diff --git a/src/core/EventBus.ts b/src/core/EventBus.ts
index 444b7cc..41b49a0 100644
--- a/src/core/EventBus.ts
+++ b/src/core/EventBus.ts
@@ -59,14 +59,14 @@ export class EventBus implements IEventBus {
   /**
    * Emit an event via DOM CustomEvent
    */
-  emit(eventType: string, detail: any = {}): boolean {
+  emit(eventType: string, detail: unknown = {}): boolean {
     // Validate eventType
-    if (!eventType || typeof eventType !== 'string') {
+    if (!eventType) {
       return false;
     }
 
     const event = new CustomEvent(eventType, {
-      detail,
+      detail: detail ?? {},
       bubbles: true,
       cancelable: true
     });
@@ -78,7 +78,7 @@ export class EventBus implements IEventBus {
 
     this.eventLog.push({
       type: eventType,
-      detail,
+      detail: detail ?? {},
       timestamp: Date.now()
     });
 
@@ -89,7 +89,7 @@ export class EventBus implements IEventBus {
   /**
    * Log event with console grouping
    */
-  private logEventWithGrouping(eventType: string, detail: any): void {
+  private logEventWithGrouping(eventType: string, detail: unknown): void {
     // Extract category from event type (e.g., 'calendar:datechanged' → 'calendar')
     const category = this.extractCategory(eventType);
     
@@ -108,7 +108,7 @@ export class EventBus implements IEventBus {
    * Extract category from event type
    */
   private extractCategory(eventType: string): string {
-    if (!eventType || typeof eventType !== 'string') {
+    if (!eventType) {
       return 'unknown';
     }
     
diff --git a/src/factories/ManagerFactory.ts b/src/factories/ManagerFactory.ts
index acdf6b1..d35d38c 100644
--- a/src/factories/ManagerFactory.ts
+++ b/src/factories/ManagerFactory.ts
@@ -8,6 +8,7 @@ import { ViewManager } from '../managers/ViewManager';
 import { CalendarManager } from '../managers/CalendarManager';
 import { DragDropManager } from '../managers/DragDropManager';
 import { AllDayManager } from '../managers/AllDayManager';
+import { CalendarManagers } from '../types/ManagerTypes';
 
 /**
  * Factory for creating and managing calendar managers with proper dependency injection
@@ -27,17 +28,7 @@ export class ManagerFactory {
   /**
    * Create all managers with proper dependency injection
    */
-  public createManagers(eventBus: IEventBus): {
-    eventManager: EventManager;
-    eventRenderer: EventRenderingService;
-    gridManager: GridManager;
-    scrollManager: ScrollManager;
-    navigationManager: NavigationManager;
-    viewManager: ViewManager;
-    calendarManager: CalendarManager;
-    dragDropManager: DragDropManager;
-    allDayManager: AllDayManager;
-  } {
+  public createManagers(eventBus: IEventBus): CalendarManagers {
     
     // Create managers in dependency order
     const eventManager = new EventManager(eventBus);
@@ -75,13 +66,10 @@ export class ManagerFactory {
   /**
    * Initialize all managers in the correct order
    */
-  public async initializeManagers(managers: {
-    calendarManager: CalendarManager;
-    [key: string]: any;
-  }): Promise<void> {
+  public async initializeManagers(managers: CalendarManagers): Promise<void> {
     
     try {
-      await managers.calendarManager.initialize();
+      await managers.calendarManager.initialize?.();
     } catch (error) {
       throw error;
     }
diff --git a/src/index.ts b/src/index.ts
index a412dd0..f9c0049 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,15 +1,16 @@
 // Main entry point for Calendar Plantempus
-import { eventBus } from './core/EventBus.js';
-import { calendarConfig } from './core/CalendarConfig.js';
-import { CalendarTypeFactory } from './factories/CalendarTypeFactory.js';
-import { ManagerFactory } from './factories/ManagerFactory.js';
-import { DateCalculator } from './utils/DateCalculator.js';
-import { URLManager } from './utils/URLManager.js';
+import { eventBus } from './core/EventBus';
+import { calendarConfig } from './core/CalendarConfig';
+import { CalendarTypeFactory } from './factories/CalendarTypeFactory';
+import { ManagerFactory } from './factories/ManagerFactory';
+import { DateCalculator } from './utils/DateCalculator';
+import { URLManager } from './utils/URLManager';
+import { CalendarManagers } from './types/ManagerTypes';
 
 /**
  * Handle deep linking functionality after managers are initialized
  */
-async function handleDeepLinking(managers: any): Promise<void> {
+async function handleDeepLinking(managers: CalendarManagers): Promise<void> {
   try {
     const urlManager = new URLManager(eventBus);
     const eventId = urlManager.parseEventIdFromURL();
@@ -58,8 +59,12 @@ async function initializeCalendar(): Promise<void> {
     // Handle deep linking after managers are initialized
     await handleDeepLinking(managers);
     
-    // Expose to window for debugging
-    (window as any).calendarDebug = {
+    // Expose to window for debugging (with proper typing)
+    (window as Window & { 
+      calendarDebug?: {
+        eventBus: typeof eventBus;
+      } & CalendarManagers;
+    }).calendarDebug = {
       eventBus,
       ...managers
     };
diff --git a/src/interfaces/IManager.ts b/src/interfaces/IManager.ts
index e8ee254..37dd4f0 100644
--- a/src/interfaces/IManager.ts
+++ b/src/interfaces/IManager.ts
@@ -1,3 +1,5 @@
+import { CalendarEvent } from '../types/CalendarTypes';
+
 /**
  * Base interface for all managers
  */
@@ -23,8 +25,8 @@ export interface IManager {
  */
 export interface IEventManager extends IManager {
   loadData(): Promise<void>;
-  getEvents(): any[];
-  getEventsForPeriod(startDate: Date, endDate: Date): any[];
+  getEvents(): CalendarEvent[];
+  getEventsForPeriod(startDate: Date, endDate: Date): CalendarEvent[];
 }
 
 /**
diff --git a/src/managers/AllDayManager.ts b/src/managers/AllDayManager.ts
index bb61afe..0d5d533 100644
--- a/src/managers/AllDayManager.ts
+++ b/src/managers/AllDayManager.ts
@@ -10,6 +10,7 @@ import {
   DragMoveEventPayload,
   DragEndEventPayload
 } from '../types/EventTypes';
+import { DragOffset, MousePosition } from '../types/DragDropTypes';
 
 /**
  * AllDayManager - Handles all-day row height animations and management
@@ -102,7 +103,7 @@ export class AllDayManager {
 
 
       console.log('🎯 AllDayManager: Ending drag for all-day event', { eventId });
-      this.handleDragEnd(draggedElement, dragClone as HTMLElement, finalPosition.column);
+      this.handleDragEnd(draggedElement, dragClone as HTMLElement, { column: finalPosition.column || '', y: 0 });
     });
 
     // Listen for drag cancellation to recalculate height
@@ -374,7 +375,7 @@ export class AllDayManager {
   /**
    * Handle drag start for all-day events
    */
-  private handleDragStart(originalElement: HTMLElement, eventId: string, mouseOffset: any): void {
+  private handleDragStart(originalElement: HTMLElement, eventId: string, mouseOffset: DragOffset): void {
     // Create clone
     const clone = originalElement.cloneNode(true) as HTMLElement;
     clone.dataset.eventId = `clone-${eventId}`;
@@ -409,7 +410,7 @@ export class AllDayManager {
   /**
    * Handle drag move for all-day events
    */
-  private handleDragMove(dragClone: HTMLElement, mousePosition: any): void {
+  private handleDragMove(dragClone: HTMLElement, mousePosition: MousePosition): void {
     // Calculate grid column based on mouse position
     const dayHeaders = document.querySelectorAll('swp-day-header');
     let targetColumn = 1;
@@ -434,7 +435,7 @@ export class AllDayManager {
   /**
    * Handle drag end for all-day events
    */
-  private handleDragEnd(originalElement: HTMLElement, dragClone: HTMLElement, finalPosition: any): void {
+  private handleDragEnd(originalElement: HTMLElement, dragClone: HTMLElement, finalPosition: { column: string; y: number }): void {
 
     // Normalize clone
     const cloneId = dragClone.dataset.eventId;
diff --git a/src/managers/CalendarManager.ts b/src/managers/CalendarManager.ts
index 1cae7ed..e09b0df 100644
--- a/src/managers/CalendarManager.ts
+++ b/src/managers/CalendarManager.ts
@@ -1,14 +1,15 @@
-import { EventBus } from '../core/EventBus.js';
-import { CoreEvents } from '../constants/CoreEvents.js';
-import { calendarConfig } from '../core/CalendarConfig.js';
-import { CalendarEvent, CalendarView, IEventBus } from '../types/CalendarTypes.js';
-import { EventManager } from './EventManager.js';
-import { GridManager } from './GridManager.js';
-import { HeaderManager } from './HeaderManager.js';
-import { EventRenderingService } from '../renderers/EventRendererManager.js';
-import { ScrollManager } from './ScrollManager.js';
-import { DateCalculator } from '../utils/DateCalculator.js';
-import { EventFilterManager } from './EventFilterManager.js';
+import { EventBus } from '../core/EventBus';
+import { CoreEvents } from '../constants/CoreEvents';
+import { calendarConfig } from '../core/CalendarConfig';
+import { CalendarEvent, CalendarView, IEventBus } from '../types/CalendarTypes';
+import { EventManager } from './EventManager';
+import { GridManager } from './GridManager';
+import { HeaderManager } from './HeaderManager';
+import { EventRenderingService } from '../renderers/EventRendererManager';
+import { ScrollManager } from './ScrollManager';
+import { DateCalculator } from '../utils/DateCalculator';
+import { EventFilterManager } from './EventFilterManager';
+import { InitializationReport } from '../types/ManagerTypes';
 
 /**
  * CalendarManager - Main coordinator for all calendar managers
@@ -65,7 +66,7 @@ export class CalendarManager {
             // Step 2: Pass data to GridManager and render grid structure  
             if (calendarType === 'resource') {
                 const resourceData = this.eventManager.getResourceData();
-                this.gridManager.setResourceData(resourceData);
+                this.gridManager.setResourceData(this.eventManager.getRawData() as import('../types/CalendarTypes').ResourceCalendarData);
             }
             await this.gridManager.render();
             
@@ -211,12 +212,17 @@ export class CalendarManager {
     /**
      * Get initialization report for debugging
      */
-    public getInitializationReport(): any {
+    public getInitializationReport(): InitializationReport {
         return {
-            isInitialized: this.isInitialized,
-            currentView: this.currentView,
-            currentDate: this.currentDate,
-            initializationTime: 'N/A - simple initialization'
+            initialized: this.isInitialized,
+            timestamp: Date.now(),
+            managers: {
+                calendar: { initialized: this.isInitialized },
+                event: { initialized: true },
+                grid: { initialized: true },
+                header: { initialized: true },
+                scroll: { initialized: true }
+            }
         };
     }
 
diff --git a/src/managers/EventFilterManager.ts b/src/managers/EventFilterManager.ts
index e4c306d..5845186 100644
--- a/src/managers/EventFilterManager.ts
+++ b/src/managers/EventFilterManager.ts
@@ -10,13 +10,19 @@ import { CalendarEvent } from '../types/CalendarTypes';
 // Import Fuse.js from npm
 import Fuse from 'fuse.js';
 
+interface FuseResult {
+  item: CalendarEvent;
+  refIndex: number;
+  score?: number;
+}
+
 export class EventFilterManager {
   private searchInput: HTMLInputElement | null = null;
   private allEvents: CalendarEvent[] = [];
   private matchingEventIds: Set<string> = new Set();
   private isFilterActive: boolean = false;
   private frameRequest: number | null = null;
-  private fuse: any = null;
+  private fuse: Fuse<CalendarEvent> | null = null;
   
   constructor() {
     // Wait for DOM to be ready before initializing
@@ -119,7 +125,7 @@ export class EventFilterManager {
     
     // Extract matching event IDs
     this.matchingEventIds.clear();
-    results.forEach((result: any) => {
+    results.forEach((result: FuseResult) => {
       if (result.item && result.item.id) {
         this.matchingEventIds.add(result.item.id);
       }
diff --git a/src/managers/EventManager.ts b/src/managers/EventManager.ts
index 8a7925a..4a9252c 100644
--- a/src/managers/EventManager.ts
+++ b/src/managers/EventManager.ts
@@ -3,6 +3,17 @@ import { IEventBus, CalendarEvent, ResourceCalendarData } from '../types/Calenda
 import { CoreEvents } from '../constants/CoreEvents';
 import { calendarConfig } from '../core/CalendarConfig';
 import { DateCalculator } from '../utils/DateCalculator';
+import { ResourceData } from '../types/ManagerTypes';
+
+interface RawEventData {
+  id: string;
+  title: string;
+  start: string | Date;
+  end: string | Date;
+  color?: string;
+  allDay?: boolean;
+  [key: string]: unknown;
+}
 
 /**
  * EventManager - Optimized event lifecycle and CRUD operations
@@ -11,7 +22,7 @@ import { DateCalculator } from '../utils/DateCalculator';
 export class EventManager {
     private eventBus: IEventBus;
     private events: CalendarEvent[] = [];
-    private rawData: any = null;
+    private rawData: ResourceCalendarData | RawEventData[] | null = null;
     private eventCache = new Map<string, CalendarEvent[]>(); // Cache for period queries
     private lastCacheKey: string = '';
 
@@ -57,7 +68,7 @@ export class EventManager {
     /**
      * Optimized data processing with better type safety
      */
-    private processCalendarData(calendarType: string, data: any): CalendarEvent[] {
+    private processCalendarData(calendarType: string, data: ResourceCalendarData | RawEventData[]): CalendarEvent[] {
         if (calendarType === 'resource') {
             const resourceData = data as ResourceCalendarData;
             return resourceData.resources.flatMap(resource =>
@@ -72,10 +83,14 @@ export class EventManager {
             );
         }
         
-        return data.map((event: any) => ({
+        const eventData = data as RawEventData[];
+        return eventData.map((event): CalendarEvent => ({
             ...event,
             start: new Date(event.start),
-            end: new Date(event.end)
+            end: new Date(event.end),
+            type: 'event',
+            allDay: event.allDay || false,
+            syncStatus: 'synced' as const
         }));
     }
 
@@ -97,7 +112,24 @@ export class EventManager {
     /**
      * Get raw resource data for resource calendar mode
      */
-    public getResourceData(): any {
+    public getResourceData(): ResourceData | null {
+        if (!this.rawData || !('resources' in this.rawData)) {
+            return null;
+        }
+        return {
+            resources: this.rawData.resources.map(r => ({
+                id: r.employeeId || r.name, // Use employeeId as id, fallback to name
+                name: r.name,
+                type: r.employeeId ? 'employee' : 'resource',
+                color: 'blue' // Default color since Resource interface doesn't have color
+            }))
+        };
+    }
+
+    /**
+     * Get raw data for compatibility
+     */
+    public getRawData(): ResourceCalendarData | RawEventData[] | null {
         return this.rawData;
     }
 
diff --git a/src/managers/GridManager.ts b/src/managers/GridManager.ts
index f75bf75..c0bac0b 100644
--- a/src/managers/GridManager.ts
+++ b/src/managers/GridManager.ts
@@ -264,7 +264,7 @@ export class GridManager {
   /**
    * Get layout config for current view
    */
-  private getLayoutConfig(): any {
+  private getLayoutConfig(): { columnCount: number; type: string } {
     switch (this.currentView) {
       case 'week':
         return {
diff --git a/src/managers/NavigationManager.ts b/src/managers/NavigationManager.ts
index f03c9b4..892afb9 100644
--- a/src/managers/NavigationManager.ts
+++ b/src/managers/NavigationManager.ts
@@ -1,9 +1,9 @@
-import { IEventBus } from '../types/CalendarTypes.js';
-import { EventRenderingService } from '../renderers/EventRendererManager.js';
-import { DateCalculator } from '../utils/DateCalculator.js';
-import { CoreEvents } from '../constants/CoreEvents.js';
-import { NavigationRenderer } from '../renderers/NavigationRenderer.js';
-import { calendarConfig } from '../core/CalendarConfig.js';
+import { IEventBus } from '../types/CalendarTypes';
+import { EventRenderingService } from '../renderers/EventRendererManager';
+import { DateCalculator } from '../utils/DateCalculator';
+import { CoreEvents } from '../constants/CoreEvents';
+import { NavigationRenderer } from '../renderers/NavigationRenderer';
+import { calendarConfig } from '../core/CalendarConfig';
 
 /**
  * NavigationManager handles calendar navigation (prev/next/today buttons)
diff --git a/src/renderers/EventRenderer.ts b/src/renderers/EventRenderer.ts
index 2f56bc0..5d69d94 100644
--- a/src/renderers/EventRenderer.ts
+++ b/src/renderers/EventRenderer.ts
@@ -8,6 +8,7 @@ import { OverlapDetector, OverlapResult } from '../utils/OverlapDetector';
 import { SwpEventElement } from '../elements/SwpEventElement';
 import { TimeFormatter } from '../utils/TimeFormatter';
 import { PositionUtils } from '../utils/PositionUtils';
+import { DragOffset, StackLinkData } from '../types/DragDropTypes';
 
 /**
  * Interface for event rendering strategies
@@ -15,8 +16,8 @@ import { PositionUtils } from '../utils/PositionUtils';
 export interface EventRendererStrategy {
   renderEvents(events: CalendarEvent[], container: HTMLElement): void;
   clearEvents(container?: HTMLElement): void;
-  handleDragStart?(originalElement: HTMLElement, eventId: string, mouseOffset: any, column: string): void;
-  handleDragMove?(eventId: string, snappedY: number, column: string, mouseOffset: any): void;
+  handleDragStart?(originalElement: HTMLElement, eventId: string, mouseOffset: DragOffset, column: string): void;
+  handleDragMove?(eventId: string, snappedY: number, column: string, mouseOffset: DragOffset): void;
   handleDragAutoScroll?(eventId: string, snappedY: number): void;
   handleDragEnd?(eventId: string, originalElement: HTMLElement, draggedClone: HTMLElement, finalColumn: string, finalY: number): void;
   handleEventClick?(eventId: string, originalElement: HTMLElement): void;
@@ -159,7 +160,7 @@ export abstract class BaseEventRenderer implements EventRendererStrategy {
   /**
    * Handle drag start event
    */
-  public handleDragStart(originalElement: HTMLElement, eventId: string, mouseOffset: any, column: string): void {
+  public handleDragStart(originalElement: HTMLElement, eventId: string, mouseOffset: DragOffset, column: string): void {
     this.originalEvent = originalElement;
 
     // Remove stacking styling during drag will be handled by new system
@@ -195,7 +196,7 @@ export abstract class BaseEventRenderer implements EventRendererStrategy {
   /**
    * Handle drag move event
    */
-  public handleDragMove(eventId: string, snappedY: number, column: string, mouseOffset: any): void {
+  public handleDragMove(eventId: string, snappedY: number, column: string, mouseOffset: DragOffset): void {
     if (!this.draggedClone) return;
 
     // Update position
@@ -259,7 +260,7 @@ export abstract class BaseEventRenderer implements EventRendererStrategy {
         const allStackEventIds: Set<string> = new Set();
 
         // Recursive funktion til at traversere stack chain
-        const traverseStack = (linkData: any, visitedIds: Set<string>) => {
+        const traverseStack = (linkData: StackLinkData, visitedIds: Set<string>) => {
           if (linkData.prev && !visitedIds.has(linkData.prev)) {
             visitedIds.add(linkData.prev);
             const prevElement = document.querySelector(`swp-time-grid [data-event-id="${linkData.prev}"]`) as HTMLElement;
diff --git a/src/renderers/EventRendererManager.ts b/src/renderers/EventRendererManager.ts
index 2f3fcf2..73c9166 100644
--- a/src/renderers/EventRendererManager.ts
+++ b/src/renderers/EventRendererManager.ts
@@ -275,7 +275,7 @@ export class EventRenderingService {
     /**
      * Handle conversion from all-day event to time event
      */
-    private handleConvertToTimeEvent(draggedElement: HTMLElement, mousePosition: any, column: string): void {
+    private handleConvertToTimeEvent(draggedElement: HTMLElement, mousePosition: { x: number; y: number }, column: string): void {
         // Use the provided draggedElement directly
         const allDayClone = draggedElement;
         const draggedEventId = draggedElement?.dataset.eventId?.replace('clone-', '') || '';
diff --git a/src/renderers/GridStyleManager.ts b/src/renderers/GridStyleManager.ts
index bc97604..ec95154 100644
--- a/src/renderers/GridStyleManager.ts
+++ b/src/renderers/GridStyleManager.ts
@@ -1,6 +1,16 @@
 import { calendarConfig } from '../core/CalendarConfig';
 import { ResourceCalendarData } from '../types/CalendarTypes';
 
+interface GridSettings {
+  hourHeight: number;
+  snapInterval: number;
+  dayStartHour: number;
+  dayEndHour: number;
+  workStartHour: number;
+  workEndHour: number;
+  fitToWidth?: boolean;
+}
+
 /**
  * GridStyleManager - Manages CSS variables and styling for the grid
  * Separated from GridManager to follow Single Responsibility Principle
@@ -38,7 +48,7 @@ export class GridStyleManager {
   /**
    * Set time-related CSS variables
    */
-  private setTimeVariables(root: HTMLElement, gridSettings: any): void {
+  private setTimeVariables(root: HTMLElement, gridSettings: GridSettings): void {
     root.style.setProperty('--hour-height', `${gridSettings.hourHeight}px`);
     root.style.setProperty('--minute-height', `${gridSettings.hourHeight / 60}px`);
     root.style.setProperty('--snap-interval', gridSettings.snapInterval.toString());
@@ -76,7 +86,7 @@ export class GridStyleManager {
   /**
    * Set column width based on fitToWidth setting
    */
-  private setColumnWidth(root: HTMLElement, gridSettings: any): void {
+  private setColumnWidth(root: HTMLElement, gridSettings: GridSettings): void {
     if (gridSettings.fitToWidth) {
       root.style.setProperty('--day-column-min-width', '50px'); // Small min-width allows columns to fit available space
     } else {
diff --git a/src/strategies/MonthViewStrategy.ts b/src/strategies/MonthViewStrategy.ts
index c73642f..944503b 100644
--- a/src/strategies/MonthViewStrategy.ts
+++ b/src/strategies/MonthViewStrategy.ts
@@ -6,6 +6,7 @@
 import { ViewStrategy, ViewContext, ViewLayoutConfig } from './ViewStrategy';
 import { DateCalculator } from '../utils/DateCalculator';
 import { calendarConfig } from '../core/CalendarConfig';
+import { CalendarEvent } from '../types/CalendarTypes';
 
 export class MonthViewStrategy implements ViewStrategy {
   private dateCalculator: DateCalculator;
@@ -113,7 +114,7 @@ export class MonthViewStrategy implements ViewStrategy {
     return dates;
   }
   
-  private renderMonthEvents(container: HTMLElement, events: any[]): void {
+  private renderMonthEvents(container: HTMLElement, events: CalendarEvent[]): void {
     // TODO: Implement month event rendering
     // Events will be small blocks in day cells
   }
diff --git a/src/types/CalendarTypes.ts b/src/types/CalendarTypes.ts
index 4e6d5e2..7ae63b5 100644
--- a/src/types/CalendarTypes.ts
+++ b/src/types/CalendarTypes.ts
@@ -80,7 +80,7 @@ export interface CalendarConfig {
 
 export interface EventLogEntry {
   type: string;
-  detail: any;
+  detail: unknown;
   timestamp: number;
 }
 
@@ -94,7 +94,7 @@ export interface IEventBus {
   on(eventType: string, handler: EventListener, options?: AddEventListenerOptions): () => void;
   once(eventType: string, handler: EventListener): () => void;
   off(eventType: string, handler: EventListener): void;
-  emit(eventType: string, detail?: any): boolean;
+  emit(eventType: string, detail?: unknown): boolean;
   getEventLog(eventType?: string): EventLogEntry[];
   setDebug(enabled: boolean): void;
   destroy(): void;
diff --git a/src/types/DragDropTypes.ts b/src/types/DragDropTypes.ts
new file mode 100644
index 0000000..1297d83
--- /dev/null
+++ b/src/types/DragDropTypes.ts
@@ -0,0 +1,47 @@
+/**
+ * Type definitions for drag and drop functionality
+ */
+
+export interface MousePosition {
+  x: number;
+  y: number;
+  clientX?: number;
+  clientY?: number;
+}
+
+export interface DragOffset {
+  x: number;
+  y: number;
+  offsetX?: number;
+  offsetY?: number;
+}
+
+export interface DragState {
+  isDragging: boolean;
+  draggedElement: HTMLElement | null;
+  draggedClone: HTMLElement | null;
+  eventId: string | null;
+  startColumn: string | null;
+  currentColumn: string | null;
+  mouseOffset: DragOffset;
+}
+
+export interface DragEndPosition {
+  column: string;
+  y: number;
+  snappedY: number;
+  time?: Date;
+}
+
+export interface StackLinkData {
+  prev?: string;
+  next?: string;
+  isFirst?: boolean;
+  isLast?: boolean;
+}
+
+export interface DragEventHandlers {
+  handleDragStart?(originalElement: HTMLElement, eventId: string, mouseOffset: DragOffset, column: string): void;
+  handleDragMove?(eventId: string, snappedY: number, column: string, mouseOffset: DragOffset): void;
+  handleDragEnd?(eventId: string, originalElement: HTMLElement, draggedClone: HTMLElement, finalColumn: string, finalY: number): void;
+}
\ No newline at end of file
diff --git a/src/types/EventPayloadMap.ts b/src/types/EventPayloadMap.ts
new file mode 100644
index 0000000..d9393ad
--- /dev/null
+++ b/src/types/EventPayloadMap.ts
@@ -0,0 +1,177 @@
+import { CalendarEvent, CalendarView } from './CalendarTypes';
+import { 
+  DragStartEventPayload, 
+  DragMoveEventPayload, 
+  DragEndEventPayload,
+  DragMouseEnterHeaderEventPayload,
+  DragMouseLeaveHeaderEventPayload,
+  HeaderReadyEventPayload
+} from './EventTypes';
+import { CoreEvents } from '../constants/CoreEvents';
+
+/**
+ * Complete type mapping for all calendar events
+ * This enables type-safe event emission and handling
+ */
+export interface CalendarEventPayloadMap {
+  // Lifecycle events
+  [CoreEvents.INITIALIZED]: {
+    initialized: boolean;
+    timestamp: number;
+  };
+  [CoreEvents.READY]: undefined;
+  [CoreEvents.DESTROYED]: undefined;
+  
+  // View events
+  [CoreEvents.VIEW_CHANGED]: {
+    view: CalendarView;
+    previousView?: CalendarView;
+  };
+  [CoreEvents.VIEW_RENDERED]: {
+    view: CalendarView;
+  };
+  [CoreEvents.WORKWEEK_CHANGED]: {
+    settings: unknown;
+  };
+  
+  // Navigation events
+  [CoreEvents.DATE_CHANGED]: {
+    date: Date;
+    view?: CalendarView;
+  };
+  [CoreEvents.NAVIGATION_COMPLETED]: {
+    direction: 'previous' | 'next' | 'today';
+  };
+  [CoreEvents.PERIOD_INFO_UPDATE]: {
+    label: string;
+    startDate: Date;
+    endDate: Date;
+  };
+  [CoreEvents.NAVIGATE_TO_EVENT]: {
+    eventId: string;
+  };
+  
+  // Data events
+  [CoreEvents.DATA_LOADING]: undefined;
+  [CoreEvents.DATA_LOADED]: {
+    events: CalendarEvent[];
+    count: number;
+  };
+  [CoreEvents.DATA_ERROR]: {
+    error: Error;
+  };
+  [CoreEvents.EVENTS_FILTERED]: {
+    filteredEvents: CalendarEvent[];
+  };
+  
+  // Grid events
+  [CoreEvents.GRID_RENDERED]: {
+    container: HTMLElement;
+    currentDate: Date;
+    startDate: Date;
+    endDate: Date;
+    columnCount: number;
+  };
+  [CoreEvents.GRID_CLICKED]: {
+    column: string;
+    row: number;
+  };
+  [CoreEvents.CELL_SELECTED]: {
+    cell: HTMLElement;
+  };
+  
+  // Event management
+  [CoreEvents.EVENT_CREATED]: {
+    event: CalendarEvent;
+  };
+  [CoreEvents.EVENT_UPDATED]: {
+    event: CalendarEvent;
+    previousData?: Partial<CalendarEvent>;
+  };
+  [CoreEvents.EVENT_DELETED]: {
+    eventId: string;
+  };
+  [CoreEvents.EVENT_SELECTED]: {
+    eventId: string;
+    event?: CalendarEvent;
+  };
+  
+  // System events
+  [CoreEvents.ERROR]: {
+    error: Error;
+    context?: string;
+  };
+  [CoreEvents.REFRESH_REQUESTED]: {
+    view?: CalendarView;
+    date?: Date;
+  };
+  
+  // Filter events
+  [CoreEvents.FILTER_CHANGED]: {
+    activeFilters: string[];
+    visibleEvents: CalendarEvent[];
+  };
+  
+  // Rendering events
+  [CoreEvents.EVENTS_RENDERED]: {
+    eventCount: number;
+  };
+  
+  // Drag events
+  'drag:start': DragStartEventPayload;
+  'drag:move': DragMoveEventPayload;
+  'drag:end': DragEndEventPayload;
+  'drag:mouseenter-header': DragMouseEnterHeaderEventPayload;
+  'drag:mouseleave-header': DragMouseLeaveHeaderEventPayload;
+  'drag:cancelled': {
+    reason: string;
+  };
+  
+  // Header events
+  'header:ready': HeaderReadyEventPayload;
+  'header:height-changed': {
+    height: number;
+    rowCount: number;
+  };
+  
+  // All-day events
+  'allday:checkHeight': undefined;
+  'allday:convert-to-allday': {
+    eventId: string;
+    element: HTMLElement;
+  };
+  'allday:convert-from-allday': {
+    eventId: string;
+    element: HTMLElement;
+  };
+  
+  // Scroll events
+  'scroll:sync': {
+    scrollTop: number;
+    source: string;
+  };
+  'scroll:to-hour': {
+    hour: number;
+  };
+  
+  // Filter events
+  'filter:updated': {
+    activeFilters: string[];
+    visibleEvents: CalendarEvent[];
+  };
+  'filter:search': {
+    query: string;
+    results: CalendarEvent[];
+  };
+}
+
+// Helper type to get payload type for a specific event
+export type EventPayload<T extends keyof CalendarEventPayloadMap> = CalendarEventPayloadMap[T];
+
+// Type guard to check if an event has a payload
+export function hasPayload<T extends keyof CalendarEventPayloadMap>(
+  eventType: T,
+  payload: unknown
+): payload is CalendarEventPayloadMap[T] {
+  return payload !== undefined;
+}
\ No newline at end of file
diff --git a/src/types/ManagerTypes.ts b/src/types/ManagerTypes.ts
new file mode 100644
index 0000000..89f3582
--- /dev/null
+++ b/src/types/ManagerTypes.ts
@@ -0,0 +1,92 @@
+import { IEventBus, CalendarEvent, CalendarView } from './CalendarTypes';
+import { IManager } from '../interfaces/IManager';
+
+/**
+ * Complete type definition for all managers returned by ManagerFactory
+ */
+export interface CalendarManagers {
+  eventManager: EventManager;
+  eventRenderer: EventRenderingService;
+  gridManager: GridManager;
+  scrollManager: ScrollManager;
+  navigationManager: unknown; // Avoid interface conflicts
+  viewManager: ViewManager;
+  calendarManager: CalendarManager;
+  dragDropManager: unknown; // Avoid interface conflicts
+  allDayManager: unknown; // Avoid interface conflicts
+}
+
+export interface EventManager extends IManager {
+  loadData(): Promise<void>;
+  getEvents(): CalendarEvent[];
+  getEventsForPeriod(startDate: Date, endDate: Date): CalendarEvent[];
+  getResourceData(): ResourceData | null;
+  navigateToEvent(eventId: string): boolean;
+}
+
+export interface EventRenderingService extends IManager {
+  // EventRenderingService doesn't have a render method in current implementation
+}
+
+export interface GridManager extends IManager {
+  render(): Promise<void>;
+  getDisplayDates(): Date[];
+  setResourceData(resourceData: import('./CalendarTypes').ResourceCalendarData | null): void;
+}
+
+export interface ScrollManager extends IManager {
+  scrollTo(scrollTop: number): void;
+  scrollToHour(hour: number): void;
+}
+
+// Use a more flexible interface that matches actual implementation
+export interface NavigationManager extends IManager {
+  [key: string]: unknown; // Allow any properties from actual implementation
+}
+
+export interface ViewManager extends IManager {
+  // ViewManager doesn't have setView in current implementation
+  getCurrentView?(): CalendarView;
+}
+
+export interface CalendarManager extends IManager {
+  setView(view: CalendarView): void;
+  setCurrentDate(date: Date): void;
+  getInitializationReport(): InitializationReport;
+}
+
+export interface DragDropManager extends IManager {
+  // DragDropManager has different interface in current implementation
+}
+
+export interface AllDayManager extends IManager {
+  [key: string]: unknown; // Allow any properties from actual implementation
+}
+
+export interface ResourceData {
+  resources: Resource[];
+  assignments?: ResourceAssignment[];
+}
+
+export interface Resource {
+  id: string;
+  name: string;
+  type?: string;
+  color?: string;
+}
+
+export interface ResourceAssignment {
+  resourceId: string;
+  eventId: string;
+}
+
+export interface InitializationReport {
+  initialized: boolean;
+  timestamp: number;
+  managers: {
+    [key: string]: {
+      initialized: boolean;
+      error?: string;
+    };
+  };
+}
\ No newline at end of file
diff --git a/src/utils/PositionUtils.ts b/src/utils/PositionUtils.ts
index 1718033..b8281b3 100644
--- a/src/utils/PositionUtils.ts
+++ b/src/utils/PositionUtils.ts
@@ -1,5 +1,5 @@
-import { calendarConfig } from '../core/CalendarConfig.js';
-import { DateCalculator } from './DateCalculator.js';
+import { calendarConfig } from '../core/CalendarConfig';
+import { DateCalculator } from './DateCalculator';
 
 /**
  * PositionUtils - Static positioning utilities using singleton calendarConfig