Property 'callproducts' does not exist on type 'XMLHttpRequest'

Description: I used XMLHttpRequest in my project. I want to call another function when i get status.Below is my home.ts code.

home.ts

onFileSelected(event) is called when file is selected from input type, everything works fine except when i try to call this function
this.callproducts(data,0,c_altcode)

onFileSelected(event)

this.callproducts(data,0,c_altcode)

Please guide me how can i call this function

home.ts

home.ts

onFileSelected(event)

var file = event.target.files[0];
var url = window.URL.createObjectURL(file);
var oReq = new XMLHttpRequest();
oReq.open("GET", url, true);
oReq.responseType = "arraybuffer";

oReq.onload = function(e)
var arraybuffer = oReq.response;


var data = new Uint8Array(arraybuffer);

var arr = new Array();
for (var i = 0; i != data.length; ++i) arr[i] = String.fromCharCode(data[i]);
var bstr = arr.join("");


var workbook = XLSX.read(bstr,
type: "binary"
);


var first_sheet_name = workbook.SheetNames[0];


var worksheet = workbook.Sheets[first_sheet_name];


var final_arr = XLSX.utils.sheet_to_json(worksheet,
raw: true
);


if(oReq.status === 200)

if(final_arr[0].hasOwnProperty("Altcode"))

var c_altcode =final_arr[0].hasOwnProperty("Altcode");
// error comming in this line.
this.callproducts(data,0,c_altcode);





oReq.send(null);



// This is my `callproducts()` which i want to call.
callproducts(data,index,srch)

// some code here



Error: Property 'callproducts' does not exist on type 'XMLHttpRequest'.

callproducts

0

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