Ignore undefined variables

[Thevyn]

Hi,

Is there a way to throw an error/ignore if one or more variables is undefined?

const formula = 'x > 100 and y > 100';
const variables =  { x: 120, y: undefined };
const v =  { x: 12, y: undefined };

const expr = parser.parse(formula);

console.log(expr.evaluate(variables));  
**output**: throws error Undefined variable y

console.log(expr.evaluate(v)); 
**output**: false, but i want it to throw an error here too.