Simple function that looks for unique words prefixed by something and prints them sorted as a TypeScript union

getPrefixedStringsAsUnion.js

/**
 * Simple function that looks for unique words prefixed by something and prints them sorted as a TypeScript union
 
 * Usage: getPrefixedNamesAsUnion(`.icon-alert{color: white}.icon-arrow{color: red}`, '.icon-');
 * Output: 'alert' | 'arrow'
 */
getPrefixedStringsAsUnion = (str, prefix) => {
  const escapedPrefix = prefix.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
  const matches = [...str.matchAll(RegExp(`(?<=${escapedPrefix})[a-zA-Z0-9-_]+`, 'g'))].map((s) => s[0]);
  const sortedUniqueStrings = [...new Set(matches)].sort((a, b) => a.localeCompare(b));
  sortedUniqueStrings.sort((a, b) => a.localeCompare(b));
  const union = [...sortedUniqueStrings].reduce((acc, name) => `${acc}| '${name}'\n`, '');
  console.log(union);
};