ContainsEnvVariables returns true if inBytes contains environment variable replace patterns.

ContainsFunctionVariables returns true if inBytes contains function variable replace patterns.

NewInterpolatedBytes returns a type that evaluates function interpolations on a provided byte slice each time Get is called.

NewInterpolatedString returns a type that evaluates function interpolations on a provided string each time Get is called.

ReplaceEnvVariables will search a blob of data for the pattern `${FOO:bar}`, where `FOO` is an environment variable name and `bar` is a default value.

ReplaceFunctionVariables will search a blob of data for the pattern `${!foo}`, where `foo` is a function name.

ReplaceFunctionVariablesEscaped will search a blob of data for the pattern `${!foo}`, where `foo` is a function name.

InterpolatedBytes holds a byte slice that potentially has interpolation functions.

InterpolatedString holds a string that potentially has interpolation functions.

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