Return value of function without any `return` statement should not be used

This rule applies when return value is used even though the function has no return statement.

In such a case, it could be a programmer's mistake forgetting a return statement.

Note: This rule applies only when the return value is assigned to an object property because in other cases, it is often intended or harmless.

-Noncompliant Code Example
+Compliant Code Example
 function add(x, y) {
-  x + y;
+  return x + y;
 }
-obj.total = add(1, 2); // MISSING_RETURN_VALUE alarm because function 'add' does not return a value.
+obj.total = add(1, 2);

Noncompliant Code Example

function add(x, y) {
  x + y;
}
obj.total = add(1, 2); // MISSING_RETURN_VALUE alarm because function 'add' does not return a value.

function add(x, y) {
  return x + y;
}
obj.total = add(1, 2);

This rule was introduced in DeepScan 1.0.0-alpha.