NewField attempts to parse and create a dynamic field expression from a string.

NewMapping attempts to parse and create a Bloblang mapping from a string.

Field represents a Benthos dynamic field expression, used to configure string fields where the contents should change based on the contents of messages and other factors.

Mapping is a parsed Bloblang mapping.

Message is an interface type to be given to a function interpolator, it allows the function to resolve fields and metadata from a message.