Using the raw parameter within the options of the writeFile method, this tool works with the sending of png images, it has not been tested with other files, but I think this solution will work for others as well.

```
writePng(fileNamePng:string,base64Png:any,commitMsg:string=''){
    let initialMessage=commitMsg||'Commit de '+base64Png;
    let option = {encode:false,raw:true}
    const promise = this.bagRepo.writeFile('master', base64Png, base64Png, initialMessage, option);
    promise.then((valor:any) => {
      // console.log(valor);
    },this.initRepo);
    return promise;
  }
```