Remark and rehype plugins (#562)

* remark plugins

* remove unused dependency

* enable codeblocks

* backward compatibility with remark-code-titles

* add support for rehype plugins

* add proper types for plugins

* fixes after review

- connect plugins by name
- make plugins configurable
- connect gfm and footnotes if no plugins provided from config
- add more plugins to example

* update and rename example

* add documentation for markdown plugins

* chore: rename with-markdown-plugins example

* chore: restructure dependencies

* feat: add back smartypants, fix mdx expressions

* chore: remove log

* test: add markdown plugin tests

* chore: add changeset

* docs: update markdown doc

Co-authored-by: Nate Moore <nate@skypack.dev>

1 files changed, 19 insertions, 0 deletions

diff --git a/packages/markdown-support/src/remark-expressions.ts b/packages/markdown-support/src/remark-expressions.ts
new file mode 100644
index 000000000..1cdb37894
--- /dev/null
+++ b/packages/markdown-support/src/remark-expressions.ts
@@ -0,0 +1,19 @@
+import {mdxExpression} from 'micromark-extension-mdx-expression'
+import {mdxExpressionFromMarkdown, mdxExpressionToMarkdown} from 'mdast-util-mdx-expression'
+
+function remarkExpressions(this: any, options: any) {
+  let settings = options || {}
+  let data = this.data()
+
+  add('micromarkExtensions', mdxExpression({}))
+  add('fromMarkdownExtensions', mdxExpressionFromMarkdown)
+  add('toMarkdownExtensions', mdxExpressionToMarkdown)
+
+  function add(field: any, value: any) {
+    /* istanbul ignore if - other extensions. */
+    if (data[field]) data[field].push(value)
+    else data[field] = [value]
+  }
+}
+
+export default remarkExpressions;