read xlsx file in angular 5

1//import it
2
3    import * as XLSX from 'ts-xlsx';
4
5//inside export class
6
7arrayBuffer:any;
8file:File;
9incomingfile(event) 
10  {
11  this.file= event.target.files[0]; 
12  }
13
14 Upload() {
15      let fileReader = new FileReader();
16        fileReader.onload = (e) => {
17            this.arrayBuffer = fileReader.result;
18            var data = new Uint8Array(this.arrayBuffer);
19            var arr = new Array();
20            for(var i = 0; i != data.length; ++i) arr[i] = String.fromCharCode(data[i]);
21            var bstr = arr.join("");
22            var workbook = XLSX.read(bstr, {type:"binary"});
23            var first_sheet_name = workbook.SheetNames[0];
24            var worksheet = workbook.Sheets[first_sheet_name];
25            console.log(XLSX.utils.sheet_to_json(worksheet,{raw:true}));
26        }
27        fileReader.readAsArrayBuffer(this.file);
28}