Identify markdown by comments

Description

const html = `<!-- markdown -->
# hello
`

Contributor guide

Tech stack

javascript

Domain

build system

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

half day

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

mostly clear

Prerequisites

JavaScriptBabel plugin APIHTML comment parsing

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

40

Research direction

First, examine the plugin's source code (likely index.js) to understand how it currently detects and transforms markdown in JavaScript files. Then, implement a check for HTML comments containing ' markdown ' (e.g., `<! markdown >`) and treat the content inside as markdown. Review existing tests in the repository to ensure no regressions. Consider if the comment detection should be configurable. The change is localized but requires familiarity with Babel's AST manipulation.