From 487a7ddc7d6d5a69b48ebf92c27c894dcad53651 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Tue, 30 Nov 2021 13:11:50 +0100
Subject: [PATCH] Update (primarily) the Node.js examples to release page
 resources

Given that Node.js doesn't support Workers, general PDF.js performance will be worse when compared to browsers. In an attempt to improve at least memory usage a little bit, update the Node.js examples to release page resources once parsing is done for that page.
---
 examples/node/getinfo.js         | 2 ++
 examples/node/pdf2png/pdf2png.js | 2 ++
 examples/node/pdf2svg.js         | 2 ++
 examples/text-only/pdf2svg.js    | 2 ++
 4 files changed, 8 insertions(+)

diff --git a/examples/node/getinfo.js b/examples/node/getinfo.js
index 944f9e930..1cd59bcfc 100644
--- a/examples/node/getinfo.js
+++ b/examples/node/getinfo.js
@@ -53,6 +53,8 @@ loadingTask.promise
             });
             console.log("## Text Content");
             console.log(strings.join(" "));
+            // Release page resources.
+            page.cleanup();
           })
           .then(function () {
             console.log();
diff --git a/examples/node/pdf2png/pdf2png.js b/examples/node/pdf2png/pdf2png.js
index 85e5a66ec..cc66cfcf1 100644
--- a/examples/node/pdf2png/pdf2png.js
+++ b/examples/node/pdf2png/pdf2png.js
@@ -103,6 +103,8 @@ const loadingTask = pdfjsLib.getDocument({
         );
       }
     });
+    // Release page resources.
+    page.cleanup();
   } catch (reason) {
     console.log(reason);
   }
diff --git a/examples/node/pdf2svg.js b/examples/node/pdf2svg.js
index 11d4d1101..0fa1cb41c 100644
--- a/examples/node/pdf2svg.js
+++ b/examples/node/pdf2svg.js
@@ -118,6 +118,8 @@ const loadingTask = pdfjsLib.getDocument({
       svgGfx.embedFonts = true;
       const svg = await svgGfx.getSVG(opList, viewport);
       await writeSvgToFile(svg, getFilePathForPage(pageNum));
+      // Release page resources.
+      page.cleanup();
     } catch (err) {
       console.log(`Error: ${err}`);
     }
diff --git a/examples/text-only/pdf2svg.js b/examples/text-only/pdf2svg.js
index 201460324..df9652ede 100644
--- a/examples/text-only/pdf2svg.js
+++ b/examples/text-only/pdf2svg.js
@@ -58,6 +58,8 @@ async function pageLoaded() {
   // building SVG and adding that to the DOM
   const svg = buildSVG(viewport, textContent);
   document.getElementById("pageContainer").appendChild(svg);
+  // Release page resources.
+  page.cleanup();
 }
 
 document.addEventListener("DOMContentLoaded", function () {