InvocationParameter

InvocationParameters supply values to either the command-line or environment variables.

sealed class InvocationParameter {
    class BooleanFlagParameter : InvocationParameter()
    class EnvironmentVariableParameter : InvocationParameter()
    class VariableInvocationParameter : InvocationParameter()
    class WordInvocationParameter : InvocationParameter()
}

Every parameter can run in one of two contexts. They produce a value when combined with a ApplicationParameter
and a AppParameterValue:

• Command line argument: Produces zero or more arguments for the command-line

• Environment variable: Produces exactly one value.

For each of the InvocationParameter types, we will describe the value(s) they produce. We will also highlight notable differences between CLI args and environment variables.