diff --git a/index.d.ts b/index.d.ts
index edbe260..d81a141 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -306,11 +306,70 @@ export interface HookContext extends GetHookData, PostHookData {
      * @param iso8859 iso string
      */
     iso8859ToUtf8(iso8859: string): string
+
+    /**
+     * convert image from source file to target file with filters
+     *
+     * @param sourceFile
+     * @param targetFile
+     * @param filters
+     */
+    imageFilter(
+        sourceFile: string,
+        targetFile: string,
+        filters: {
+            fit?: boolean
+            fill?: boolean
+            width?: number
+            height?: number
+            brightness?: number
+            saturation?: number
+            contrast?: number
+            gamma?: number
+            blur?: number
+            sharpen?: number
+            invert?: boolean
+            grayscale?: boolean
+            quality?: number
+        }[]
+    ): void
+
+    /**
+     * stat file or directory
+     *
+     * @param path
+     */
+    fsStat(path: string): {
+        name: string
+        size: number
+        isDir: boolean
+        modTime: string
+    }
+
+    /**
+     * list directory entries
+     *
+     * @param path
+     */
+    fsReadDir(path: string): {
+        name: string
+        size: number
+        isDir: boolean
+        modTime: string
+    }[]
+
+    /**
+     * make directory and all missing sub directories, no error if directory already exists
+     *
+     * @param path
+     */
+    fsMkDir(path: string): void
 }
 
 export interface HookException {
     status?: number
     html?: string
+    file?: string
     [key: string]: any
 }
 
@@ -321,4 +380,4 @@ export interface HookResponse extends GetHookData, PostHookData {
 
 declare global {
     var context: HookContext
-}
\ No newline at end of file
+}