diff --git a/png-async/png-async-tests.ts b/png-async/png-async-tests.ts
new file mode 100644
index 000000000..6523089a2
--- /dev/null
+++ b/png-async/png-async-tests.ts
@@ -0,0 +1,32 @@
+/// <reference path="png-async.d.ts" />
+
+import fs = require('fs');
+import png = require('png-async');
+
+var devnull = process.platform === 'win32' ? 'nul' : '/dev/null';
+
+// stream test
+var img = new png.Image({
+    width: 1,
+    height: 1,
+    fill: true
+})
+    .pack()
+    .pipe(png.createImage({
+        deflateStrategy: png.EDeflateStrategy.FIXED,
+        filterType: png.EFilterType.Auto
+    })
+        .on('parsed', function () {
+
+            if (this.data[0] !== 0) {
+                throw new Error('invalid data');
+            }
+
+            this.data[0] = 255;
+            this.data[3] = 255;
+
+            this.pack().pipe(fs.createWriteStream(devnull)).on('finish', () => {
+                console.log('done');
+            });
+        })
+    );
diff --git a/png-async/png-async.d.ts b/png-async/png-async.d.ts
new file mode 100644
index 000000000..2898c4665
--- /dev/null
+++ b/png-async/png-async.d.ts
@@ -0,0 +1,58 @@
+// Type definitions for png-async
+// Project: https://github.com/kanreisa/node-png-async
+// Definitions by: Yuki KAN <https://github.com/kanreisa>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module 'png-async' {
+    import stream = require('stream');
+
+    export interface IImageOptions {
+        width?: number;
+        height?: number;
+        fill?: boolean;
+        checkCRC?: boolean;
+        deflateChunkSize?: number;
+        deflateLevel?: number;
+        deflateStrategy?: EDeflateStrategy;
+        filterType?: EFilterType;
+    }
+
+    export enum EDeflateStrategy {
+        DEFAULT_STRATEGY = 0,
+        FILTERED = 1,
+        HUFFMAN_ONLY = 2,
+        RLE = 3,
+        FIXED = 4,
+    }
+
+    export enum EFilterType {
+        Auto = -1,
+        None = 0,
+        Sub = 1,
+        Up = 2,
+        Average = 3,
+        Paeth = 4,
+    }
+
+    export function createImage(option?: IImageOptions): Image;
+
+    export class Image extends stream.Duplex {
+        width: number;
+        height: number;
+        gamma: number;
+        data: Buffer;
+        constructor(option?: IImageOptions);
+        pack(): Image;
+        parse(data: Buffer, callback?: (err: Error, image: Image) => void): Image;
+        write(data: any, cb?: any): boolean;
+        end(data?: any): void;
+        bitblt(dst: Image, sx: number, sy: number, w: number, h: number, dx: number, dy: number): Image;
+
+        on(event: string, listener: Function): Image;
+        once(event: string, listener: Function): Image;
+        removeListener(event: string, listener: Function): Image;
+        removeAllListeners(event: string): Image;
+    }
+}