Type Alias CompanionActionSchema<TOptions, TResult>

CompanionActionSchema: [TResult] extends [JsonValue]
    ? CompanionActionSchemaWithResult<TOptions, TResult>
    : [TResult] extends [void]
        ? CompanionActionSchemaWithoutResult<TOptions>
        : never

Two kinds of action can be described:

CompanionActionSchemaWithResult: an action with indicated options that produces a result
CompanionActionSchemaWithoutResult: an action with indicated options that produces no result