old_contents: /*
  PDFNameTree - represents a name tree object
  */
  
  import PDFObject from './object';
  
  class PDFNameTree {
  
     constructor() {
      this._items = {};
    }
  
     add(key, val) {
      return this._items[key] = val;
    }
  
     get(key) {
      return this._items[key];
    }
  
     toString() {
      // Needs to be sorted by key
      const sortedKeys = (Object.keys(this._items)).sort((a, b) => a.localeCompare(b));
  
      const out = ['<<'];
      if (sortedKeys.length > 1) {
        const first = sortedKeys[0], last = sortedKeys[sortedKeys.length - 1];
        out.push(`  /Limits ${PDFObject.convert([new String(first), new String(last)])}`);
      }
      out.push('  /Names [');
      for (let key of sortedKeys) {
        out.push(`    ${PDFObject.convert(new String(key))} ${PDFObject.convert(this._items[key])}`);
      }
      out.push(']');
      out.push('>>');
      return out.join('\n');
    }
   }
  
  export default PDFNameTree;
new_contents: /*
  PDFNameTree - represents a name tree object
  */
  
  import PDFObject from './object';
  
  class PDFNameTree {
  
    constructor() {
      this._items = {};
    }
  
    add(key, val) {
      return this._items[key] = val;
    }
  
    get(key) {
      return this._items[key];
    }
  
    toString() {
      // Needs to be sorted by key
      const sortedKeys = (Object.keys(this._items)).sort((a, b) => a.localeCompare(b));
  
      const out = ['<<'];
      if (sortedKeys.length > 1) {
        const first = sortedKeys[0], last = sortedKeys[sortedKeys.length - 1];
        out.push(`  /Limits ${PDFObject.convert([new String(first), new String(last)])}`);
      }
      out.push('  /Names [');
      for (let key of sortedKeys) {
        out.push(`    ${PDFObject.convert(new String(key))} ${PDFObject.convert(this._items[key])}`);
      }
      out.push(']');
      out.push('>>');
      return out.join('\n');
    }
  }
  
  export default PDFNameTree;
subject: fix format