some progress

node_modules/bson/src/max_key.ts

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+import { BSONValue } from './bson_value';
+
+/** @public */
+export interface MaxKeyExtended {
+  $maxKey: 1;
+}
+
+/**
+ * A class representation of the BSON MaxKey type.
+ * @public
+ * @category BSONType
+ */
+export class MaxKey extends BSONValue {
+  get _bsontype(): 'MaxKey' {
+    return 'MaxKey';
+  }
+
+  /** @internal */
+  toExtendedJSON(): MaxKeyExtended {
+    return { $maxKey: 1 };
+  }
+
+  /** @internal */
+  static fromExtendedJSON(): MaxKey {
+    return new MaxKey();
+  }
+
+  /** @internal */
+  [Symbol.for('nodejs.util.inspect.custom')](): string {
+    return this.inspect();
+  }
+
+  inspect(): string {
+    return 'new MaxKey()';
+  }
+}