diff --git a/src/components/FileExplorer.tsx b/src/components/FileExplorer.tsx
index 1bbb612..418e766 100644
--- a/src/components/FileExplorer.tsx
+++ b/src/components/FileExplorer.tsx
@@ -31,9 +31,9 @@ class FileExplorer extends React.Component<Props & ConnectorState> {
   }
 
   componentWillMount() {
-    const { init, setUpTree, treeData } = this.props
+    const { init, setUpTree, treeData, metaData, compressSingletonFolder, accessToken } = this.props
     init()
-    setUpTree(treeData)
+    setUpTree({ treeData, metaData, compressSingletonFolder, accessToken })
   }
 
   componentDidMount() {
@@ -43,8 +43,8 @@ class FileExplorer extends React.Component<Props & ConnectorState> {
 
   componentWillReceiveProps(nextProps: Props & ConnectorState) {
     if (nextProps.treeData !== this.props.treeData) {
-      const { setUpTree } = nextProps
-      setUpTree()
+      const { setUpTree, treeData, metaData, compressSingletonFolder, accessToken } = nextProps
+      setUpTree({ treeData, metaData, compressSingletonFolder, accessToken })
     }
   }
 
diff --git a/src/driver/connect.ts b/src/driver/connect.ts
index 880dbca..b80b27b 100644
--- a/src/driver/connect.ts
+++ b/src/driver/connect.ts
@@ -34,10 +34,7 @@ function run<M extends Method>([method, args]: [M, Parameters<M>]) {
 }
 
 export type DispatchState<Props, State> = React.Component<Props, State>['setState']
-export type PreDispatch<Props, State> = (
-  dispatchCallback: (state: State, props: Props) => Props | Promise<void> | void,
-  callback?: () => void,
-) => void
+export type GetState<State> = () => State
 export type TriggerOtherMethod<Props, State> = <Args, MC extends MethodCreator<Props, State, Args>>(
   methodCreator: MC,
   ...args: Parameters<ReturnType<MC>>
@@ -45,7 +42,7 @@ export type TriggerOtherMethod<Props, State> = <Args, MC extends MethodCreator<P
 
 export type Dispatch<Props, State> = {
   set: DispatchState<Props, State>
-  get: PreDispatch<Props, State>
+  get: GetState<State>
   call: TriggerOtherMethod<Props, State>
 }
 
@@ -81,13 +78,7 @@ function link<P, S>(instance: React.Component<P, S>, sources: Sources<P, S>): Wr
   const dispatchState: DispatchState<P, S> = (updater, callback) => {
     instance.setState(updater, callback)
   }
-  const prepareState: PreDispatch<P, S> = async updater => {
-    try {
-      await updater(instance.state, instance.props)
-    } catch (error) {
-      raiseError(error)
-    }
-  }
+  const prepareState: GetState<S> = () => instance.state
   const dispatch: Dispatch<P, S> = {
     call: dispatchCall,
     get: prepareState,
@@ -124,8 +115,3 @@ export default function connect<BaseP, ExtraP>(mapping: Sources<BaseP, ExtraP>)
   }
 }
 
-export function promisifyGetState<Props, State>(
-  get: PreDispatch<Props, State>,
-): () => Promise<State> {
-  return () => new Promise(resolve => get(state => resolve(state)))
-}
diff --git a/src/driver/core/FileExplorer.ts b/src/driver/core/FileExplorer.ts
index 09e7ef5..b6f940c 100644
--- a/src/driver/core/FileExplorer.ts
+++ b/src/driver/core/FileExplorer.ts
@@ -125,8 +125,11 @@ function handleParsed(root: TreeNode, parsed: Parsed) {
   })
 }
 
-const setUpTree: MethodCreator<Props, ConnectorState> = dispatch => () =>
-  dispatch.get(async (_, { treeData, metaData, compressSingletonFolder, accessToken }) => {
+const setUpTree: MethodCreator<
+  Props,
+  ConnectorState,
+  [Pick<Props, 'treeData' | 'metaData' | 'compressSingletonFolder' | 'accessToken'>]
+> = dispatch => async ({ treeData, metaData, compressSingletonFolder, accessToken }) => {
     if (!treeData) return
     dispatch.call(setStateText, 'Rendering File List...')
     const { root, gitModules } = treeParser.parse(treeData, metaData)
@@ -153,7 +156,7 @@ const setUpTree: MethodCreator<Props, ConnectorState> = dispatch => () =>
     tasksAfterRender.push(DOMHelper.focusSearchInput)
     dispatch.call(setStateText, '')
     dispatch.call(goTo, URLHelper.getCurrentPath(metaData.branchName))
-  })
+}
 
 const execAfterRender: MethodCreator<Props, ConnectorState> = dispatch => () => {
   for (const task of tasksAfterRender) {
@@ -175,8 +178,8 @@ const handleKeyDown: MethodCreator<
   Props,
   ConnectorState,
   [React.KeyboardEvent]
-> = dispatch => event =>
-  dispatch.get(({ searched, visibleNodes }) => {
+> = dispatch => event => {
+  const { searched, visibleNodes } = dispatch.get()
     if (!visibleNodes) return
     const { nodes, focusedNode, expandedNodes, depths } = visibleNodes
     function handleVerticalMove(index: number) {
@@ -278,7 +281,7 @@ const handleKeyDown: MethodCreator<
         }
       }
     }
-  })
+}
 
 const onFocusSearchBar: MethodCreator<Props, ConnectorState> = dispatch => () =>
   dispatch.call(focusNode, null, false)
@@ -337,12 +340,12 @@ const toggleNodeExpansion: MethodCreator<Props, ConnectorState, [TreeNode, boole
 const focusNode: MethodCreator<Props, ConnectorState, [TreeNode | null, boolean]> = dispatch => (
   node: TreeNode | null,
   skipScroll = false,
-) =>
-  dispatch.get(({ visibleNodes }) => {
+) => {
+  const { visibleNodes } = dispatch.get()
     if (!visibleNodes) return
     visibleNodesGenerator.focusNode(node)
     dispatch.call(updateVisibleNodes)
-  })
+}
 
 const onNodeClick: MethodCreator<Props, ConnectorState, [TreeNode]> = dispatch => node => {
   if (node.type === 'tree') {
diff --git a/src/driver/core/SideBar.ts b/src/driver/core/SideBar.ts
index cba88d4..66c4adf 100644
--- a/src/driver/core/SideBar.ts
+++ b/src/driver/core/SideBar.ts
@@ -56,7 +56,7 @@ export type ConnectorState = {
 }
 
 const init: MethodCreator<Props, ConnectorState> = dispatch => async () => {
-  const { initializingPromise } = await promisifyGetState(dispatch.get)()
+  const { initializingPromise } = dispatch.get()
   if (initializingPromise) await initializingPromise
 
   let done: any = null // cannot use type `(() => void) | null` here
@@ -178,28 +178,26 @@ const handleError: MethodCreator<Props, ConnectorState, [Error]> = dispatch => a
 }
 
 const onPJAXEnd: MethodCreator<Props, ConnectorState> = dispatch => () => {
-  dispatch.get(({ metaData, copyFileButton, copySnippetButton }) => {
+  const { metaData, copyFileButton, copySnippetButton } = dispatch.get()
     DOMHelper.unmountTopProgressBar()
     DOMHelper.decorateGitHubPageContent({ copyFileButton, copySnippetButton })
     const mergedMetaData = { ...metaData, ...URLHelper.parse() }
     dispatch.call(setShouldShow, URLHelper.isInCodePage(mergedMetaData))
     dispatch.call(setMetaData, mergedMetaData)
-  })
 }
 
 const onKeyDown: MethodCreator<Props, ConnectorState, [KeyboardEvent]> = dispatch => e => {
-  dispatch.get(({ toggleShowSideBarShortcut }) => {
+  const { toggleShowSideBarShortcut } = dispatch.get()
     if (toggleShowSideBarShortcut) {
       const keys = keyHelper.parseEvent(e)
       if (keys === toggleShowSideBarShortcut) {
         dispatch.call(toggleShowSideBar)
       }
     }
-  })
 }
 
 const toggleShowSideBar: MethodCreator<Props, ConnectorState> = dispatch => () =>
-  dispatch.get(({ shouldShow }) => dispatch.call(setShouldShow, !shouldShow))
+  dispatch.call(setShouldShow, !dispatch.get().shouldShow)
 
 const setShouldShow: MethodCreator<
   Props,
@@ -276,7 +274,7 @@ const useListeners: MethodCreator<Props, ConnectorState, [boolean]> = dispatch =
   const $onPJAXEnd = dispatch.call.bind(dispatch, onPJAXEnd)
   const $onKeyDown = dispatch.call.bind(dispatch, onKeyDown)
   return on => {
-    dispatch.get(({ disabled }, _) => {
+    const { disabled } = dispatch.get()
       if (on && !disabled) {
         window.addEventListener('pjax:complete', $onPJAXEnd)
         window.addEventListener('keydown', $onKeyDown)
@@ -284,7 +282,6 @@ const useListeners: MethodCreator<Props, ConnectorState, [boolean]> = dispatch =
         window.removeEventListener('pjax:complete', $onPJAXEnd)
         window.removeEventListener('keydown', $onKeyDown)
       }
-    })
   }
 }