diff --git a/types/index.d.ts b/types/index.d.ts
index 78543dc0c..fd45e9e1f 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -169,10 +169,15 @@ declare module "jspdf" {
     ): HTMLWorker;
     progress: HTMLWorkerProgress;
     error(msg: string): void;
-    save(filename: string): void;
+    save(filename: string): Promise<void>;
     set(opt: HTMLOptions): HTMLWorker;
     get(key: "string"): HTMLWorker;
     get(key: "string", cbk: (value: string) => void): string;
+    doCallback(): Promise<void>;
+    outputImg(
+      type: "img" | "datauristring" | "dataurlstring" | "datauri" | "dataurl"
+    ): Promise<string>;
+    outputPdf: jsPDF["output"];
   }
 
   export interface HTMLOptionImage {
@@ -502,6 +507,19 @@ declare module "jspdf" {
     | "Separation"
     | "DeviceN";
 
+  export type ImageFormat =
+    | "RGBA"
+    | "UNKNOWN"
+    | "PNG"
+    | "TIFF"
+    | "JPG"
+    | "JPEG"
+    | "JPEG2000"
+    | "GIF87a"
+    | "GIF89a"
+    | "WEBP"
+    | "BMP";
+
   export interface ImageOptions {
     imageData:
       | string
@@ -516,6 +534,7 @@ declare module "jspdf" {
     alias?: string;
     compression?: ImageCompression;
     rotation?: number;
+    format?: ImageFormat;
   }
   export interface ImageProperties {
     alias: number;
@@ -531,6 +550,7 @@ declare module "jspdf" {
     predictor?: number;
     index: number;
     data: string;
+    fileType: ImageFormat;
   }
 
   export interface TextOptionsLight {
@@ -1077,7 +1097,7 @@ declare module "jspdf" {
     ): void;
 
     // jsPDF plugin: html
-    html(src: string | HTMLElement, options?: HTMLOptions): Promise<HTMLWorker>;
+    html(src: string | HTMLElement, options?: HTMLOptions): HTMLWorker;
 
     // jsPDF plugin: JavaScript
     addJS(javascript: string): jsPDF;