Method filter

background_scripts/completion/completers.js:495–524

({ queryTerms })

// If the query is empty, then return a list of open tabs, sorted by recency.
export class TabCompleter {
  async filter({ queryTerms }) {
    await bgUtils.tabRecency.init();
    // We search all tabs, not just those in the current window.
    const tabs = await chrome.tabs.query({});
    const results = tabs.filter((tab) => ranking.matches(queryTerms, tab.url, tab.title));
    const suggestions = results
      .map((tab) => {
        const suggestion = new Suggestion({
          queryTerms,
          description: "tab",
          url: tab.url,
          title: tab.title,
          tabId: tab.id,
          deDuplicate: false,
        });
        suggestion.relevancy = this.computeRelevancy(suggestion);
        return suggestion;
      })
      .sort((a, b) => b.relevancy - a.relevancy);
    // Boost relevancy with a multiplier so a relevant tab doesn't get crowded out by results from
    // competing completers. To prevent tabs from crowding out everything else in turn, penalize
    // them for being further down the results list by scaling on a hyperbola starting at 1 and
    // approaching 0 asymptotically for higher indexes. The multiplier and the curve fall-off were
    // subjectively chosen on the grounds that they seem to work pretty well.
    suggestions.forEach(function (suggestion, i) {
      suggestion.relevancy *= 8;
      suggestion.relevancy /= (i / 4) + 1;
    });
    return suggestions;
  }

  computeRelevancy(suggestion) {
    if (suggestion.queryTerms.length > 0) {