Function getCommonPrefix

src/utils.js:239–253

(items)

 * @returns {string} common prefix
 */
const getCommonPrefix = (items) => {
  let [prefix] = items;

  for (let i = 1; i < items.length; i++) {
    const item = items[i];
    for (let prefixIndex = 0; prefixIndex < prefix.length; prefixIndex++) {
      if (item[prefixIndex] !== prefix[prefixIndex]) {
        prefix = prefix.slice(0, prefixIndex);
        break;
      }
    }
  }

  return prefix;
};

/**
 * @param {string[]} items items