/**
 * A command is something that can be run by an action. It is the smallest piece of executable code in the Skeletos
 * framework.
 *
 * Typically, you do not need to implement this interface yourself. You can simply call the functions:
 *
 * 1. AbstractAction.callFunctionSynchronously(mySyncFunc)
 * 2. AbstractAction.callFunctionAsynchronously(myAsyncFunc)
 * 3. AbstractAction.callAnotherAction(myAction)
 *
 * And these functions will return an ISkeletosCommand for the action to execute.
 */
export declare type ISkeletosCommand = (prevResultsOrCallback: async.ErrorCallback<Error> | any, callback?: async.ErrorCallback<Error>) => any;