diff --git a/web/src/reader/core/reader-context.ts b/web/src/reader/core/reader-context.ts
index 7bb3264..f6fecdf 100644
--- a/web/src/reader/core/reader-context.ts
+++ b/web/src/reader/core/reader-context.ts
@@ -1,8 +1,5 @@
-import type { ReaderMetadata } from "../../types/reader";
 import { PageCalculationResult } from "../ebook/page-calculator";
 
-type ReaderType = "ebook" | "pdf" | "comic" | "manga";
-
 interface UniversalReader {
   type: "ebook";
   cif: any;
@@ -79,10 +76,12 @@ export function createReaderContext(
       progressDisplay: document.getElementById("progress-display"),
     },
     events: {
-      on: (event: string, handler: Function) => readerEvents.on(event, handler),
-      emit: (event: string, data?: any) => readerEvents.emit(event, data),
+      on: (event: ReaderEventType, handler: Function) =>
+        readerEvents.on(event, handler),
+      emit: (event: ReaderEventType, data?: any) =>
+        readerEvents.emit(event, data),
     },
   };
 }
 
-import { readerEvents } from "./reader-events";
+import { readerEvents, ReaderEventType } from "./reader-events";
diff --git a/web/src/reader/core/reader-navigation.ts b/web/src/reader/core/reader-navigation.ts
index c648100..68fa25b 100644
--- a/web/src/reader/core/reader-navigation.ts
+++ b/web/src/reader/core/reader-navigation.ts
@@ -6,7 +6,6 @@ import {
   calculatePagesForEbook,
   calculateProgressPercentage,
   getCurrentPageFromScroll,
-  getScrollPositionForPage,
   type PageCalculationResult,
 } from "../ebook/page-calculator";
 
diff --git a/web/src/reader/ebook/page-calculator.ts b/web/src/reader/ebook/page-calculator.ts
index 73a13c7..c9e83d5 100644
--- a/web/src/reader/ebook/page-calculator.ts
+++ b/web/src/reader/ebook/page-calculator.ts
@@ -6,6 +6,7 @@ export interface ChapterPageInfo {
   endPage: number;
   scrollHeight: number;
   charCount: number;
+  pagesInChapter: number;
 }
 
 export interface PageCalculationResult {
@@ -155,6 +156,7 @@ export async function calculatePagesForEbook(
         endPage: currentPage,
         scrollHeight: 0,
         charCount: 0,
+        pagesInChapter: 0,
       });
       continue;
     }
@@ -169,6 +171,7 @@ export async function calculatePagesForEbook(
         endPage: currentPage,
         scrollHeight: 0,
         charCount: 0,
+        pagesInChapter: 0,
       });
       continue;
     }
@@ -207,6 +210,7 @@ export async function calculatePagesForEbook(
       endPage: currentPage + pagesInChapter - 1,
       scrollHeight,
       charCount,
+      pagesInChapter,
     };
 
     chapters.push(chapterInfo);