Version 3.2.0

• Changed default shouldUpdate algorithm

Version 3.1.0

• Microcosm::getInitialState() now accepts an options argument. This argument is passed down from the constructor.

Version 3.0.0

• Changed data update pattern to more closely match Om. This means that Microcosm::merge has been replaced with Microcosm::swap. Additionally, Microcosm::reset has been added to completely obliterate old state.
• Microcosm::addStore now only accepts one store at a time. It was not being utilized, gives poorer error handling, and makes let less clear the order in which Stores will process data.
• The internal class Heartbeat was replaced with pulse. Pulse is a function that can act as a factory or decorator. When given an argument, it extends an object with emitter functionality, otherwise it returns a new object that implements the same API. This eliminates the possibility that the private _callbacks member of Heartbeat was overridden. It also reduces the use of classical inheritance, which yields some minor file size benefits by polyfilling less of the class API.

Version 2.0.1

• Fix issue where empty arguments would break deserialize

Version 2.0.0

• Replace default Microcosm::send currying with partial application using Microcosm::prepare
• Throw an error if a store is added that does not have a unique identifier
• Microcosm::set has been replaced with Microcosm::merge, so far set has only been used internally to Microcosm and merge dries a couple of things up

More info on removing currying

Currying has been removed Microcosm::send. This was overly clever and somewhat malicious. If an action has default arguments, JavaScript has no way (to my knowledge) of communicating it. One (me) could get into a situation where it is unclear why an action has not fired properly (insufficient arguments when expecting fallback defaults).

In a language without static typing, this can be particularly hard to debug.

In most cases, partial application is sufficient. In light of this, actions can be "buffered up" up with Microcosm::prepare:

// Old
let curried = app.send(Action)

// New
let partial = app.prepare(Action)

Microcosm::prepare is basically just fn.bind() under the hood. Actions should not use context whatsoever, so this should be a reasonable caveat.

Version 1.4.0

• Store.deserialize returns the result of getInitialState if no state is given
• Added Microcosm.swap to perform diffing and emission on change
• Microcosm.seed will now trigger a change event
• Heartbeat.js now invokes callbacks with callback.call(this)

Version 1.3.0

• Microcosms will set the result of getInitialState when adding a store
• Microcosms will execute deserialize on stores when running seed
• Adding a store will now fold its properties on top of a default set of options. See ./src/Store.js for details.

Version 1.2.1

• Fix bug introduced with Tag by exposing ES6 module

Version 1.2.0

• All stores can implement a serialize method which allows them to shape how app state is serialized to JSON.

Version 1.1.0

• Better seeding. Added Microcosm::seed which accepts an object. For each known key, Microcosm will the associated store's getInitialState function and set the returned value.
• Exposed Microcosm::getInitialState to configure the starting value of the instance. This is useful for those wishing to use the immutable npm package by Facebook.
• Microcosm will not emit changes on dispatch unless the new state fails a shallow equality check. This can be configured with Microcosm::shouldUpdate
• Microcosm::send is now curried.