@atlaskit/global-search/dist/esm/util/autocomplete.js

A cross-product search component (batteries included)

import memoizeOne from 'memoize-one';
export var getAutocompleteText = memoizeOne(function (query, autocompleteSuggestions) {
  if (!autocompleteSuggestions || query.length === 0) {
    return undefined;
  }

  if (autocompleteSuggestions.length === 0) {
    return query;
  }

  var lowerCaseQuery = query.toLowerCase();
  var match = autocompleteSuggestions.find(function (suggestion) {
    return suggestion.toLowerCase().startsWith(lowerCaseQuery);
  });

  if (!match) {
    return query;
  }

  return "".concat(query).concat(match.slice(query.length));
});