@wordpress/blocks/build-module/api/raw-handling/markdown-converter.js

Block API for WordPress.

/**
 * External dependencies
 */
import showdown from 'showdown';

// Reuse the same showdown converter.
const converter = new showdown.Converter({
  noHeaderId: true,
  tables: true,
  literalMidWordUnderscores: true,
  omitExtraWLInCodeBlocks: true,
  simpleLineBreaks: true,
  strikethrough: true
});

/**
 * Corrects the Slack Markdown variant of the code block.
 * If uncorrected, it will be converted to inline code.
 *
 * @see https://get.slack.help/hc/en-us/articles/202288908-how-can-i-add-formatting-to-my-messages-#code-blocks
 *
 * @param {string} text The potential Markdown text to correct.
 *
 * @return {string} The corrected Markdown.
 */
function slackMarkdownVariantCorrector(text) {
  return text.replace(/((?:^|\n)```)([^\n`]+)(```(?:$|\n))/, (match, p1, p2, p3) => `${p1}\n${p2}\n${p3}`);
}
function bulletsToAsterisks(text) {
  return text.replace(/(^|\n)•( +)/g, '$1*$2');
}

/**
 * Converts a piece of text into HTML based on any Markdown present.
 * Also decodes any encoded HTML.
 *
 * @param {string} text The plain text to convert.
 *
 * @return {string} HTML.
 */
export default function markdownConverter(text) {
  return converter.makeHtml(slackMarkdownVariantCorrector(bulletsToAsterisks(text)));
}
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