How to get file buffer from file

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I did a Backend code using buffer and base64:

import { mediaManager } from ‘wix-media-backend’ ;
import { Buffer } from ‘buffer’ //const buf1 = Buffer.alloc(10); require is to Browserify

export function beFileUpload ( fileName , image64 ) {
console . log ( “BE->beFileUpload: url” , fileName , image64 . length , image64 )

**let**  file  =  image64 . split ( "," )  //'data:video/mp4;base64,PZZGHYHGG....' => file[0] = data:video/mp4;base64 file[1] = PZZGHYHGG.... 
**let**  header  =  file [ 0 ]  // file[0] = data:video/mp4;base64 
**let**  data  =  file [ 1 ]  // file[1] = PZZGHYHGG.... 

**let**  mimeType  =  header . split ( ";" )[ 0 ]. split ( ":" )[ 1 ]  // video/mp4  
**let**  mediaType  =  header . split ( "/" )[ 0 ]. split ( ":" )[ 1 ]  // mp4 
console . log ( '"be header:' ,  header ,  mimeType ,  mediaType ) 
console . log ( "BE url without mime" ,  data . length ) 

**let**  image  =  Buffer . **from** ( data ,  "base64" ) 
console . log ( "BE buffer.length" ,  image . length ) 
console . log ( "p1 started" ,  fileName ,  image . length ,  mimeType ,  mediaType ) 
**return**  mediaManager . upload ( 
        "/myUploadFolder/buffer" , 
        image , 
        fileName , { 
            "mediaOptions" : { 
                "mimeType" :  mimeType ,  //"image/png" 
                "mediaType" :  mediaType  //"image" 
            }, 
            "metadataOptions" : { 
                "isPrivate" :  **false** , 
                "isVisitorUpload" :  **false** , 
                "context" : { 
                    "someKey1" :  "someValue1" , 
                    "someKey2" :  "someValue2" 
                } 
            } 
        } 
    ) 
    . then ( result  => { 
        console . log ( "p1 then" ,  result ) 
        **return**  result 
    }) 
    . **catch** ( err  => { 
        console . log ( "p1 catch" ,  err ) 
        **return**  err 
    })

}

Hope this help.
The image need to be a base64 encoded.