Merge pull request #26057 from ethanresnick/mongoose-connection-patch

feat(mongoose): Document Connection.then/catch

types/mongoose/index.d.ts

@@ -433,7 +433,7 @@ declare module "mongoose" {
     $format(arg: any): string;
     /** Debug print helper */
     $print(name: any, i: any, args: any[]): void;
-    /** Retreives information about this collections indexes. */
+    /** Retrieves information about this collections indexes. */
     getIndexes(): any;
   }
 
@@ -451,6 +451,9 @@ declare module "mongoose" {
 
     /** Expose the possible connection states. */
     static STATES: any;
+
+    then: Promise<Connection>["then"];
+    catch: Promise<Connection>["catch"];
   }
 
   /*

types/mongoose/mongoose-tests.ts

@@ -37,6 +37,11 @@ const connection3: null = mongoose.connect(connectUri, function (error) {
 var mongooseConnection: mongoose.Connection = mongoose.createConnection();
 mongooseConnection.dropDatabase().then(()=>{});
 mongooseConnection.dropCollection('foo').then(()=>{});
+mongoose.createConnection(connectUri).then((conn)=> {
+  return conn.collections;
+}, () => {
+
+});
 mongoose.createConnection(connectUri).open('');
 mongoose.createConnection(connectUri, {
   db: {