Covert the ObjectLoader to a "normal" class

src/core/object_loader.js

@@ -17,28 +17,16 @@ import { Dict, isStream, Ref, RefSet } from "./primitives.js";
 import { MissingDataException } from "./core_utils.js";
 import { warn } from "../shared/util.js";
 
-/**
+function mayHaveChildren(value) {
- * A helper for loading missing data in `Dict` graphs. It traverses the graph
- * depth first and queues up any objects that have missing data. Once it has
- * has traversed as many objects that are available it attempts to bundle the
- * missing data requests and then resume from the nodes that weren't ready.
- *
- * NOTE: It provides protection from circular references by keeping track of
- * loaded references. However, you must be careful not to load any graphs
- * that have references to the catalog or other pages since that will cause the
- * entire PDF document object graph to be traversed.
- */
-const ObjectLoader = (function () {
-  function mayHaveChildren(value) {
   return (
     value instanceof Ref ||
     value instanceof Dict ||
     Array.isArray(value) ||
     isStream(value)
   );
-  }
+}
 
-  function addChildren(node, nodesToVisit) {
+function addChildren(node, nodesToVisit) {
   if (node instanceof Dict) {
     node = node.getRawValues();
   } else if (isStream(node)) {
@@ -51,17 +39,27 @@ const ObjectLoader = (function () {
       nodesToVisit.push(rawValue);
     }
   }
-  }
+}
 
-  // eslint-disable-next-line no-shadow
+/**
-  function ObjectLoader(dict, keys, xref) {
+ * A helper for loading missing data in `Dict` graphs. It traverses the graph
+ * depth first and queues up any objects that have missing data. Once it has
+ * has traversed as many objects that are available it attempts to bundle the
+ * missing data requests and then resume from the nodes that weren't ready.
+ *
+ * NOTE: It provides protection from circular references by keeping track of
+ * loaded references. However, you must be careful not to load any graphs
+ * that have references to the catalog or other pages since that will cause the
+ * entire PDF document object graph to be traversed.
+ */
+class ObjectLoader {
+  constructor(dict, keys, xref) {
     this.dict = dict;
     this.keys = keys;
     this.xref = xref;
     this.refSet = null;
   }
 
-  ObjectLoader.prototype = {
   async load() {
     // Don't walk the graph if all the data is already loaded; note that only
     // `ChunkedStream` instances have a `allChunksLoaded` method.
@@ -84,7 +82,7 @@ const ObjectLoader = (function () {
       }
     }
     return this._walk(nodesToVisit);
-    },
+  }
 
   async _walk(nodesToVisit) {
     const nodesToRevisit = [];
@@ -148,10 +146,7 @@ const ObjectLoader = (function () {
     // Everything is loaded.
     this.refSet = null;
     return undefined;
-    },
+  }
-  };
+}
-
-  return ObjectLoader;
-})();
 
 export { ObjectLoader };