function parseArgumentList()

in packages/core/nano/src/parser.ts [760:799]
35 lines of code
10 McCabe index (conditional complexity)

    function parseArgumentList(): R[] {
        const list: R[] = [];
        let nextArgPos = scanner.getWSTokenPos();
        let freshArgument = true;
        while (true) {
            if (isStartOfExpression(currentToken)) {
                // Only parse out an expected comma when we have
                // already parsed an expression for this argument
                // position and we come across another expression.
                // This assumes that a comma is not a valid start of
                // expression.
                if (!freshArgument) {
                    parseExpected(SyntaxKind.CommaToken);
                }
                list.push(parseExpression());
                freshArgument = parseOptional(SyntaxKind.CommaToken);
                if (freshArgument) {
                    nextArgPos = scanner.getWSTokenPos();
                }
                continue;
            }
            if (isListEnd()) {
                break;
            }
            if (parseOptional(SyntaxKind.CommaToken)) {
                if (freshArgument) {
                    list.push(algebra.missing(nextArgPos, algContext));
                }
                freshArgument = true;
                nextArgPos = scanner.getWSTokenPos();
                continue;
            }
            nextToken();
        }
        if (freshArgument && list.length > 0) {
            list.push(algebra.missing(nextArgPos, algContext));
        }
        parseExpected(SyntaxKind.CloseParenToken);
        return list;
    }