diff --git a/test/types/schema.test.ts b/test/types/schema.test.ts
index 04828bc4f1..5a399a0c7d 100644
--- a/test/types/schema.test.ts
+++ b/test/types/schema.test.ts
@@ -1634,3 +1634,7 @@ function gh14825() {
   type SchemaType = InferSchemaType<typeof schema>;
   expectAssignable<User>({} as SchemaType);
 }
+
+function gh14879() {
+  Schema.Types.String.setters.push((val?: unknown) => typeof val === 'string' ? val.trim() : val);
+}
diff --git a/types/schematypes.d.ts b/types/schematypes.d.ts
index e8a0ecffdf..f5ca8ec0da 100644
--- a/types/schematypes.d.ts
+++ b/types/schematypes.d.ts
@@ -216,6 +216,9 @@ declare module 'mongoose' {
     /** Attaches a getter for all instances of this schema type. */
     static get(getter: (value: any) => any): void;
 
+    /** Array containing default setters for all instances of this SchemaType */
+    static setters: ((val?: unknown, priorVal?: unknown, doc?: Document<unknown>, options?: Record<string, any> | null) => unknown)[];
+
     /** The class that Mongoose uses internally to instantiate this SchemaType's `options` property. */
     OptionsConstructor: SchemaTypeOptions<T>;