TypeScript mobx-state-tree.getSnapshot函数代码示例

test("responds with current state", t => {
  const { track, plugin } = createMstPlugin()
  const user = TestUserModel.create()
  track(user)
  plugin.onCommand(INBOUND)
  t.deepEqual(STATE, getSnapshot(user))
})

    // --- Reactotron Hooks ---------------------------------

    /**
     * A backup of state has been requested. Lets serialize the current
     * state and send it up to the app.
     *
     * @param command A reactotron command.
     */
    function backup(command: any) {
      const trackedNode = trackedNodes[command.mstNodeName || "default"]
      if (trackedNode && trackedNode.node) {
        const state = getSnapshot(trackedNode.node)
        reactotron.send("state.backup.response", { state })
      }
    }

 action => {
     if (applyingSnapshot) return
     const copy: any = {}
     copy.type = action.name
     if (action.args) action.args.forEach((value, index) => (copy[index] = value))
     remotedev.send(copy, mst.getSnapshot(model))
 },

 /**
  * Subscribes to some paths in state. Allows the user to track a subset of
  * data within the state that will be sent to them every time it changes.
  *
  * @param command The command received from the reactotron app.
  */
 function subscribe(command: any) {
   const trackedNode = trackedNodes[command.mstNodeName || "default"]
   const paths: string[] = (command && command.payload && command.payload.paths) || []
   if (trackedNode && trackedNode.node && paths) {
     subscriptions = uniq(flatten(paths))
     const state = getSnapshot(trackedNode.node)
     sendSubscriptions(state)
   }
 }

export const connectReduxDevtools = function connectReduxDevtools(remoteDevDep: any, model: any) {
    // Connect to the monitor
    const remotedev = remoteDevDep.connectViaExtension({ name: mst.getType(model).name })
    let applyingSnapshot = false

    // Subscribe to change state (if need more than just logging)
    remotedev.subscribe((message: any) => {
        if (message.type === "DISPATCH") {
            handleMonitorActions(remotedev, model, message)
        }
    })

    const initialState = mst.getSnapshot(model)
    remotedev.init(initialState)

    // Send changes to the remote monitor
    mst.onAction(
        model,
        action => {
            if (applyingSnapshot) return
            const copy: any = {}
            copy.type = action.name
            if (action.args) action.args.forEach((value, index) => (copy[index] = value))
            remotedev.send(copy, mst.getSnapshot(model))
        },
        true
    )

    function handleMonitorActions(remotedev: any, model: any, message: any) {
        switch (message.payload.type) {
            case "RESET":
                applySnapshot(model, initialState)
                return remotedev.init(initialState)
            case "COMMIT":
                return remotedev.init(mst.getSnapshot(model))
            case "ROLLBACK":
                return remotedev.init(remoteDevDep.extractState(message))
            case "JUMP_TO_STATE":
            case "JUMP_TO_ACTION":
                applySnapshot(model, remoteDevDep.extractState(message))
                return
            case "IMPORT_STATE":
                const nextLiftedState = message.payload.nextLiftedState
                const computedStates = nextLiftedState.computedStates
                applySnapshot(model, computedStates[computedStates.length - 1].state)
                remotedev.send(null, nextLiftedState)
                return
            default:
        }
    }

    function applySnapshot(model: any, state: any) {
        applyingSnapshot = true
        mst.applySnapshot(model, state)
        applyingSnapshot = false
    }
}

 /**
  * Gets the current value located at the path within the state tree.
  *
  * @param command The command received from the reactotron app.
  */
 function requestValues(command: any) {
   const trackedNode = trackedNodes[command.mstNodeName || "default"]
   const atPath: string = (command && command.payload && command.payload.path) || []
   if (trackedNode && trackedNode.node && atPath) {
     const state = getSnapshot(trackedNode.node)
     if (isNilOrEmpty(atPath)) {
       reactotron.stateValuesResponse(null, state)
     } else {
       reactotron.stateValuesResponse(atPath, dotPath(atPath, state))
     }
   }
 }

    .actions(self => {
        let targetStore: any
        let snapshotDisposer: any
        let skipNextUndoState = false

        return {
            addUndoState(todos: any) {
                if (skipNextUndoState) {
                    // skip recording if this state was caused by undo / redo
                    skipNextUndoState = false
                    return
                }
                self.history.splice(self.undoIdx + 1)
                self.history.push(todos)
                self.undoIdx = self.history.length - 1
            },
            afterCreate() {
                targetStore = self.targetPath
                    ? resolvePath(self, self.targetPath)
                    : getEnv(self).targetStore
                if (!targetStore)
                    throw new Error(
                        "Failed to find target store for TimeTraveller. Please provide `targetPath`  property, or a `targetStore` in the environment"
                    )
                // TODO: check if targetStore doesn't contain self
                // if (contains(targetStore, self)) throw new Error("TimeTraveller shouldn't be recording itself. Please specify a sibling as taret, not some parent")
                // start listening to changes
                snapshotDisposer = onSnapshot(targetStore, snapshot =>
                    (self as any).addUndoState(snapshot)
                )
                // record an initial state if no known
                if (self.history.length === 0) (self as any).addUndoState(getSnapshot(targetStore))
            },
            beforeDestroy() {
                snapshotDisposer()
            },
            undo() {
                self.undoIdx--
                skipNextUndoState = true
                applySnapshot(targetStore, self.history[self.undoIdx])
            },
            redo() {
                self.undoIdx++
                skipNextUndoState = true
                applySnapshot(targetStore, self.history[self.undoIdx])
            }
        }
    })

 function handleMonitorActions(remotedev: any, model: any, message: any) {
     switch (message.payload.type) {
         case "RESET":
             applySnapshot(model, initialState)
             return remotedev.init(initialState)
         case "COMMIT":
             return remotedev.init(mst.getSnapshot(model))
         case "ROLLBACK":
             return remotedev.init(remoteDevDep.extractState(message))
         case "JUMP_TO_STATE":
         case "JUMP_TO_ACTION":
             applySnapshot(model, remoteDevDep.extractState(message))
             return
         case "IMPORT_STATE":
             const nextLiftedState = message.payload.nextLiftedState
             const computedStates = nextLiftedState.computedStates
             applySnapshot(model, computedStates[computedStates.length - 1].state)
             remotedev.send(null, nextLiftedState)
             return
         default:
     }
 }