
@@ -0,0 +1,64 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.inlinepatterns import InlineProcessor
+from markdown.postprocessors import Postprocessor
+from markdown.preprocessors import Preprocessor
+from markdown.treeprocessors import Treeprocessor
+
+FN_BACKLINK_TEXT: Any
+NBSP_PLACEHOLDER: Any
+DEF_RE: Pattern
+TABBED_RE: Pattern
+RE_REF_ID: Any
+
+class FootnoteExtension(Extension):
+    config: Any
+    unique_prefix: int = ...
+    found_refs: Any
+    used_refs: Any
+    def __init__(self, **kwargs) -> None: ...
+    parser: Any
+    md: Any
+    def extendMarkdown(self, md) -> None: ...
+    footnotes: Any
+    def reset(self) -> None: ...
+    def unique_ref(self, reference, found: bool = ...): ...
+    def findFootnotesPlaceholder(self, root): ...
+    def setFootnote(self, id, text) -> None: ...
+    def get_separator(self): ...
+    def makeFootnoteId(self, id): ...
+    def makeFootnoteRefId(self, id, found: bool = ...): ...
+    def makeFootnotesDiv(self, root): ...
+
+class FootnotePreprocessor(Preprocessor):
+    footnotes: Any
+    def __init__(self, footnotes) -> None: ...
+    def run(self, lines): ...
+    def detectTabbed(self, lines): ...
+
+class FootnoteInlineProcessor(InlineProcessor):
+    footnotes: Any
+    def __init__(self, pattern, footnotes) -> None: ...
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class FootnotePostTreeprocessor(Treeprocessor):
+    footnotes: Any
+    def __init__(self, footnotes) -> None: ...
+    def add_duplicates(self, li, duplicates) -> None: ...
+    def get_num_duplicates(self, li): ...
+    def handle_duplicates(self, parent) -> None: ...
+    offset: int = ...
+    def run(self, root) -> None: ...
+
+class FootnoteTreeprocessor(Treeprocessor):
+    footnotes: Any
+    def __init__(self, footnotes) -> None: ...
+    def run(self, root) -> None: ...
+
+class FootnotePostprocessor(Postprocessor):
+    footnotes: Any
+    def __init__(self, footnotes) -> None: ...
+    def run(self, text): ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/legacy_attrs.pyi b/third_party/2and3/markdown/extensions/legacy_attrs.pyi
new file mode 100644
index 000000000000..ab76addaa2ab
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/legacy_attrs.pyi
@@ -0,0 +1,15 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.treeprocessors import Treeprocessor
+
+ATTR_RE: Pattern
+
+class LegacyAttrs(Treeprocessor):
+    def run(self, doc) -> None: ...
+    def handleAttributes(self, el, txt): ...
+
+class LegacyAttrExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/legacy_em.pyi b/third_party/2and3/markdown/extensions/legacy_em.pyi
new file mode 100644
index 000000000000..55847cf9dcc3
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/legacy_em.pyi
@@ -0,0 +1,16 @@
+from typing import Any
+
+from markdown.extensions import Extension
+from markdown.inlinepatterns import UnderscoreProcessor
+
+EMPHASIS_RE: str
+STRONG_RE: str
+STRONG_EM_RE: str
+
+class LegacyUnderscoreProcessor(UnderscoreProcessor):
+    PATTERNS: Any
+
+class LegacyEmExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/md_in_html.pyi b/third_party/2and3/markdown/extensions/md_in_html.pyi
new file mode 100644
index 000000000000..99f19773db53
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/md_in_html.pyi
@@ -0,0 +1,13 @@
+from typing import Any, Optional
+
+from markdown.blockprocessors import BlockProcessor
+from markdown.extensions import Extension
+
+class MarkdownInHtmlProcessor(BlockProcessor):
+    def test(self, parent, block): ...
+    def run(self, parent, blocks, tail: Optional[Any] = ..., nest: bool = ...) -> None: ...
+
+class MarkdownInHtmlExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/meta.pyi b/third_party/2and3/markdown/extensions/meta.pyi
new file mode 100644
index 000000000000..5277a0347e99
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/meta.pyi
@@ -0,0 +1,20 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.preprocessors import Preprocessor
+
+log: Any
+META_RE: Pattern
+META_MORE_RE: Pattern
+BEGIN_RE: Pattern
+END_RE: Pattern
+
+class MetaExtension(Extension):
+    md: Any
+    def extendMarkdown(self, md) -> None: ...
+    def reset(self) -> None: ...
+
+class MetaPreprocessor(Preprocessor):
+    def run(self, lines): ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/nl2br.pyi b/third_party/2and3/markdown/extensions/nl2br.pyi
new file mode 100644
index 000000000000..ff8f6bf3226b
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/nl2br.pyi
@@ -0,0 +1,10 @@
+from typing import Any
+
+from markdown.extensions import Extension
+
+BR_RE: str
+
+class Nl2BrExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/sane_lists.pyi b/third_party/2and3/markdown/extensions/sane_lists.pyi
new file mode 100644
index 000000000000..bf274bfba68f
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/sane_lists.pyi
@@ -0,0 +1,20 @@
+from typing import Any, Pattern
+
+from markdown.blockprocessors import OListProcessor, UListProcessor
+from markdown.extensions import Extension
+
+class SaneOListProcessor(OListProcessor):
+    SIBLING_TAGS: Any
+    LAZY_OL: bool = ...
+    CHILD_RE: Pattern
+    def __init__(self, parser) -> None: ...
+
+class SaneUListProcessor(UListProcessor):
+    SIBLING_TAGS: Any
+    CHILD_RE: Pattern
+    def __init__(self, parser) -> None: ...
+
+class SaneListExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/smarty.pyi b/third_party/2and3/markdown/extensions/smarty.pyi
new file mode 100644
index 000000000000..3bbf0fde998b
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/smarty.pyi
@@ -0,0 +1,45 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.inlinepatterns import HtmlInlineProcessor
+
+punctClass: str
+endOfWordClass: str
+closeClass: str
+openingQuotesBase: str
+substitutions: Any
+singleQuoteStartRe: Any
+doubleQuoteStartRe: Any
+doubleQuoteSetsRe: str
+singleQuoteSetsRe: str
+decadeAbbrRe: str
+openingDoubleQuotesRegex: Any
+closingDoubleQuotesRegex: str
+closingDoubleQuotesRegex2: Any
+openingSingleQuotesRegex: Any
+closingSingleQuotesRegex: Any
+closingSingleQuotesRegex2: Any
+remainingSingleQuotesRegex: str
+remainingDoubleQuotesRegex: str
+HTML_STRICT_RE: str
+
+class SubstituteTextPattern(HtmlInlineProcessor):
+    replace: Any
+    md: Any
+    def __init__(self, pattern, replace, md) -> None: ...
+    @property
+    def markdown(self): ...
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class SmartyExtension(Extension):
+    config: Any
+    substitutions: Any
+    def __init__(self, **kwargs) -> None: ...
+    def educateDashes(self, md) -> None: ...
+    def educateEllipses(self, md) -> None: ...
+    def educateAngledQuotes(self, md) -> None: ...
+    def educateQuotes(self, md) -> None: ...
+    inlinePatterns: Any
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/tables.pyi b/third_party/2and3/markdown/extensions/tables.pyi
new file mode 100644
index 000000000000..700dfa0f8db7
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/tables.pyi
@@ -0,0 +1,22 @@
+from typing import Any
+
+from markdown.blockprocessors import BlockProcessor
+from markdown.extensions import Extension
+
+PIPE_NONE: int
+PIPE_LEFT: int
+PIPE_RIGHT: int
+
+class TableProcessor(BlockProcessor):
+    RE_CODE_PIPES: Any
+    RE_END_BORDER: Any
+    border: bool = ...
+    separator: str = ...
+    def __init__(self, parser) -> None: ...
+    def test(self, parent, block): ...
+    def run(self, parent, blocks) -> None: ...
+
+class TableExtension(Extension):
+    def extendMarkdown(self, md) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/toc.pyi b/third_party/2and3/markdown/extensions/toc.pyi
new file mode 100644
index 000000000000..cf4e92eadd53
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/toc.pyi
@@ -0,0 +1,47 @@
+from typing import Any, Pattern
+
+from markdown.extensions import Extension
+from markdown.treeprocessors import Treeprocessor
+
+def slugify(value, separator): ...
+
+IDCOUNT_RE: Pattern
+
+def unique(id, ids): ...
+def get_name(el): ...
+def stashedHTML2text(text, md, strip_entities: bool = ...): ...
+def unescape(text): ...
+def nest_toc_tokens(toc_list): ...
+
+class TocTreeprocessor(Treeprocessor):
+    marker: Any
+    title: Any
+    base_level: Any
+    slugify: Any
+    sep: Any
+    use_anchors: Any
+    anchorlink_class: Any
+    use_permalinks: Any
+    permalink_class: Any
+    permalink_title: Any
+    header_rgx: Any
+    toc_top: int = ...
+    toc_bottom: Any
+    def __init__(self, md, config) -> None: ...
+    def iterparent(self, node) -> None: ...
+    def replace_marker(self, root, elem) -> None: ...
+    def set_level(self, elem) -> None: ...
+    def add_anchor(self, c, elem_id) -> None: ...
+    def add_permalink(self, c, elem_id) -> None: ...
+    def build_toc_div(self, toc_list): ...
+    def run(self, doc) -> None: ...
+
+class TocExtension(Extension):
+    TreeProcessorClass: Any
+    config: Any
+    def __init__(self, **kwargs) -> None: ...
+    md: Any
+    def extendMarkdown(self, md) -> None: ...
+    def reset(self) -> None: ...
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/extensions/wikilinks.pyi b/third_party/2and3/markdown/extensions/wikilinks.pyi
new file mode 100644
index 000000000000..26cc954c999f
--- /dev/null
+++ b/third_party/2and3/markdown/extensions/wikilinks.pyi
@@ -0,0 +1,19 @@
+from typing import Any
+
+from markdown.extensions import Extension
+from markdown.inlinepatterns import InlineProcessor
+
+def build_url(label, base, end): ...
+
+class WikiLinkExtension(Extension):
+    config: Any
+    def __init__(self, **kwargs) -> None: ...
+    md: Any
+    def extendMarkdown(self, md) -> None: ...
+
+class WikiLinksInlineProcessor(InlineProcessor):
+    config: Any
+    def __init__(self, pattern, config) -> None: ...
+    def handleMatch(self, m, data): ...  # type: ignore
+
+def makeExtension(**kwargs): ...
diff --git a/third_party/2and3/markdown/inlinepatterns.pyi b/third_party/2and3/markdown/inlinepatterns.pyi
new file mode 100644
index 000000000000..a5095700a2de
--- /dev/null
+++ b/third_party/2and3/markdown/inlinepatterns.pyi
@@ -0,0 +1,134 @@
+from typing import Any, Optional
+
+def build_inlinepatterns(md, **kwargs): ...
+
+NOIMG: str
+BACKTICK_RE: str
+ESCAPE_RE: str
+EMPHASIS_RE: str
+STRONG_RE: str
+SMART_STRONG_RE: str
+SMART_EMPHASIS_RE: str
+SMART_STRONG_EM_RE: str
+EM_STRONG_RE: str
+EM_STRONG2_RE: str
+STRONG_EM_RE: str
+STRONG_EM2_RE: str
+STRONG_EM3_RE: str
+LINK_RE: str
+IMAGE_LINK_RE: str
+REFERENCE_RE: str
+IMAGE_REFERENCE_RE: str
+NOT_STRONG_RE: str
+AUTOLINK_RE: str
+AUTOMAIL_RE: str
+HTML_RE: str
+ENTITY_RE: str
+LINE_BREAK_RE: str
+
+def dequote(string): ...
+
+class EmStrongItem: ...
+
+class Pattern:
+    ANCESTOR_EXCLUDES: Any
+    pattern: Any
+    compiled_re: Any
+    md: Any
+    def __init__(self, pattern, md: Optional[Any] = ...) -> None: ...
+    @property
+    def markdown(self): ...
+    def getCompiledRegExp(self): ...
+    def handleMatch(self, m) -> None: ...
+    def type(self): ...
+    def unescape(self, text): ...
+
+class InlineProcessor(Pattern):
+    pattern: Any
+    compiled_re: Any
+    safe_mode: bool = ...
+    md: Any
+    def __init__(self, pattern, md: Optional[Any] = ...) -> None: ...
+    def handleMatch(self, m, data) -> None: ...  # type: ignore
+
+class SimpleTextPattern(Pattern):
+    def handleMatch(self, m): ...
+
+class SimpleTextInlineProcessor(InlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class EscapeInlineProcessor(InlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class SimpleTagPattern(Pattern):
+    tag: Any
+    def __init__(self, pattern, tag) -> None: ...
+    def handleMatch(self, m): ...
+
+class SimpleTagInlineProcessor(InlineProcessor):
+    tag: Any
+    def __init__(self, pattern, tag) -> None: ...
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class SubstituteTagPattern(SimpleTagPattern):
+    def handleMatch(self, m): ...
+
+class SubstituteTagInlineProcessor(SimpleTagInlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class BacktickInlineProcessor(InlineProcessor):
+    ESCAPED_BSLASH: Any
+    tag: str = ...
+    def __init__(self, pattern) -> None: ...
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class DoubleTagPattern(SimpleTagPattern):
+    def handleMatch(self, m): ...
+
+class DoubleTagInlineProcessor(SimpleTagInlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class HtmlInlineProcessor(InlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
+    def unescape(self, text): ...
+
+class AsteriskProcessor(InlineProcessor):
+    PATTERNS: Any
+    def build_single(self, m, tag, idx): ...
+    def build_double(self, m, tags, idx): ...
+    def build_double2(self, m, tags, idx): ...
+    def parse_sub_patterns(self, data, parent, last, idx) -> None: ...
+    def build_element(self, m, builder, tags, index): ...
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class UnderscoreProcessor(AsteriskProcessor):
+    PATTERNS: Any
+
+class LinkInlineProcessor(InlineProcessor):
+    RE_LINK: Any
+    RE_TITLE_CLEAN: Any
+    def handleMatch(self, m, data): ...  # type: ignore
+    def getLink(self, data, index): ...
+    def getText(self, data, index): ...
+
+class ImageInlineProcessor(LinkInlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class ReferenceInlineProcessor(LinkInlineProcessor):
+    NEWLINE_CLEANUP_RE: Pattern
+    RE_LINK: Any
+    def handleMatch(self, m, data): ...  # type: ignore
+    def evalId(self, data, index, text): ...
+    def makeTag(self, href, title, text): ...
+
+class ShortReferenceInlineProcessor(ReferenceInlineProcessor):
+    def evalId(self, data, index, text): ...
+
+class ImageReferenceInlineProcessor(ReferenceInlineProcessor):
+    def makeTag(self, href, title, text): ...
+
+class AutolinkInlineProcessor(InlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
+
+class AutomailInlineProcessor(InlineProcessor):
+    def handleMatch(self, m, data): ...  # type: ignore
diff --git a/third_party/2and3/markdown/pep562.pyi b/third_party/2and3/markdown/pep562.pyi
new file mode 100644
index 000000000000..398bf66b8313
--- /dev/null
+++ b/third_party/2and3/markdown/pep562.pyi
@@ -0,0 +1,9 @@
+from typing import Any
+
+class Version:
+    def __new__(cls, major, minor, micro, release: str = ..., pre: int = ..., post: int = ..., dev: int = ...): ...
+
+class Pep562:
+    def __init__(self, name) -> None: ...
+    def __dir__(self): ...
+    def __getattr__(self, name): ...
diff --git a/third_party/2and3/markdown/postprocessors.pyi b/third_party/2and3/markdown/postprocessors.pyi
new file mode 100644
index 000000000000..a7ef53572ecb
--- /dev/null
+++ b/third_party/2and3/markdown/postprocessors.pyi
@@ -0,0 +1,20 @@
+from typing import Any, Pattern
+
+from . import util
+
+def build_postprocessors(md, **kwargs): ...
+
+class Postprocessor(util.Processor):
+    def run(self, text) -> None: ...
+
+class RawHtmlPostprocessor(Postprocessor):
+    def run(self, text): ...
+    def isblocklevel(self, html): ...
+
+class AndSubstitutePostprocessor(Postprocessor):
+    def run(self, text): ...
+
+class UnescapePostprocessor(Postprocessor):
+    RE: Pattern
+    def unescape(self, m): ...
+    def run(self, text): ...
diff --git a/third_party/2and3/markdown/preprocessors.pyi b/third_party/2and3/markdown/preprocessors.pyi
new file mode 100644
index 000000000000..c29b6ab59623
--- /dev/null
+++ b/third_party/2and3/markdown/preprocessors.pyi
@@ -0,0 +1,26 @@
+from typing import Any, Pattern
+
+from . import util
+
+def build_preprocessors(md, **kwargs): ...
+
+class Preprocessor(util.Processor):
+    def run(self, lines) -> None: ...
+
+class NormalizeWhitespace(Preprocessor):
+    def run(self, lines): ...
+
+class HtmlBlockPreprocessor(Preprocessor):
+    right_tag_patterns: Any
+    attrs_pattern: str = ...
+    left_tag_pattern: Any
+    attrs_re: Any
+    left_tag_re: Any
+    markdown_in_raw: bool = ...
+    def run(self, lines): ...
+
+class ReferencePreprocessor(Preprocessor):
+    TITLE: str = ...
+    RE: Pattern
+    TITLE_RE: Pattern
+    def run(self, lines): ...
diff --git a/third_party/2and3/markdown/serializers.pyi b/third_party/2and3/markdown/serializers.pyi
new file mode 100644
index 000000000000..cdad4b1b613d
--- /dev/null
+++ b/third_party/2and3/markdown/serializers.pyi
@@ -0,0 +1,4 @@
+from typing import Any
+
+def to_html_string(element): ...
+def to_xhtml_string(element): ...
diff --git a/third_party/2and3/markdown/treeprocessors.pyi b/third_party/2and3/markdown/treeprocessors.pyi
new file mode 100644
index 000000000000..f05cd795c73f
--- /dev/null
+++ b/third_party/2and3/markdown/treeprocessors.pyi
@@ -0,0 +1,23 @@
+from typing import Any, Optional
+
+from . import util
+
+def build_treeprocessors(md, **kwargs): ...
+def isString(s): ...
+
+class Treeprocessor(util.Processor):
+    def run(self, root) -> None: ...
+
+class InlineProcessor(Treeprocessor):
+    md: Any
+    inlinePatterns: Any
+    ancestors: Any
+    def __init__(self, md) -> None: ...
+    @property
+    def markdown(self): ...
+    stashed_nodes: Any
+    parent_map: Any
+    def run(self, tree, ancestors: Optional[Any] = ...): ...
+
+class PrettifyTreeprocessor(Treeprocessor):
+    def run(self, root) -> None: ...
diff --git a/third_party/2and3/markdown/util.pyi b/third_party/2and3/markdown/util.pyi
new file mode 100644
index 000000000000..170fadf43494
--- /dev/null
+++ b/third_party/2and3/markdown/util.pyi
@@ -0,0 +1,58 @@
+from collections import namedtuple
+from typing import Any, Optional, Pattern
+
+PY37: Any
+__deprecated__: Any
+BLOCK_LEVEL_ELEMENTS: Any
+STX: str
+ETX: str
+INLINE_PLACEHOLDER_PREFIX: Any
+INLINE_PLACEHOLDER: Any
+INLINE_PLACEHOLDER_RE: Pattern
+AMP_SUBSTITUTE: Any
+HTML_PLACEHOLDER: Any
+HTML_PLACEHOLDER_RE: Pattern
+TAG_PLACEHOLDER: Any
+INSTALLED_EXTENSIONS: Any
+RTL_BIDI_RANGES: Any
+
+def deprecated(message, stacklevel: int = ...): ...
+def isBlockLevel(tag): ...
+def parseBoolValue(value, fail_on_errors: bool = ..., preserve_none: bool = ...): ...
+def code_escape(text): ...
+
+class AtomicString(str): ...
+
+class Processor:
+    md: Any
+    def __init__(self, md: Optional[Any] = ...) -> None: ...
+    @property
+    def markdown(self): ...
+
+class HtmlStash:
+    html_counter: int = ...
+    rawHtmlBlocks: Any
+    tag_counter: int = ...
+    tag_data: Any
+    def __init__(self) -> None: ...
+    def store(self, html): ...
+    def reset(self) -> None: ...
+    def get_placeholder(self, key): ...
+    def store_tag(self, tag, attrs, left_index, right_index): ...
+
+_PriorityItem = namedtuple("PriorityItem", ["name", "priority"])
+
+class Registry:
+    def __init__(self) -> None: ...
+    def __contains__(self, item): ...
+    def __iter__(self) -> Any: ...
+    def __getitem__(self, key): ...
+    def __len__(self): ...
+    def get_index_for_name(self, name): ...
+    def register(self, item, name, priority) -> None: ...
+    def deregister(self, name, strict: bool = ...) -> None: ...
+    def __setitem__(self, key, value) -> None: ...
+    def __delitem__(self, key) -> None: ...
+    def add(self, key, value, location) -> None: ...
+
+def __getattr__(name): ...