Upgrade to remark-parse@9+

[TrevorBurnham]

Prettier currently uses remark-parse@8 to parse Markdown/MDX. remark-parse@9 was released on Oct 14, 2020, switching it over to micromark: remarkjs/remark#536

Upgrading Prettier to remark-parse@9 (or newer) would fix the following reported bugs with Markdown parsing, and possibly others:

• Markdown: Link text converted to lower-case #3835
• Paragraph starting with a decimal number is moved into preceding list (MDX) #11332

This is a non-trivial task because micromark uses a completely different plugin API, so all of Prettier's Markdown plugins will need to be updated or replaced.

[TrevorBurnham]

I've opened up a WIP branch that uses the latest remark-parse: #11867 I'm hoping that other contributors will jump in and help get the plugins updated to use the new API. cc @sarayourfriend @fisker

[fisker]

Removed from v3 milestone, we'll continue work on it after v3 release.

[queengooborg]

Hey there, I'm hoping to see if there's any progress on this issue. This is unfortunately a critical bug that is preventing us from properly adopting Prettier for all of MDN Web Docs documentation (especially in the localized content).

The issue I mentioned in #15032 is only one part of the problem. We're also running into issues with underscores/asterisks inside of links being replaced with the opposite symbol (which is a MUCH worse issue).

[seiyab]

I'm trying to upgrade remark-parse.
I have trouble with math syntax. Latest remark-parse and remark-math looks to parse some math-like code differently from before and desired escapes for $ look complex. I wonder if we can drop support for single-$ math since it tend to appear unintentionally #6213 (comment).

Re-implementing some in-house plugins like liquid and frontmatter looks feasible.

[seiyab]

Maybe latest remark-math has a regression bug: micromark/micromark-extension-math#6 Actually it is an intentional breaking change.

[seiyab]

A micromark member also suggests turning singleDollerTextMath off micromark/micromark-extension-math#6 (comment). Or, I'll try to implement our own plugin to keep current behavior.