fix missing error

Author: Andarist

src/compiler/checker.ts

@@ -40441,8 +40441,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 grammarErrorOnNode(left, Diagnostics._0_and_1_operations_cannot_be_mixed_without_parentheses, tokenToString(SyntaxKind.QuestionQuestionToken), tokenToString(operatorToken.kind));
             }
         }
-        else if (isBinaryExpression(node.left) && node.left.operatorToken.kind === SyntaxKind.BarBarToken) {
-            grammarErrorOnNode(node.left, Diagnostics._0_and_1_operations_cannot_be_mixed_without_parentheses, tokenToString(node.left.operatorToken.kind), tokenToString(SyntaxKind.QuestionQuestionToken));
+        else if (isBinaryExpression(node.left)) {
+            const { operatorToken } = node.left;
+            if (operatorToken.kind === SyntaxKind.BarBarToken || operatorToken.kind === SyntaxKind.AmpersandAmpersandToken) {
+                grammarErrorOnNode(node.left, Diagnostics._0_and_1_operations_cannot_be_mixed_without_parentheses, tokenToString(operatorToken.kind), tokenToString(SyntaxKind.QuestionQuestionToken));
+            }
         }
         else if (isBinaryExpression(node.right) && node.right.operatorToken.kind === SyntaxKind.AmpersandAmpersandToken) {
             grammarErrorOnNode(node.right, Diagnostics._0_and_1_operations_cannot_be_mixed_without_parentheses, tokenToString(SyntaxKind.QuestionQuestionToken), tokenToString(node.right.operatorToken.kind));

tests/baselines/reference/nullishCoalescingOperator5.errors.txt

@@ -1,9 +1,10 @@
 nullishCoalescingOperator5.ts(6,1): error TS5076: '??' and '||' operations cannot be mixed without parentheses.
 nullishCoalescingOperator5.ts(9,1): error TS5076: '||' and '??' operations cannot be mixed without parentheses.
 nullishCoalescingOperator5.ts(12,6): error TS5076: '??' and '&&' operations cannot be mixed without parentheses.
+nullishCoalescingOperator5.ts(15,1): error TS5076: '&&' and '??' operations cannot be mixed without parentheses.
 
 
-==== nullishCoalescingOperator5.ts (3 errors) ====
+==== nullishCoalescingOperator5.ts (4 errors) ====
     declare const a: string | undefined
     declare const b: string | undefined
     declare const c: string | undefined
@@ -25,6 +26,8 @@ nullishCoalescingOperator5.ts(12,6): error TS5076: '??' and '&&' operations cann
 
     // should be a syntax error
     a && b ?? c;
+    ~~~~~~
+!!! error TS5076: '&&' and '??' operations cannot be mixed without parentheses.
 
     // Valid according to spec
     a ?? (b || c);