javascript - e.target.result empty in angular cli -


i need upload file system. worked, after moved angular cli, started give trouble. here's code:

reader.onload = function(e: any) {   var data = e.target.result;   console.log(data);   var result;   var workbook = xlsx.read(data, { type: 'binary' });   var sheet_name_list = workbook.sheetnames;    /* iterate through sheets */   sheet_name_list.foreach( function(y) {      //convert cell value json     var roa = xlsx.utils.sheet_to_json(workbook.sheets[y]);     if (roa.length > 0) {       result = roa;     }   });    result.foreach( element => {     if (element.permissao == "2") {       element.permissao = "usuário comum";     } else if (element.permissao == "1") {       element.permissao = "administrador";     }   });    //get first column first cell value;                   _component.validationfiles(result);  };

in console.log(data), looks this: arraybuffer {}

and when call readasarraybuffer(f), error:

error typeerror: f.charcodeat not function


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