Print more warnings about potential problems in Node.js environments

- Warn if the "regular" PDF.js build is used in Node.js environments, since that won't load any of the relevant polyfills.

 - Warn if the `require` function cannot be accessed, since currently we're just "swallowing" any errors.

src/display/node_utils.js

@@ -26,11 +26,10 @@ if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
   );
 }
 
-if (
+if (isNodeJS) {
-  typeof PDFJSDev !== "undefined" &&
+  if (typeof PDFJSDev === "undefined" || PDFJSDev.test("SKIP_BABEL")) {
-  !PDFJSDev.test("SKIP_BABEL") &&
+    warn("Please use the `legacy` build in Node.js environments.");
-  isNodeJS
+  } else {
-) {
     let canvas;
     try {
       const require = process
@@ -42,7 +41,9 @@ if (
       } catch (ex) {
         warn(`Cannot load "@napi-rs/canvas" package: "${ex}".`);
       }
-  } catch {}
+    } catch (ex) {
+      warn(`Cannot access the \`require\` function: "${ex}".`);
+    }
 
     if (!globalThis.DOMMatrix) {
       if (canvas?.DOMMatrix) {
@@ -66,6 +67,7 @@ if (
       }
     }
   }
+}
 
 async function fetchData(url) {
   const fs = process.getBuiltinModule("fs");