utils/normalize.js

/**
 * Normalize a Wikipedia article title for use as a cache key/filename
 *
 * @param {string} title - Wikipedia article title
 * @returns {string} - Normalized title safe for filenames
 */
export function normalizeTitle( title ) {
	return title
		.toLowerCase()
		.replace( / /g, '-' )
		.replace( /[^a-z0-9-]/g, '' )
		.substring( 0, 100 );
}