Added pre and post function types on Query class

Author: IICarst

types/query.d.ts

@@ -627,6 +627,12 @@ declare module 'mongoose' {
  QueryOp
  >;
 
+ /** Add pre middleware to this query instance. Doesn't affect other queries. */
+ pre(fn: Function): this;
+
+ /** Add post middleware to this query instance. Doesn't affect other queries. */
+ post(fn: Function): this;
+
  /** Get/set the current projection (AKA fields). Pass `null` to remove the current projection. */
  projection(fields?: ProjectionFields<DocType> | string): ProjectionFields<DocType>;
  projection(fields: null): null;