Update document.d.ts

/**
 * Alias for `set()`, used internally to avoid conflicts
 *
 * @param {String|Object} path path or object of key/vals to set
 * @param {Any} val the value to set
 * @param {Schema|String|Number|Buffer|*} [type] optionally specify a type for "on-the-fly" attributes
 * @param {Object} [options] optionally specify options that modify the behavior of the set
 * @param {Boolean} [options.merge=false] if true, setting a [nested path](/docs/subdocs.html#subdocuments-versus-nested-paths) will merge existing values rather than overwrite the whole object. So `doc.set('nested', { a: 1, b: 2 })` becomes `doc.set('nested.a', 1); doc.set('nested.b', 2);`
 * @return {Document} this
 * @method $set
 * @memberof Document
 * @instance
 * @api public
 */

Author: jeffersonlipsky

types/document.d.ts

@@ -90,9 +90,9 @@ declare module 'mongoose' {
     $session(session?: ClientSession | null): ClientSession | null;
 
     /** Alias for `set()`, used internally to avoid conflicts */
-    $set(path: string, val: any, type: any, options?: DocumentSetOptions): this;
-    $set(path: string, val: any, options?: DocumentSetOptions): this;
-    $set(value: any): this;
+    $set(path: string | Record<string, any>, val: any, type: any, options?: DocumentSetOptions): this;
+    $set(path: string | Record<string, any>, val: any, options?: DocumentSetOptions): this;
+    $set(value: string | Record<string, any>): this;
 
     /** Set this property to add additional query filters when Mongoose saves this document and `isNew` is false. */
     $where: Record<string, unknown>;
@@ -216,9 +216,9 @@ declare module 'mongoose' {
     schema: Schema;
 
     /** Sets the value of a path, or many paths. */
-    set(path: string, val: any, type: any, options?: any): this;
-    set(path: string, val: any, options?: any): this;
-    set(value: any): this;
+    set(path: string | Record<string, any>, val: any, type: any, options?: DocumentSetOptions): this;
+    set(path: string | Record<string, any>, val: any, options?: DocumentSetOptions): this;
+    set(value: string | Record<string, any>): this;
 
     /** The return value of this method is used in calls to JSON.stringify(doc). */
     toJSON<T = Require_id<DocType>>(options?: ToObjectOptions & { flattenMaps?: true }): FlattenMaps<T>;