How to fix error TS1251: Function declarations are not allowed inside blocks in strict mode...

I am having a code and getting the following error:

error TS1251: Function declarations are not allowed inside blocks in strict mode when targeting 'ES3' or 'ES5'. Class definitions are automatically in strict mode.

The code:

lineDraw(){
flag = true;
var point1, isDown, x1, y1, x2, y2, x, y;
var count = 0;
if (canvas != undefined) {
canvas.on('mouse:down', function (options) {
if (!mouseEvent){
count = 0;
drawFlag = true;
mouseEvent = true;
//point1 = undefined;
x = undefined;
y = undefined;
}
if (flag) {
getMouse(options);
}
});
function getMouse(options) {
var coords = {"x":{}, "y": {}};
var coords1 = {"x":{}, "y": {}};
let canvasElem = document.querySelector("canvas");
var bounds = canvasElem.getBoundingClientRect();
x = (options.e.clientX - bounds.left);
y = (options.e.clientY - bounds.top);
x /= bounds.width;
y /= bounds.height;
x *= canvas.width;
y *= canvas.height;
if (point1 === undefined) {
point1 = new fabric.Point(x, y)
} else {
var line = new fabric.Line([point1.x, point1.y, x, y], {
fill: 'red',
stroke: 'red',
strokeWidth: 5,
selectable: false,
evented: false,
objectCaching: false
});
canvas.add(line);
coords.x = parseFloat((point1.x / scaledWidth).toFixed(2));
coords.y = parseFloat((point1.y / scaledHeight).toFixed(2));
//coords.push((point1.x / (scaledWidth)).toFixed(2));
//coords.push((point1.y / scaledHeight).toFixed(2));
if (count == 0) {
myObj.points['point' + count] = (coords);
count = count + 1;
}
//console.log(y, scaledHeight);
coords1.x=parseFloat((x / scaledWidth).toFixed(2));
coords1.y=parseFloat((y / scaledHeight).toFixed(2));
myObj.points['point' + count] = coords1;
count = count + 1;
console.log('added', point1.x / scaledWidth, point1.y / scaledHeight, x / scaledWidth, y / scaledHeight)
point1.x = x;
point1.y = y;
canvas.setActiveObject(line);
}
}
}
else {
this._snackBar.open('Load Image first before drawing', 'Close', {
duration: 5000,
});
}
}


I am trying to access this function and getting this error.

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