[TS migration] Migrate 'markdown.js' test to TypeScript

[melvin-bot]

TypeScript migration

Make sure you read through our TypeScript's style guide, cheatsheet and PropTypes conversion table before you start working on this migration issue.

Files

Path	Dependencies
tests/e2e/compare/output/markdown.js	6

[melvin-bot]

This issue has not been updated in over 15 days. eroding to Monthly issue.

P.S. Is everyone reading this sure this is really a near-term priority? Be brave: if you disagree, go ahead and close it out. If someone disagrees, they'll reopen it, and if they don't: one less thing to do!

[melvin-bot]

@melvin-bot[bot], this Monthly task hasn't been acted upon in 6 weeks; closing.

If you disagree, feel encouraged to reopen it -- but pick your least important issue to close instead.