🩹 Do not set default Producer and Creator

Previously, the "Producer" and "Creator" fields in the PDF Info
dictionary have been set by pdf-lib. They could be overridden in the
document config, but there was no way to remove these fields. Both
fields are optional, so there is no need to set them by default.

This commit removes the default values. Users can set them as needed in
the document definition.

CHANGELOG.md

@@ -7,6 +7,11 @@
 * The attribute `margin` in a document definition now supports a
   function that returns the margin for a given page.
 
+### Fixed
+
+* In the PDF metadata, the fields "Creator" and "Producer" are no longer
+  set to default values.
+
 ## [0.5.0] - 2023-05-18
 
 ### Breaking changes

src/document.ts

@@ -23,7 +23,7 @@ export async function createDocument(def: DocumentDefinition): Promise<Document>
 }
 
 export async function renderDocument(def: DocumentDefinition, doc: Document): Promise<PDFDocument> {
-  const pdfDoc = await PDFDocument.create();
+  const pdfDoc = await PDFDocument.create({ updateMetadata: false });
   pdfDoc.registerFontkit(fontkit);
   await embedFonts(doc.fonts ?? [], pdfDoc);
   await embedImages(doc.images ?? [], pdfDoc);
@@ -51,6 +51,9 @@ export async function finishDocument(def: DocumentDefinition, pdfDoc: PDFDocumen
 }
 
 function setMetadata(doc: PDFDocument, info?: Metadata) {
+  const now = new Date();
+  doc.setModificationDate(now);
+  doc.setCreationDate(now);
   if (info?.title) {
     doc.setTitle(info.title);
   }