code: function _convertUnicode(originalStr) {
    let m;
    let c;
    let cStr;
    let lastI = 0;
  
    // Matches \u#### but not \\u####
    const unicodeRegex = /\\u[0-9a-fA-F]{4}/g;
  
    let convertedStr = '';
    while ((m = unicodeRegex.exec(originalStr))) {
      // Don't convert if the backslash itself is escaped
      if (originalStr[m.index - 1] === '\\') {
        continue;
      }
  
      try {
        cStr = m[0].slice(2); // Trim off start
        c = String.fromCharCode(parseInt(cStr, 16));
        if (c === '"') {
          // Escape it if it's double quotes
          c = `\\${c}`;
        }
  
        // + 1 to account for first matched (non-backslash) character
        convertedStr += originalStr.slice(lastI, m.index) + c;
        lastI = m.index + m[0].length;
      } catch (err) {
        // Some reason we couldn't convert a char. Should never actually happen
        console.warn('Failed to convert unicode char', m[0], err);
      }
    }
  
    // Finally, add the rest of the string to the end.
    convertedStr += originalStr.slice(lastI, originalStr.length);
  
    return convertedStr;
  }
docs: Convert escaped unicode characters to real characters. Any JSON parser will do this by
  default. This is really fast too. Around 25ms for ~2MB of data with LOTS of unicode.
  
  @param originalStr
  @returns {string}
  @private