diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..4037e00
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,20 @@
+export interface JSImageCompressorOptions<T extends File = File> {
+  file: File;
+  quality?: number;
+  mimeType?: string;
+  maxWidth?: number;
+  maxHeight?: number;
+  width?: number;
+  height?: number;
+  minWidth?: number;
+  minHeight?: number;
+  convertSize?: number;
+  loose?: boolean;
+  redressOrientation?: boolean;
+  beforeCompress?: (file: T) => void;
+  success?: (file: T) => void;
+  error?: (msg: string) => void;
+}
+export default class JSImageCompressor<T extends File = File> {
+  constructor(options: JSImageCompressorOptions<T>) {}
+}
diff --git a/src/index.js b/src/index.js
index e86fabb..b3fd849 100644
--- a/src/index.js
+++ b/src/index.js
@@ -98,7 +98,7 @@ _proto.init = function () {
         _this.rendCanvas()
       }
     },
-    _this.error
+    _this.error.bind(_this)
   )
 }