Method getOrCreateViewerPreferences

src/api/pdf.ts:1521–1534

* Get or create the ViewerPreferences dictionary.

()

   * Get or create the ViewerPreferences dictionary.
   */
  private getOrCreateViewerPreferences(): PdfDict {
    const catalog = this.ctx.catalog.getDict();
    const existing = catalog.getDict("ViewerPreferences", this.ctx.resolve.bind(this.ctx));

    if (existing) {
      return existing;
    }

    // Create new ViewerPreferences
    const prefs = new PdfDict();
    catalog.set("ViewerPreferences", prefs);

    return prefs;
  }

  // ─────────────────────────────────────────────────────────────────────────────
  // Object access