Function checkAwaitExpression

test/fixtures/snapshot/typescript.js:78455–78463

(node)

            }
        }
        function checkAwaitExpression(node) {
            addLazyDiagnostic(function () { return checkAwaitExpressionGrammar(node); });
            var operandType = checkExpression(node.expression);
            var awaitedType = checkAwaitedType(operandType, /*withAlias*/ true, node, ts.Diagnostics.Type_of_await_operand_must_either_be_a_valid_promise_or_must_not_contain_a_callable_then_member);
            if (awaitedType === operandType && !isErrorType(awaitedType) && !(operandType.flags & 3 /* TypeFlags.AnyOrUnknown */)) {
                addErrorOrSuggestion(/*isError*/ false, ts.createDiagnosticForNode(node, ts.Diagnostics.await_has_no_effect_on_the_type_of_this_expression));
            }
            return awaitedType;
        }
        function checkPrefixUnaryExpression(node) {
            var operandType = checkExpression(node.operand);
            if (operandType === silentNeverType) {