@SuppressWarnings("unchecked")
    public T setNewlinePrefix(String newlinePrefix) {
        currentState.newlinePrefix = newlinePrefix;
        return (T) this;
    }
Sets a prefix to prepend to every line after a new line is added
(except for an inserted trailing newline).

@param newlinePrefix Newline prefix to use.
@return Returns self.
smithy-utils/src/main/java/software/amazon/smithy/utils/AbstractCodeWriter.java