Watcher

It allows you to observe a STORE.
You can intercept when the STORE performs an action or a mutator.

addWatch

Inserts a WATCHER into JON

addWatch( watcher:Watcher )

• watcher

removeWatch

Removes a listener from JON
if actionName is null delete all listener of STORE
if callback is null delete all listener of actionName

removeWatch( watcher:Watcher )

• watcher

---

Watcher

Identifies a callback called when a specific STORE action/mutator is executed

interface Watcher {
    store: Store,
    actionName: string,
    callback: WatchCallback,
}

• store
  STORE instance to be observed
• actionName
  name of the 'action' or 'mutator' to be observed
• callback
  Function executed when 'action' or 'mutator' are called (msg: WatchMsg) => void

WatchMsg

Data of an event that occurred in a STORE.

interface WatchMsg {
    type: EVENTS_TYPES,
    store: Store,
    key: string,
    payload: any,
    result: any,
    subcall: boolean
}

• type
  Type of event, may be: mutator, action
• store
  STORE instance that generated this event
• key
  Name of the action or mutator that generated this event
• payload
  Parameters sent to the action or mutator
• result
  Value returned by action
• subcall
  true if it is a call from another action