Add MDX parsing rules from errata-ai

Author: anaxite

.vale.ini

@@ -4,7 +4,7 @@ Vocab = Docs
 
 MinAlertLevel = suggestion
 
-Packages = Google, alex, Joblint
+Packages = MDX, Google, alex, Joblint
 
 [*.{md,mdx}]
 BasedOnStyles = Vale, Google, alex, Joblint

styles/.vale-config/0-MDX.ini

@@ -0,0 +1,21 @@
+[formats]
+mdx = md
+
+[*.mdx]
+CommentDelimiters = {/*, */}
+
+# Exclude:
+#
+# `import ...`, `export ...`
+# `<Component ... />`
+# `<Component>...</Component>`
+# `{ ... }`
+TokenIgnores = (?sm)((?:import|export) .+?$), \
+(?<!`)(<\w+ ?.+ ?\/>)(?!`), \
+(<[A-Z]\w+>.+?<\/[A-Z]\w+>)
+
+# Exclude:
+#
+# `<Component \n ... />`
+BlockIgnores = (?sm)^(<\w+\n .*\s\/>)$, \
+(?sm)^({.+.*})