The Transformation Object

The transformations object contains a series of key value pairs which define different state transformations. These objects contain action, middleware, payloadTypes, and reducer keys.

createModule uses these definitions to generate action creators, constants, the final reducer, and more.

{
  create: {
    middleware: [
      middlware.propCheck(shape({ description: PropTypes.string }))
    ],
    reducer: (state, { payload }) =>
      state.push(fromJS(payload)),
  }
}

Example transformation object

Usage

transformations: { [transformationName]{type, namespaced, middleware*, reducer} }

transformationName

string

This represents:

the action creator name: module.actions.transformationName
the constant name: module.constants.transformationName
the default action type: moduleName/transformationName

This type can be overridden by using the type key.

type

string

optional

The type key can be used to rename the action type. Specifying a type does not change the name of the generated constants and action creators. The generated constants and action creators are always based on the transformationName

middleware

[function({ type, payload, meta }) => { type, payload, meta }]

optional

Middleware is an array of functions that receive {type, payload, meta} and return {type, payload, meta}. These functions can be used to decorate the action before it's received by the reducer.

reducer

function(state, action)

default: state => state

optional

This is the state transformation associated to the action.

Transformation Objects