text: "use strict";
  
  const util = require("util");
  
  module.exports = function() {
    return function getEmojiUrl(c, size, pixelRatio) {
      /*
       Resolves Facebook Messenger emoji image asset URL for an emoji character.
       Supported sizes are 32, 64, and 128.
       Supported pixel ratios are '1.0' and '1.5' (possibly more; haven't tested)
       */
      const baseUrl = "https://static.xx.fbcdn.net/images/emoji.php/v8/z%s/%s";
      pixelRatio = pixelRatio || "1.0";
  
      let ending = util.format(
        "%s/%s/%s.png",
        pixelRatio,
        size,
        c.codePointAt(0).toString(16)
      );
      let base = 317426846;
      for (let i = 0; i < ending.length; i++) {
        base = (base << 5) - base + ending.charCodeAt(i);
      }
  
      let hashed = (base & 255).toString(16);
      return util.format(baseUrl, hashed, ending);
    };
  };
  