export function blobToDataURL(blob: Blob, type?: string): Promise<string> {
    var fileReader = new FileReader()
    fileReader.readAsDataURL(blob)
    return new Promise((resolve, reject) => {
        fileReader.onload = () => {
            let url = <string>fileReader.result

            if (type) {
                let i = url.indexOf(";")
                url = `data:${type}${url.slice(i)}`
            }
            resolve(url)
        }
    })
}