ignore jupyter widget related js files

this is caused by the js widgets implementation probing locally before loading the required js from a remote CDN - so no need to display the error.

Author: dragonstyle

src/core/http.ts

@@ -88,12 +88,18 @@ export function httpFileRequestHandler(
         : { print: true, response: { body: encoder.encode("Not Found") } };
 
       // Ignore 404s from specific files
-      const ignoreFileNames = ["favicon.ico", "listings.json"];
+      const ignoreFileNames = [
+        "favicon.ico",
+        "listings.json",
+        /jupyter-.*.js/,
+      ];
 
       handle404.print = handle404.print &&
         !!options.printUrls &&
         (!fsPath || (
-          !ignoreFileNames.includes(basename(fsPath)) &&
+          !ignoreFileNames.find((name) => {
+            return basename(fsPath).match(name);
+          }) &&
           extname(fsPath) !== ".map"
         ));
       if (handle404.print) {

src/core/jupyter/jupyter-embed.ts

@@ -185,6 +185,8 @@ async function notebookMarkdown(
     options,
   );
 
+  // Wrap any injected cells with a div that includes a back link to
+  // the notebook that originated the cells
   const notebookMarkdown = (cells: JupyterCellOutput[]) => {
     const markdown = ["", `:::{notebook="${nbAddress.path}"}`];
     markdown.push("");