Function checkGrammarForInvalidExclamationToken

test/fixtures/snapshot/typescript.js:88278–88280

(exclamationToken, message)

            return !!questionToken && grammarErrorOnNode(questionToken, message);
        }
        function checkGrammarForInvalidExclamationToken(exclamationToken, message) {
            return !!exclamationToken && grammarErrorOnNode(exclamationToken, message);
        }
        function checkGrammarObjectLiteralExpression(node, inDestructuring) {
            var seen = new ts.Map();
            for (var _i = 0, _a = node.properties; _i < _a.length; _i++) {