nodejs buildgif fragment

gistfile1.txt

    async function buildGIF(frames: any) {
        let firstFrame = new PNG(frames[0].dataBytes);
        let width = firstFrame.width;
        let height = firstFrame.height;
        //console.log(frames.length + " frames at " + width + "x" + height);
        let encoder = new GIFEncoder(width, height);
        encoder.createReadStream().pipe(fS.createWriteStream('output.gif'));
        encoder.start();

        let framePromises = frames.map(async (frame: any) => {
            return await new Promise((resolve: any, reject: any) => {
                let parsedFrame = new PNG(frame.dataBytes);
                parsedFrame.decode((px: any) => {
                    resolve(px);
                });
            }).catch(e => {
                //console.log(e);
            });
        });

        for (let framePromise of framePromises) {
            encoder.addFrame(await
                framePromise
            );
        }

        encoder.finish();
    };