remark-reading-time.mjs

import getReadingTime from 'reading-time';
import { toString } from 'mdast-util-to-string';

export function remarkReadingTime() {
	return function (tree, { data }) {
		const textOnPage = toString(tree);
		const readingTime = getReadingTime(textOnPage);
		// readingTime.text will give us minutes read as a friendly string,
		// i.e. "3 min read"
		// data.astro.frontmatter.minutesRead = Math.ceil(readingTime.minutes.toFixed(2))
		data.astro.frontmatter.minutesRead = Math.ceil(readingTime.minutes);
	};
}