Function parseUpdateExpression

test/fixtures/snapshot/typescript.js:35051–35068

* Parse ES7 UpdateExpression. UpdateExpression is used instead of ES6's PostFixExpression. * * ES7 UpdateExpression[yield]: * 1) LeftHandSideExpression[?yield] * 2) LeftHandSideExpression[?yield] [[no LineTerminator here]]++ * 3) LeftHandSi

()

         * In TypeScript (2), (3) are parsed as PostfixUnaryExpression. (4), (5) are parsed as PrefixUnaryExpression
         */
        function parseUpdateExpression() {
            if (token() === 45 /* SyntaxKind.PlusPlusToken */ || token() === 46 /* SyntaxKind.MinusMinusToken */) {
                var pos = getNodePos();
                return finishNode(factory.createPrefixUnaryExpression(token(), nextTokenAnd(parseLeftHandSideExpressionOrHigher)), pos);
            }
            else if (languageVariant === 1 /* LanguageVariant.JSX */ && token() === 29 /* SyntaxKind.LessThanToken */ && lookAhead(nextTokenIsIdentifierOrKeywordOrGreaterThan)) {
                // JSXElement is part of primaryExpression
                return parseJsxElementOrSelfClosingElementOrFragment(/*inExpressionContext*/ true);
            }
            var expression = parseLeftHandSideExpressionOrHigher();
            ts.Debug.assert(ts.isLeftHandSideExpression(expression));
            if ((token() === 45 /* SyntaxKind.PlusPlusToken */ || token() === 46 /* SyntaxKind.MinusMinusToken */) && !scanner.hasPrecedingLineBreak()) {
                var operator = token();
                nextToken();
                return finishNode(factory.createPostfixUnaryExpression(expression, operator), expression.pos);
            }
            return expression;
        }
        function parseLeftHandSideExpressionOrHigher() {
            // Original Ecma:
            // LeftHandSideExpression: See 11.2