fixes bug

Author: latin-panda

packages/xpath/src/evaluations/NumberEvaluation.ts

@@ -18,6 +18,6 @@ export class NumberEvaluation<T extends XPathNode> extends ValueEvaluation<T, 'N
 
 		this.booleanValue = value !== 0 && !Number.isNaN(value);
 		this.numberValue = value;
-		this.stringValue = String(value);
+		this.stringValue = value == null || Number.isNaN(value) ? '' : String(value);
 	}
 }

packages/xpath/test/evaluator/Evaluator.test.ts

@@ -72,6 +72,8 @@ describe('Evaluator convenience methods', () => {
 			{ expression: '2', expected: '2' },
 			{ expression: '/root/a', expected: '3' },
 			{ expression: '/root/b', expected: '' },
+			{ expression: '/root/b', expected: '' },
+			{ expression: '3 div abc ', expected: '' },
 		])('evaluates $expression to boolean $expected', ({ expression, expected }) => {
 			const actual = evaluator.evaluateString(expression);