You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: block_context.go
    path of file: ./repos/streamdal/apps/server/vendor/github.com/slack-go/slack
    
    the code of the file until where you have to start completion: package slack

// ContextBlock defines data that is used to display message context, which can
// include both images and text.
//
// More Infor
    
func NewContextBlock(blockID string, mixedElements ...MixedElement) *ContextBlock {
	elements := ContextElements{
		Elements: mixedElements,
	}
	return &ContextBlock{
		Type:            MBTContext,
		BlockID:         blockID,
		ContextElements: elements,
	}
}