diff --git a/src/reconcile.ts b/src/reconcile.ts
index 7102ff2c..52d5babe 100644
--- a/src/reconcile.ts
+++ b/src/reconcile.ts
@@ -2,7 +2,6 @@ import {
   IFiber,
   FreElement,
   FC,
-  Attributes,
   HTMLElementEx,
   FreNode,
   HookEffect,
@@ -23,10 +22,10 @@ export const enum TAG {
   SVG = 1 << 4,
   DIRTY = 1 << 5,
   MOVE = 1 << 6,
-  REPLACE = 1 << 7
+  REPLACE = 1 << 7,
 }
 
-export const render = (vnode: FreElement, node: Node): void => {
+export const render = (vnode: FreElement, node: Node) => {
   rootFiber = {
     node,
     props: { children: vnode },
@@ -41,23 +40,24 @@ export const update = (fiber?: IFiber) => {
   }
 }
 
-const reconcile = (fiber?: IFiber): boolean => {
+const reconcile = (fiber?: IFiber) => {
   while (fiber && !shouldYield()) fiber = capture(fiber)
-  if (fiber) return reconcile.bind(null, fiber)
+  if (fiber) return reconcile.bind(null, fiber) as typeof reconcile
   return null
 }
 
-const memo = (fiber) => {
+const memo = (fiber: IFiber) => {
   if ((fiber.type as FC).memo && fiber.old?.props) {
     let scu = (fiber.type as FC).shouldUpdate || shouldUpdate
-    if (!scu(fiber.props, fiber.old.props)) { // fast-fix
+    if (!scu(fiber.props, fiber.old.props)) {
+      // fast-fix
       return getSibling(fiber)
     }
   }
   return null
 }
 
-const capture = (fiber: IFiber): IFiber | undefined => {
+const capture = (fiber: IFiber) => {
   fiber.isComp = isFn(fiber.type)
   if (fiber.isComp) {
     const memoFiber = memo(fiber)
@@ -73,7 +73,7 @@ const capture = (fiber: IFiber): IFiber | undefined => {
   return sibling
 }
 
-const getSibling = (fiber) => {
+const getSibling = (fiber?: IFiber) => {
   while (fiber) {
     bubble(fiber)
     if (fiber.dirty) {
@@ -87,7 +87,7 @@ const getSibling = (fiber) => {
   return null
 }
 
-const bubble = fiber => {
+const bubble = (fiber: IFiber) => {
   if (fiber.isComp) {
     if (fiber.hooks) {
       side(fiber.hooks.layout)
@@ -96,24 +96,26 @@ const bubble = fiber => {
   }
 }
 
-
-const shouldUpdate = (a, b) => {
+const shouldUpdate = (
+  a: Record<string, unknown>,
+  b: Record<string, unknown>
+) => {
   for (let i in a) if (!(i in b)) return true
   for (let i in b) if (a[i] !== b[i]) return true
 }
 
-const updateHook = <P = Attributes>(fiber: IFiber): any => {
+const updateHook = (fiber: IFiber) => {
   resetCursor()
   currentFiber = fiber
-  let children = (fiber.type as FC<P>)(fiber.props)
+  let children = (fiber.type as FC)(fiber.props)
   reconcileChidren(fiber, simpleVnode(children))
 }
 
-const updateHost = (fiber: IFiber): void => {
-  fiber.parentNode = (getParentNode(fiber) as any) || {}
+const updateHost = (fiber: IFiber) => {
+  fiber.parentNode = getParentNode(fiber) || {}
   if (!fiber.node) {
     if (fiber.type === 'svg') fiber.lane |= TAG.SVG
-    fiber.node = createElement(fiber) as HTMLElementEx
+    fiber.node = createElement(fiber)
   }
   reconcileChidren(fiber, fiber.props.children)
 }
@@ -121,15 +123,15 @@ const updateHost = (fiber: IFiber): void => {
 const simpleVnode = (type: any) =>
   isStr(type) ? createText(type as string) : type
 
-const getParentNode = (fiber: IFiber): HTMLElement | undefined => {
+const getParentNode = (fiber: IFiber) => {
   while ((fiber = fiber.parent)) {
     if (!fiber.isComp) return fiber.node
   }
 }
 
-const reconcileChidren = (fiber: any, children: FreNode): void => {
+const reconcileChidren = (fiber: IFiber, children: FreNode) => {
   let aCh = fiber.kids || [],
-    bCh = (fiber.kids = arrayfy(children) as any)
+    bCh = (fiber.kids = arrayfy(children))
   const actions = diff(aCh, bCh)
 
   for (let i = 0, prev = null, len = bCh.length; i < len; i++) {
@@ -156,11 +158,11 @@ function clone(a, b) {
   b.old = a
 }
 
-export const arrayfy = arr => (!arr ? [] : isArr(arr) ? arr : [arr])
+export const arrayfy = (arr: unknown) => (!arr ? [] : isArr(arr) ? arr : [arr])
 
-const side = (effects: HookEffect[]): void => {
-  effects.forEach(e => e[2] && e[2]())
-  effects.forEach(e => (e[2] = e[0]()))
+const side = (effects: HookEffect[]) => {
+  effects.forEach((e) => e[2] && e[2]())
+  effects.forEach((e) => (e[2] = e[0]()))
   effects.length = 0
 }
 
@@ -168,34 +170,37 @@ const diff = function (a, b) {
   var actions = [],
     aIdx = {},
     bIdx = {},
-    key = v => v.key + v.type,
-    i, j;
+    key = (v) => v.key + v.type,
+    i,
+    j
   for (i = 0; i < a.length; i++) {
-    aIdx[key(a[i])] = i;
+    aIdx[key(a[i])] = i
   }
   for (i = 0; i < b.length; i++) {
-    bIdx[key(b[i])] = i;
+    bIdx[key(b[i])] = i
   }
-  for (i = j = 0; i !== a.length || j !== b.length;) {
-    var aElm = a[i], bElm = b[j];
+  for (i = j = 0; i !== a.length || j !== b.length; ) {
+    var aElm = a[i],
+      bElm = b[j]
     if (aElm === null) {
-      i++;
+      i++
     } else if (b.length <= j) {
       removeElement(a[i])
-      i++;
+      i++
     } else if (a.length <= i) {
       actions.push({ op: TAG.INSERT, elm: bElm, before: a[i] })
-      j++;
+      j++
     } else if (key(aElm) === key(bElm)) {
       clone(aElm, bElm)
       actions.push({ op: TAG.UPDATE })
-      i++; j++;
+      i++
+      j++
     } else {
       var curElmInNew = bIdx[key(aElm)]
       var wantedElmInOld = aIdx[key(bElm)]
       if (curElmInNew === undefined) {
         removeElement(a[i])
-        i++;
+        i++
       } else if (wantedElmInOld === undefined) {
         actions.push({ op: TAG.INSERT, elm: bElm, before: a[i] })
         j++
@@ -211,6 +216,6 @@ const diff = function (a, b) {
 }
 
 export const getCurrentFiber = () => currentFiber || null
-export const isFn = (x: any): x is Function => typeof x === 'function'
-export const isStr = (s: any): s is number | string =>
-  typeof s === 'number' || typeof s === 'string'
\ No newline at end of file
+export const isFn = (x: unknown): x is Function => typeof x === 'function'
+export const isStr = (s: unknown): s is number | string =>
+  typeof s === 'number' || typeof s === 'string'
diff --git a/src/type.ts b/src/type.ts
index c900e4c0..7a3e3c36 100644
--- a/src/type.ts
+++ b/src/type.ts
@@ -28,8 +28,6 @@ export interface FreElement<P extends Attributes = any, T = string> {
   key: string
 }
 
-export type HookTypes = 'list' | 'effect' | 'layout'
-
 export interface Hooks {
   list: HookList[]
   layout: HookEffect[]
@@ -47,7 +45,7 @@ export type HookReducer<V = any, A = any> = [value: V, dispatch: Dispatch<A>]
 export interface IFiber<P extends Attributes = any> {
   key?: string
   type: string | FC<P>
-  parentNode: HTMLElementEx
+  parentNode: HTMLElementEx | {}
   node: HTMLElementEx
   kids?: any
   dirty: boolean
@@ -55,6 +53,7 @@ export interface IFiber<P extends Attributes = any> {
   sibling?: IFiber<P>
   child?: IFiber<P>
   ref?: Ref<HTMLElement | undefined>
+  old?: IFiber
   hooks?: Hooks
   action: any
   props: P
@@ -62,7 +61,7 @@ export interface IFiber<P extends Attributes = any> {
   isComp: boolean
 }
 
-export type HTMLElementEx = HTMLElement & { last: IFiber | null }
+export type HTMLElementEx = HTMLElement | Text | SVGElement
 
 export type FreText = string | number
 export type FreNode =