Function isStartOfMappedType

test/fixtures/snapshot/typescript.js:33774–33783

()

            return members;
        }
        function isStartOfMappedType() {
            nextToken();
            if (token() === 39 /* SyntaxKind.PlusToken */ || token() === 40 /* SyntaxKind.MinusToken */) {
                return nextToken() === 145 /* SyntaxKind.ReadonlyKeyword */;
            }
            if (token() === 145 /* SyntaxKind.ReadonlyKeyword */) {
                nextToken();
            }
            return token() === 22 /* SyntaxKind.OpenBracketToken */ && nextTokenIsIdentifier() && nextToken() === 101 /* SyntaxKind.InKeyword */;
        }
        function parseMappedTypeParameter() {
            var pos = getNodePos();
            var name = parseIdentifierName();