diff --git a/src/swiper-effect-utils.d.ts b/src/swiper-effect-utils.d.ts
index 97f31c2ed..aaee39d97 100644
--- a/src/swiper-effect-utils.d.ts
+++ b/src/swiper-effect-utils.d.ts
@@ -5,13 +5,13 @@ declare const createShadow: (suffix?: string, slideEl: HTMLElement, side?: strin
 declare const effectInit: (params: {
   effect: string;
   swiper: Swiper;
-  on?: () => void;
-  setTranslate?: () => void;
-  setTransition?: () => void;
+  on: () => void;
+  setTranslate: () => void;
+  setTransition: (duration: number) => void;
   overwriteParams?: () => SwiperOptions;
-  perspective?: boolean;
+  perspective?: () => boolean;
   recreateShadows?: () => void;
-  getEffectParams?: () => any;
+  getEffectParams?: () => { slideShadows?: boolean };
 }) => void;
 
 declare const effectTarget: (effectParams: any, slideEl: HTMLElement) => void;
diff --git a/src/types/shared.d.ts b/src/types/shared.d.ts
index 4c28f9654..821f71349 100644
--- a/src/types/shared.d.ts
+++ b/src/types/shared.d.ts
@@ -1,5 +1,13 @@
+import { Swiper } from './index.d.ts';
+
 export interface CSSSelector extends String {}
 
-export interface SwiperModule {
-  name: string;
-}
+export type SwiperModule = (options: {
+  params: Swiper['params'];
+  swiper: Swiper;
+  extendParams: (obj: { [name: string]: any }) => void;
+  on: Swiper['on'];
+  once: Swiper['once'];
+  off: Swiper['off'];
+  emit: Swiper['emit'];
+}) => void;
diff --git a/src/types/swiper-class.d.ts b/src/types/swiper-class.d.ts
index 11e521834..213916dc6 100644
--- a/src/types/swiper-class.d.ts
+++ b/src/types/swiper-class.d.ts
@@ -215,7 +215,7 @@ interface Swiper extends SwiperClass<SwiperEvents> {
    * @param runCallbacks Set it to false (by default it is true) and transition will
    *  not produce transition events.
    */
-  slideNext(speed?: number, runCallbacks?: boolean): void;
+  slideNext(speed?: number, runCallbacks?: boolean): boolean;
 
   /**
    * Run transition to previous slide.
@@ -224,7 +224,7 @@ interface Swiper extends SwiperClass<SwiperEvents> {
    * @param runCallbacks Set it to false (by default it is true) and transition will
    *  not produce transition events.
    */
-  slidePrev(speed?: number, runCallbacks?: boolean): void;
+  slidePrev(speed?: number, runCallbacks?: boolean): boolean;
 
   /**
    * Run transition to the slide with index number equal to 'index' parameter for the
@@ -235,7 +235,7 @@ interface Swiper extends SwiperClass<SwiperEvents> {
    * @param runCallbacks Set it to false (by default it is true) and transition will
    *  not produce transition events.
    */
-  slideTo(index: number, speed?: number, runCallbacks?: boolean): void;
+  slideTo(index: number, speed?: number, runCallbacks?: boolean): boolean;
 
   /**
    * Does the same as .slideTo but for the case when used with enabled loop. So this
@@ -246,7 +246,7 @@ interface Swiper extends SwiperClass<SwiperEvents> {
    * @param runCallbacks Set it to false (by default it is true) and transition will
    *  not produce transition events.
    */
-  slideToLoop(index: number, speed?: number, runCallbacks?: boolean): void;
+  slideToLoop(index: number, speed?: number, runCallbacks?: boolean): Swiper;
 
   /**
    * Reset swiper position to currently active slide for the duration equal to 'speed'
@@ -256,7 +256,7 @@ interface Swiper extends SwiperClass<SwiperEvents> {
    * @param runCallbacks Set it to false (by default it is true) and transition will
    *  not produce transition events.
    */
-  slideReset(speed?: number, runCallbacks?: boolean): void;
+  slideReset(speed?: number, runCallbacks?: boolean): boolean;
 
   /**
    * Reset swiper position to closest slide/snap point for the duration equal to 'speed' parameter.
@@ -265,7 +265,7 @@ interface Swiper extends SwiperClass<SwiperEvents> {
    * @param runCallbacks Set it to false (by default it is true) and transition will
    *  not produce transition events.
    */
-  slideToClosest(speed?: number, runCallbacks?: boolean): void;
+  slideToClosest(speed?: number, runCallbacks?: boolean): boolean;
 
   /**
    * Get dynamically calculated amount of slides per view, useful only when slidesPerView set to `auto`