types(connection+collection): make BaseCollection and BaseConnection usable as values

types/collection.d.ts

@@ -1,46 +1,49 @@
 declare module 'mongoose' {
   import mongodb = require('mongodb');
 
-  /*
-   * section collection.js
-   */
-  interface CollectionBase<T extends mongodb.Document> extends mongodb.Collection<T> {
-    /*
-     * Abstract methods. Some of these are already defined on the
-     * mongodb.Collection interface so they've been commented out.
+  export class BaseCollection<T extends mongodb.Document> extends mongodb.Collection<T> {
+    /**
+     * Collection constructor
+     * @param name name of the collection
+     * @param conn A MongooseConnection instance
+     * @param opts optional collection options
      */
+    constructor(name: string, conn: Connection, opts?: any);
+
+    /*
+    * Abstract methods. Some of these are already defined on the
+    * mongodb.Collection interface so they've been commented out.
+    */
     ensureIndex(...args: any[]): any;
     findAndModify(...args: any[]): any;
     getIndexes(...args: any[]): any;
 
+    /** Formatter for debug print args */
+    $format(arg: any, color?: boolean, shell?: boolean): string;
+    /** Debug print helper */
+    $print(name: string, i: string | number, args: any[], color?: boolean, shell?: boolean): void;
+
     /** The collection name */
-    collectionName: string;
+    get collectionName(): string;
     /** The Connection instance */
     conn: Connection;
     /** The collection name */
     name: string;
   }
 
-  export type BaseCollection<T extends mongodb.Document> = CollectionBase<T>;
-
   /*
    * section drivers/node-mongodb-native/collection.js
    */
-  interface Collection<T extends mongodb.Document = mongodb.Document> extends CollectionBase<T> {
+  class Collection<T extends mongodb.Document = mongodb.Document> extends BaseCollection<T> {
     /**
      * Collection constructor
      * @param name name of the collection
      * @param conn A MongooseConnection instance
      * @param opts optional collection options
      */
-    // eslint-disable-next-line @typescript-eslint/no-misused-new
-    new(name: string, conn: Connection, opts?: any): Collection<T>;
-    /** Formatter for debug print args */
-    $format(arg: any, color?: boolean, shell?: boolean): string;
-    /** Debug print helper */
-    $print(name: string, i: string | number, args: any[], color?: boolean, shell?: boolean): void;
+    constructor(name: string, conn: Connection, opts?: any);
+
     /** Retrieves information about this collections indexes. */
     getIndexes(): ReturnType<mongodb.Collection<T>['indexInformation']>;
   }
-  let Collection: Collection;
 }

types/connection.d.ts

@@ -71,8 +71,6 @@ declare module 'mongoose' {
       };
   }[keyof SchemaMap];
 
-  export type BaseConnection = Connection;
-
   class Connection extends events.EventEmitter implements SessionStarter {
     /** Runs a [db-level aggregate()](https://www.mongodb.com/docs/manual/reference/method/db.aggregate/) on this connection's underlying `db` */
     aggregate<ResultType = unknown>(pipeline?: PipelineStage[] | null, options?: AggregateOptions): Aggregate<Array<ResultType>>;
@@ -286,4 +284,5 @@ declare module 'mongoose' {
     withSession<T = any>(executor: (session: ClientSession) => Promise<T>): Promise<T>;
   }
 
+  export class BaseConnection extends Connection {}
 }