state-transducer/src/properties.js

Extended Hierarchical State Transducer library

export const CONTRACT_MODEL_UPDATE_FN_RETURN_VALUE =
  `Model update function must return valid update operations!`;
export const SEP = '.';
export const TRANSITION_SYMBOL = `-->`;
export const TRANSITION_LABEL_START_SYMBOL = `:`;
export const HISTORY_STATE_NAME = "H";
export const HISTORY_PREFIX = 'history.'
// CONSTANTS
export const INIT_STATE = 'nok';
export const INIT_EVENT = 'init';
export const AUTO_EVENT = 'auto';
export const STATE_PROTOTYPE_NAME = 'State'; // !!must be the function name for the constructor State,
// i.e. State
export const NO_STATE_UPDATE = [];
// NOTE : this really cannot be anything else than a falsy value, beware
export const NO_OUTPUT = null;
export const ACTION_IDENTITY = function ACTION_IDENTITY(){
  return {
    outputs : NO_OUTPUT,
    updates : NO_STATE_UPDATE
  }
}
export const history_symbol = {};
export const SHALLOW = 'shallow';
export const DEEP = 'deep';

export const WRONG_EVENT_FORMAT_ERROR = `The machine received an event which does not have the proper format. Expecting an object whose unique key is the event name, and value is the event data.`
export const FUNCTION_THREW_ERROR = (fnName, type) => `Exception thrown when executing ${type} ${fnName||""}`
export const INVALID_ACTION_FACTORY_EXECUTED = (actionName, type) => `${FUNCTION_THREW_ERROR(actionName, type)}\nThe ${type} returned a value which is not an action.`
export const INVALID_PREDICATE_EXECUTED = (actionName, type) => `${FUNCTION_THREW_ERROR(actionName, type)}\nThe ${type} returned a value which is not a boolean.`
export const ACTION_FACTORY_DESC = `action factory`
export const ENTRY_ACTION_FACTORY_DESC = `(decorating) entry action`
export const UPDATE_STATE_FN_DESC = `update state function`
export const PREDICATE_DESC = `predicate`