Function parseYieldExpression

test/fixtures/snapshot/typescript.js:34475–34491

()

            return !scanner.hasPrecedingLineBreak() && isIdentifier();
        }
        function parseYieldExpression() {
            var pos = getNodePos();
            // YieldExpression[In] :
            //      yield
            //      yield [no LineTerminator here] [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
            //      yield [no LineTerminator here] * [Lexical goal InputElementRegExp]AssignmentExpression[?In, Yield]
            nextToken();
            if (!scanner.hasPrecedingLineBreak() &&
                (token() === 41 /* SyntaxKind.AsteriskToken */ || isStartOfExpression())) {
                return finishNode(factory.createYieldExpression(parseOptionalToken(41 /* SyntaxKind.AsteriskToken */), parseAssignmentExpressionOrHigher()), pos);
            }
            else {
                // if the next token is not on the same line as yield.  or we don't have an '*' or
                // the start of an expression, then this is just a simple "yield" expression.
                return finishNode(factory.createYieldExpression(/*asteriskToken*/ undefined, /*expression*/ undefined), pos);
            }
        }
        function parseSimpleArrowFunctionExpression(pos, identifier, asyncModifier) {
            ts.Debug.assert(token() === 38 /* SyntaxKind.EqualsGreaterThanToken */, "parseSimpleArrowFunctionExpression should only have been called if we had a =>");
            var parameter = factory.createParameterDeclaration(