Can't delete digits when cursor at end of numeric section about angular-cc-library HOT 2 OPEN

try {
	cursor = target.selectionStart;
	if(cursor==4 || cursor==9 || cursor==14 || cursor==19){
		cursor++;
	}
} catch (error) {}

if(e instanceof KeyboardEvent && e.code.toUpperCase()=='DELETE')
	deleteKey = true;

try {
	cursor = target.selectionStart;
	if(deleteKey && (cursor==4 || cursor==9 || cursor==14 || cursor==19)){
		cursor++;
		// simulate another delete event by removing the character the user would have indented to delete
		let  preDeleteSegment = value.substring(0, cursor);
		let  postDeleteSegment = value.substring(cursor+1, value.length);
		value = preDeleteSegment+postDeleteSegment;
	}
} catch (error) {}