Deflate() creating broken zip file

[Umisyus]

Hello, I'm using Pako to create zip files on image buffers as the following type: U8IntArray.
The problem occurs when I use Pako to push the data into the zip object, I check for the last item in my for loop, then I call the final push with data as my first arg and true as my second arg.

// "files" is an array of data, split in pieces... An array of buffers.
// Example:
// ArrayOfManyFiles = [MoreFiles,MoreFiles, ... etc. ]
// MoreFiles = [ {key: string, value: Buffer}, {key: string, value: Buffer} ... ]
// 
   return new Promise(async (res, rej) => {

        let zp = new pako.Deflate()
        let final = false;

        for await (let file of files) {
            let len = file.length
            for (let index = 0; index < file.length; index++) {
                const ff = file[index];

                log.info(`Zipping ${ff.key}`)
                let data = (ff.value as any).data as Buffer
                const fileBuffer = new Uint8Array(data);

                if (index == len - 1) {
                    final = true;
                }

                zp.push(fileBuffer, final)

                if (zp.err > 0) {
                    rej("ERROR: " + Error("invalid file! " + ff.key))
                }
            }
        }
        let result = zp.result
        res(result)
    })

Please help.