Function parseAssignmentExpression

lib/assets/javascripts/JSXTransformer.js:6419–6521

()

    }

    function parseAssignmentExpression() {
        var marker, expr, token, params, oldParenthesizedCount,
            startsWithParen = false, backtrackToken = lookahead,
            possiblyAsync = false;

        if (matchYield()) {
            return parseYieldExpression();
        }

        if (matchAwait()) {
            return parseAwaitExpression();
        }

        oldParenthesizedCount = state.parenthesizedCount;

        marker = markerCreate();

        if (matchAsyncFuncExprOrDecl()) {
            return parseFunctionExpression();
        }

        if (matchAsync()) {
            // We can't be completely sure that this 'async' token is
            // actually a contextual keyword modifying a function
            // expression, so we might have to un-lex() it later by
            // calling rewind(backtrackToken).
            possiblyAsync = true;
            lex();
        }

        if (match('(')) {
            token = lookahead2();
            if ((token.type === Token.Punctuator && token.value === ')') || token.value === '...') {
                params = parseParams();
                if (!match('=>')) {
                    throwUnexpected(lex());
                }
                params.async = possiblyAsync;
                return parseArrowFunctionExpression(params, marker);
            }
            startsWithParen = true;
        }

        token = lookahead;

        // If the 'async' keyword is not followed by a '(' character or an
        // identifier, then it can't be an arrow function modifier, and we
        // should interpret it as a normal identifer.
        if (possiblyAsync && !match('(') && token.type !== Token.Identifier) {
            possiblyAsync = false;
            rewind(backtrackToken);
        }

        expr = parseConditionalExpression();

        if (match('=>') &&
                (state.parenthesizedCount === oldParenthesizedCount ||
                state.parenthesizedCount === (oldParenthesizedCount + 1))) {