Types src/content

33 files changed, 605 insertions, 287 deletions

diff --git a/src/content/MessageListener.ts b/src/content/MessageListener.ts
new file mode 100644
index 0000000..105d028
--- /dev/null
+++ b/src/content/MessageListener.ts
@@ -0,0 +1,32 @@
+import { Message, valueOf } from '../shared/messages';
+
+export type WebMessageSender = Window | MessagePort | ServiceWorker | null;
+export type WebExtMessageSender = browser.runtime.MessageSender;
+
+export default class MessageListener {
+  onWebMessage(
+    listener: (msg: Message, sender: WebMessageSender) => void,
+  ) {
+    window.addEventListener('message', (event: MessageEvent) => {
+      let sender = event.source;
+      let message = null;
+      try {
+        message = JSON.parse(event.data);
+      } catch (e) {
+        // ignore unexpected message
+        return;
+      }
+      listener(message, sender);
+    });
+  }
+
+  onBackgroundMessage(
+    listener: (msg: Message, sender: WebExtMessageSender) => any,
+  ) {
+    browser.runtime.onMessage.addListener(
+      (msg: any, sender: WebExtMessageSender) => {
+        listener(valueOf(msg), sender);
+      },
+    );
+  }
+}
diff --git a/src/content/actions/addon.ts b/src/content/actions/addon.ts
index b30cf16..8dedae0 100644
--- a/src/content/actions/addon.ts
+++ b/src/content/actions/addon.ts
@@ -1,11 +1,11 @@
-import messages from 'shared/messages';
-import actions from 'content/actions';
+import * as messages from '../../shared/messages';
+import * as actions from './index';
 
-const enable = () => setEnabled(true);
+const enable = (): Promise<actions.AddonAction> => setEnabled(true);
 
-const disable = () => setEnabled(false);
+const disable = (): Promise<actions.AddonAction> => setEnabled(false);
 
-const setEnabled = async(enabled) => {
+const setEnabled = async(enabled: boolean): Promise<actions.AddonAction> => {
   await browser.runtime.sendMessage({
     type: messages.ADDON_ENABLED_RESPONSE,
     enabled,
diff --git a/src/content/actions/find.ts b/src/content/actions/find.ts
index e08d7e5..6dd2ae6 100644
--- a/src/content/actions/find.ts
+++ b/src/content/actions/find.ts
@@ -5,28 +5,41 @@
 // NOTE: window.find is not standard API
 // https://developer.mozilla.org/en-US/docs/Web/API/Window/find
 
-import messages from 'shared/messages';
-import actions from 'content/actions';
+import * as messages from '../../shared/messages';
+import * as actions from './index';
 import * as consoleFrames from '../console-frames';
 
-const find = (string, backwards) => {
+const find = (str: string, backwards: boolean): boolean => {
   let caseSensitive = false;
   let wrapScan = true;
 
 
   // NOTE: aWholeWord dows not implemented, and aSearchInFrames does not work
   // because of same origin policy
-  let found = window.find(string, caseSensitive, backwards, wrapScan);
+
+  // eslint-disable-next-line no-extra-parens
+  let found = (<any>window).find(str, caseSensitive, backwards, wrapScan);
   if (found) {
     return found;
   }
-  window.getSelection().removeAllRanges();
-  return window.find(string, caseSensitive, backwards, wrapScan);
+  let sel = window.getSelection();
+  if (sel) {
+    sel.removeAllRanges();
+  }
+
+  // eslint-disable-next-line no-extra-parens
+  return (<any>window).find(str, caseSensitive, backwards, wrapScan);
 };
 
-const findNext = async(currentKeyword, reset, backwards) => {
+// eslint-disable-next-line max-statements
+const findNext = async(
+  currentKeyword: string, reset: boolean, backwards: boolean,
+): Promise<actions.FindAction> => {
   if (reset) {
-    window.getSelection().removeAllRanges();
+    let sel = window.getSelection();
+    if (sel) {
+      sel.removeAllRanges();
+    }
   }
 
   let keyword = currentKeyword;
@@ -41,7 +54,8 @@ const findNext = async(currentKeyword, reset, backwards) => {
     });
   }
   if (!keyword) {
-    return consoleFrames.postError('No previous search keywords');
+    await consoleFrames.postError('No previous search keywords');
+    return { type: actions.NOOP };
   }
   let found = find(keyword, backwards);
   if (found) {
@@ -57,11 +71,15 @@ const findNext = async(currentKeyword, reset, backwards) => {
   };
 };
 
-const next = (currentKeyword, reset) => {
+const next = (
+  currentKeyword: string, reset: boolean,
+): Promise<actions.FindAction> => {
   return findNext(currentKeyword, reset, false);
 };
 
-const prev = (currentKeyword, reset) => {
+const prev = (
+  currentKeyword: string, reset: boolean,
+): Promise<actions.FindAction> => {
   return findNext(currentKeyword, reset, true);
 };
 
diff --git a/src/content/actions/follow-controller.ts b/src/content/actions/follow-controller.ts
index 006b248..115b3b6 100644
--- a/src/content/actions/follow-controller.ts
+++ b/src/content/actions/follow-controller.ts
@@ -1,6 +1,8 @@
-import actions from 'content/actions';
+import * as actions from './index';
 
-const enable = (newTab, background) => {
+const enable = (
+  newTab: boolean, background: boolean,
+): actions.FollowAction => {
   return {
     type: actions.FOLLOW_CONTROLLER_ENABLE,
     newTab,
@@ -8,20 +10,20 @@ const enable = (newTab, background) => {
   };
 };
 
-const disable = () => {
+const disable = (): actions.FollowAction => {
   return {
     type: actions.FOLLOW_CONTROLLER_DISABLE,
   };
 };
 
-const keyPress = (key) => {
+const keyPress = (key: string): actions.FollowAction => {
   return {
     type: actions.FOLLOW_CONTROLLER_KEY_PRESS,
     key: key
   };
 };
 
-const backspace = () => {
+const backspace = (): actions.FollowAction => {
   return {
     type: actions.FOLLOW_CONTROLLER_BACKSPACE,
   };
diff --git a/src/content/actions/index.ts b/src/content/actions/index.ts
index 0a16fdf..18d0a69 100644
--- a/src/content/actions/index.ts
+++ b/src/content/actions/index.ts
@@ -1,31 +1,120 @@
-export default {
-  // Enable/disable
-  ADDON_SET_ENABLED: 'addon.set.enabled',
-
-  // Settings
-  SETTING_SET: 'setting.set',
-
-  // User input
-  INPUT_KEY_PRESS: 'input.key.press',
-  INPUT_CLEAR_KEYS: 'input.clear.keys',
-
-  // Completion
-  COMPLETION_SET_ITEMS: 'completion.set.items',
-  COMPLETION_SELECT_NEXT: 'completions.select.next',
-  COMPLETION_SELECT_PREV: 'completions.select.prev',
-
-  // Follow
-  FOLLOW_CONTROLLER_ENABLE: 'follow.controller.enable',
-  FOLLOW_CONTROLLER_DISABLE: 'follow.controller.disable',
-  FOLLOW_CONTROLLER_KEY_PRESS: 'follow.controller.key.press',
-  FOLLOW_CONTROLLER_BACKSPACE: 'follow.controller.backspace',
-
-  // Find
-  FIND_SET_KEYWORD: 'find.set.keyword',
-
-  // Mark
-  MARK_START_SET: 'mark.start.set',
-  MARK_START_JUMP: 'mark.start.jump',
-  MARK_CANCEL: 'mark.cancel',
-  MARK_SET_LOCAL: 'mark.set.local',
-};
+import Redux from 'redux';
+
+// Enable/disable
+export const ADDON_SET_ENABLED = 'addon.set.enabled';
+
+// Find
+export const FIND_SET_KEYWORD = 'find.set.keyword';
+
+// Settings
+export const SETTING_SET = 'setting.set';
+
+// User input
+export const INPUT_KEY_PRESS = 'input.key.press';
+export const INPUT_CLEAR_KEYS = 'input.clear.keys';
+
+// Completion
+export const COMPLETION_SET_ITEMS = 'completion.set.items';
+export const COMPLETION_SELECT_NEXT = 'completions.select.next';
+export const COMPLETION_SELECT_PREV = 'completions.select.prev';
+
+// Follow
+export const FOLLOW_CONTROLLER_ENABLE = 'follow.controller.enable';
+export const FOLLOW_CONTROLLER_DISABLE = 'follow.controller.disable';
+export const FOLLOW_CONTROLLER_KEY_PRESS = 'follow.controller.key.press';
+export const FOLLOW_CONTROLLER_BACKSPACE = 'follow.controller.backspace';
+
+// Mark
+export const MARK_START_SET = 'mark.start.set';
+export const MARK_START_JUMP = 'mark.start.jump';
+export const MARK_CANCEL = 'mark.cancel';
+export const MARK_SET_LOCAL = 'mark.set.local';
+
+export const NOOP = 'noop';
+
+export interface AddonSetEnabledAction extends Redux.Action {
+  type: typeof ADDON_SET_ENABLED;
+  enabled: boolean;
+}
+
+export interface FindSetKeywordAction extends Redux.Action {
+  type: typeof FIND_SET_KEYWORD;
+  keyword: string;
+  found: boolean;
+}
+
+export interface SettingSetAction extends Redux.Action {
+  type: typeof SETTING_SET;
+  value: any;
+}
+
+export interface InputKeyPressAction extends Redux.Action {
+  type: typeof INPUT_KEY_PRESS;
+  key: string;
+}
+
+export interface InputClearKeysAction extends Redux.Action {
+  type: typeof INPUT_CLEAR_KEYS;
+}
+
+export interface FollowControllerEnableAction extends Redux.Action {
+  type: typeof FOLLOW_CONTROLLER_ENABLE;
+  newTab: boolean;
+  background: boolean;
+}
+
+export interface FollowControllerDisableAction extends Redux.Action {
+  type: typeof FOLLOW_CONTROLLER_DISABLE;
+}
+
+export interface FollowControllerKeyPressAction extends Redux.Action {
+  type: typeof FOLLOW_CONTROLLER_KEY_PRESS;
+  key: string;
+}
+
+export interface FollowControllerBackspaceAction extends Redux.Action {
+  type: typeof FOLLOW_CONTROLLER_BACKSPACE;
+}
+
+export interface MarkStartSetAction extends Redux.Action {
+  type: typeof MARK_START_SET;
+}
+
+export interface MarkStartJumpAction extends Redux.Action {
+  type: typeof MARK_START_JUMP;
+}
+
+export interface MarkCancelAction extends Redux.Action {
+  type: typeof MARK_CANCEL;
+}
+
+export interface MarkSetLocalAction extends Redux.Action {
+  type: typeof MARK_SET_LOCAL;
+  key: string;
+  x: number;
+  y: number;
+}
+
+export interface NoopAction extends Redux.Action {
+  type: typeof NOOP;
+}
+
+export type AddonAction = AddonSetEnabledAction;
+export type FindAction = FindSetKeywordAction | NoopAction;
+export type SettingAction = SettingSetAction;
+export type InputAction = InputKeyPressAction | InputClearKeysAction;
+export type FollowAction =
+  FollowControllerEnableAction | FollowControllerDisableAction |
+  FollowControllerKeyPressAction | FollowControllerBackspaceAction;
+export type MarkAction =
+  MarkStartSetAction | MarkStartJumpAction |
+  MarkCancelAction | MarkSetLocalAction | NoopAction;
+
+export type Action =
+  AddonAction |
+  FindAction |
+  SettingAction |
+  InputAction |
+  FollowAction |
+  MarkAction |
+  NoopAction;
diff --git a/src/content/actions/input.ts b/src/content/actions/input.ts
index 465a486..21c912e 100644
--- a/src/content/actions/input.ts
+++ b/src/content/actions/input.ts
@@ -1,13 +1,13 @@
-import actions from 'content/actions';
+import * as actions from './index';
 
-const keyPress = (key) => {
+const keyPress = (key: string): actions.InputAction => {
   return {
     type: actions.INPUT_KEY_PRESS,
     key,
   };
 };
 
-const clearKeys = () => {
+const clearKeys = (): actions.InputAction => {
   return {
     type: actions.INPUT_CLEAR_KEYS
   };
diff --git a/src/content/actions/mark.ts b/src/content/actions/mark.ts
index 712a811..5eb9554 100644
--- a/src/content/actions/mark.ts
+++ b/src/content/actions/mark.ts
@@ -1,19 +1,19 @@
-import actions from 'content/actions';
-import messages from 'shared/messages';
+import * as actions from './index';
+import * as messages from '../../shared/messages';
 
-const startSet = () => {
+const startSet = (): actions.MarkAction => {
   return { type: actions.MARK_START_SET };
 };
 
-const startJump = () => {
+const startJump = (): actions.MarkAction => {
   return { type: actions.MARK_START_JUMP };
 };
 
-const cancel = () => {
+const cancel = (): actions.MarkAction => {
   return { type: actions.MARK_CANCEL };
 };
 
-const setLocal = (key, x, y) => {
+const setLocal = (key: string, x: number, y: number): actions.MarkAction => {
   return {
     type: actions.MARK_SET_LOCAL,
     key,
@@ -22,22 +22,22 @@ const setLocal = (key, x, y) => {
   };
 };
 
-const setGlobal = (key, x, y) => {
+const setGlobal = (key: string, x: number, y: number): actions.MarkAction => {
   browser.runtime.sendMessage({
     type: messages.MARK_SET_GLOBAL,
     key,
     x,
     y,
   });
-  return { type: '' };
+  return { type: actions.NOOP };
 };
 
-const jumpGlobal = (key) => {
+const jumpGlobal = (key: string): actions.MarkAction => {
   browser.runtime.sendMessage({
     type: messages.MARK_JUMP_GLOBAL,
     key,
   });
-  return { type: '' };
+  return { type: actions.NOOP };
 };
 
 export {
diff --git a/src/content/actions/operation.ts b/src/content/actions/operation.ts
index ed9b2cf..6acb407 100644
--- a/src/content/actions/operation.ts
+++ b/src/content/actions/operation.ts
@@ -1,16 +1,21 @@
-import operations from 'shared/operations';
-import messages from 'shared/messages';
-import * as scrolls from 'content/scrolls';
-import * as navigates from 'content/navigates';
-import * as focuses from 'content/focuses';
-import * as urls from 'content/urls';
-import * as consoleFrames from 'content/console-frames';
+import * as operations from '../../shared/operations';
+import * as actions from './index';
+import * as messages from '../../shared/messages';
+import * as scrolls from '../scrolls';
+import * as navigates from '../navigates';
+import * as focuses from '../focuses';
+import * as urls from '../urls';
+import * as consoleFrames from '../console-frames';
 import * as addonActions from './addon';
 import * as markActions from './mark';
-import * as properties from 'shared/settings/properties';
+import * as properties from '../../shared/settings/properties';
 
 // eslint-disable-next-line complexity, max-lines-per-function
-const exec = (operation, settings, addonEnabled) => {
+const exec = (
+  operation: operations.Operation,
+  settings: any,
+  addonEnabled: boolean,
+): Promise<actions.Action> | actions.Action => {
   let smoothscroll = settings.properties.smoothscroll ||
     properties.defaults.smoothscroll;
   switch (operation.type) {
@@ -98,7 +103,7 @@ const exec = (operation, settings, addonEnabled) => {
       operation,
     });
   }
-  return { type: '' };
+  return { type: actions.NOOP };
 };
 
 export { exec };
diff --git a/src/content/actions/setting.ts b/src/content/actions/setting.ts
index 1c15dd7..a8f049a 100644
--- a/src/content/actions/setting.ts
+++ b/src/content/actions/setting.ts
@@ -1,15 +1,15 @@
-import actions from 'content/actions';
-import * as keyUtils from 'shared/utils/keys';
-import operations from 'shared/operations';
-import messages from 'shared/messages';
+import * as actions from './index';
+import * as keyUtils from '../../shared/utils/keys';
+import * as operations from '../../shared/operations';
+import * as messages from '../../shared/messages';
 
 const reservedKeymaps = {
   '<Esc>': { type: operations.CANCEL },
   '<C-[>': { type: operations.CANCEL },
 };
 
-const set = (value) => {
-  let entries = [];
+const set = (value: any): actions.SettingAction => {
+  let entries: any[] = [];
   if (value.keymaps) {
     let keymaps = { ...value.keymaps, ...reservedKeymaps };
     entries = Object.entries(keymaps).map((entry) => {
@@ -27,7 +27,7 @@ const set = (value) => {
   };
 };
 
-const load = async() => {
+const load = async(): Promise<actions.SettingAction> => {
   let settings = await browser.runtime.sendMessage({
     type: messages.SETTINGS_QUERY,
   });
diff --git a/src/content/components/common/follow.ts b/src/content/components/common/follow.ts
index 63ce603..67f2dd9 100644
--- a/src/content/components/common/follow.ts
+++ b/src/content/components/common/follow.ts
@@ -1,6 +1,8 @@
-import messages from 'shared/messages';
+import MessageListener from '../../MessageListener';
 import Hint from './hint';
-import * as dom from 'shared/utils/dom';
+import * as dom from '../../../shared/utils/dom';
+import * as messages from '../../../shared/messages';
+import * as keyUtils from '../../../shared/utils/keys';
 
 const TARGET_SELECTOR = [
   'a', 'button', 'input', 'textarea', 'area',
@@ -8,8 +10,22 @@ const TARGET_SELECTOR = [
   '[role="button"]', 'summary'
 ].join(',');
 
+interface Size {
+  width: number;
+  height: number;
+}
+
+interface Point {
+  x: number;
+  y: number;
+}
 
-const inViewport = (win, element, viewSize, framePosition) => {
+const inViewport = (
+  win: Window,
+  element: Element,
+  viewSize: Size,
+  framePosition: Point,
+): boolean => {
   let {
     top, left, bottom, right
   } = dom.viewportRect(element);
@@ -30,34 +46,44 @@ const inViewport = (win, element, viewSize, framePosition) => {
   return true;
 };
 
-const isAriaHiddenOrAriaDisabled = (win, element) => {
+const isAriaHiddenOrAriaDisabled = (win: Window, element: Element): boolean => {
   if (!element || win.document.documentElement === element) {
     return false;
   }
   for (let attr of ['aria-hidden', 'aria-disabled']) {
-    if (element.hasAttribute(attr)) {
-      let hidden = element.getAttribute(attr).toLowerCase();
+    let value = element.getAttribute(attr);
+    if (value !== null) {
+      let hidden = value.toLowerCase();
       if (hidden === '' || hidden === 'true') {
         return true;
       }
     }
   }
-  return isAriaHiddenOrAriaDisabled(win, element.parentNode);
+  return isAriaHiddenOrAriaDisabled(win, element.parentElement as Element);
 };
 
 export default class Follow {
-  constructor(win, store) {
+  private win: Window;
+
+  private newTab: boolean;
+
+  private background: boolean;
+
+  private hints: {[key: string]: Hint };
+
+  private targets: HTMLElement[] = [];
+
+  constructor(win: Window) {
     this.win = win;
-    this.store = store;
     this.newTab = false;
     this.background = false;
     this.hints = {};
     this.targets = [];
 
-    messages.onMessage(this.onMessage.bind(this));
+    new MessageListener().onWebMessage(this.onMessage.bind(this));
   }
 
-  key(key) {
+  key(key: keyUtils.Key): boolean {
     if (Object.keys(this.hints).length === 0) {
       return false;
     }
@@ -69,7 +95,7 @@ export default class Follow {
     return true;
   }
 
-  openLink(element) {
+  openLink(element: HTMLAreaElement|HTMLAnchorElement) {
     // Browser prevent new tab by link with target='_blank'
     if (!this.newTab && element.getAttribute('target') !== '_blank') {
       element.click();
@@ -90,7 +116,7 @@ export default class Follow {
     });
   }
 
-  countHints(sender, viewSize, framePosition) {
+  countHints(sender: any, viewSize: Size, framePosition: Point) {
     this.targets = Follow.getTargetElements(this.win, viewSize, framePosition);
     sender.postMessage(JSON.stringify({
       type: messages.FOLLOW_RESPONSE_COUNT_TARGETS,
@@ -98,7 +124,7 @@ export default class Follow {
     }), '*');
   }
 
-  createHints(keysArray, newTab, background) {
+  createHints(keysArray: string[], newTab: boolean, background: boolean) {
     if (keysArray.length !== this.targets.length) {
       throw new Error('illegal hint count');
     }
@@ -113,7 +139,7 @@ export default class Follow {
     }
   }
 
-  showHints(keys) {
+  showHints(keys: string) {
     Object.keys(this.hints).filter(key => key.startsWith(keys))
       .forEach(key => this.hints[key].show());
     Object.keys(this.hints).filter(key => !key.startsWith(keys))
@@ -128,18 +154,19 @@ export default class Follow {
     this.targets = [];
   }
 
-  activateHints(keys) {
+  activateHints(keys: string) {
     let hint = this.hints[keys];
     if (!hint) {
       return;
     }
-    let element = hint.target;
+    let element = hint.getTarget();
     switch (element.tagName.toLowerCase()) {
     case 'a':
+      return this.openLink(element as HTMLAnchorElement);
     case 'area':
-      return this.openLink(element);
+      return this.openLink(element as HTMLAreaElement);
     case 'input':
-      switch (element.type) {
+      switch ((element as HTMLInputElement).type) {
       case 'file':
       case 'checkbox':
       case 'radio':
@@ -166,7 +193,7 @@ export default class Follow {
     }
   }
 
-  onMessage(message, sender) {
+  onMessage(message: messages.Message, sender: any) {
     switch (message.type) {
     case messages.FOLLOW_REQUEST_COUNT_TARGETS:
       return this.countHints(sender, message.viewSize, message.framePosition);
@@ -178,19 +205,23 @@ export default class Follow {
     case messages.FOLLOW_ACTIVATE:
       return this.activateHints(message.keys);
     case messages.FOLLOW_REMOVE_HINTS:
-      return this.removeHints(message.keys);
+      return this.removeHints();
     }
   }
 
-  static getTargetElements(win, viewSize, framePosition) {
+  static getTargetElements(
+    win: Window,
+    viewSize:
+    Size, framePosition: Point,
+  ): HTMLElement[] {
     let all = win.document.querySelectorAll(TARGET_SELECTOR);
-    let filtered = Array.prototype.filter.call(all, (element) => {
+    let filtered = Array.prototype.filter.call(all, (element: HTMLElement) => {
       let style = win.getComputedStyle(element);
 
       // AREA's 'display' in Browser style is 'none'
       return (element.tagName === 'AREA' || style.display !== 'none') &&
         style.visibility !== 'hidden' &&
-        element.type !== 'hidden' &&
+        (element as HTMLInputElement).type !== 'hidden' &&
         element.offsetHeight > 0 &&
         !isAriaHiddenOrAriaDisabled(win, element) &&
         inViewport(win, element, viewSize, framePosition);
diff --git a/src/content/components/common/hint.ts b/src/content/components/common/hint.ts
index 1472587..2fcbb0f 100644
--- a/src/content/components/common/hint.ts
+++ b/src/content/components/common/hint.ts
@@ -1,6 +1,11 @@
-import * as dom from 'shared/utils/dom';
+import * as dom from '../../../shared/utils/dom';
 
-const hintPosition = (element) => {
+interface Point {
+  x: number;
+  y: number;
+}
+
+const hintPosition = (element: Element): Point => {
   let { left, top, right, bottom } = dom.viewportRect(element);
 
   if (element.tagName !== 'AREA') {
@@ -14,17 +19,21 @@ const hintPosition = (element) => {
 };
 
 export default class Hint {
-  constructor(target, tag) {
-    if (!(document.body instanceof HTMLElement)) {
-      throw new TypeError('target is not an HTMLElement');
-    }
+  private target: HTMLElement;
 
-    this.target = target;
+  private element: HTMLElement;
 
+  constructor(target: HTMLElement, tag: string) {
     let doc = target.ownerDocument;
+    if (doc === null) {
+      throw new TypeError('ownerDocument is null');
+    }
+
     let { x, y } = hintPosition(target);
     let { scrollX, scrollY } = window;
 
+    this.target = target;
+
     this.element = doc.createElement('span');
     this.element.className = 'vimvixen-hint';
     this.element.textContent = tag;
@@ -35,15 +44,19 @@ export default class Hint {
     doc.body.append(this.element);
   }
 
-  show() {
+  show(): void {
     this.element.style.display = 'inline';
   }
 
-  hide() {
+  hide(): void {
     this.element.style.display = 'none';
   }
 
-  remove() {
+  remove(): void {
     this.element.remove();
   }
+
+  getTarget(): HTMLElement {
+    return this.target;
+  }
 }
diff --git a/src/content/components/common/index.ts b/src/content/components/common/index.ts
index bcab4fa..9b5164e 100644
--- a/src/content/components/common/index.ts
+++ b/src/content/components/common/index.ts
@@ -2,33 +2,37 @@ import InputComponent from './input';
 import FollowComponent from './follow';
 import MarkComponent from './mark';
 import KeymapperComponent from './keymapper';
-import * as settingActions from 'content/actions/setting';
-import messages from 'shared/messages';
+import * as settingActions from '../../actions/setting';
+import * as messages from '../../../shared/messages';
+import MessageListener from '../../MessageListener';
 import * as addonActions from '../../actions/addon';
-import * as blacklists from 'shared/blacklists';
+import * as blacklists from '../../../shared/blacklists';
+import * as keys from '../../../shared/utils/keys';
 
 export default class Common {
-  constructor(win, store) {
-    const input = new InputComponent(win.document.body, store);
-    const follow = new FollowComponent(win, store);
+  private win: Window;
+
+  private store: any;
+
+  constructor(win: Window, store: any) {
+    const input = new InputComponent(win.document.body);
+    const follow = new FollowComponent(win);
     const mark = new MarkComponent(win.document.body, store);
     const keymapper = new KeymapperComponent(store);
 
-    input.onKey(key => follow.key(key));
-    input.onKey(key => mark.key(key));
-    input.onKey(key => keymapper.key(key));
+    input.onKey((key: keys.Key) => follow.key(key));
+    input.onKey((key: keys.Key) => mark.key(key));
+    input.onKey((key: keys.Key) => keymapper.key(key));
 
     this.win = win;
     this.store = store;
-    this.prevEnabled = undefined;
-    this.prevBlacklist = undefined;
 
     this.reloadSettings();
 
-    messages.onMessage(this.onMessage.bind(this));
+    new MessageListener().onBackgroundMessage(this.onMessage.bind(this));
   }
 
-  onMessage(message) {
+  onMessage(message: messages.Message) {
     let { enabled } = this.store.getState().addon;
     switch (message.type) {
     case messages.SETTINGS_CHANGED:
@@ -40,12 +44,13 @@ export default class Common {
 
   reloadSettings() {
     try {
-      this.store.dispatch(settingActions.load()).then(({ value: settings }) => {
-        let enabled = !blacklists.includes(
-          settings.blacklist, this.win.location.href
-        );
-        this.store.dispatch(addonActions.setEnabled(enabled));
-      });
+      this.store.dispatch(settingActions.load())
+        .then(({ value: settings }: any) => {
+          let enabled = !blacklists.includes(
+            settings.blacklist, this.win.location.href
+          );
+          this.store.dispatch(addonActions.setEnabled(enabled));
+        });
     } catch (e) {
       // Sometime sendMessage fails when background script is not ready.
       console.warn(e);
diff --git a/src/content/components/common/input.ts b/src/content/components/common/input.ts
index eefaf10..64eb5f3 100644
--- a/src/content/components/common/input.ts
+++ b/src/content/components/common/input.ts
@@ -1,12 +1,16 @@
-import * as dom from 'shared/utils/dom';
-import * as keys from 'shared/utils/keys';
+import * as dom from '../../../shared/utils/dom';
+import * as keys from '../../../shared/utils/keys';
 
-const cancelKey = (e) => {
+const cancelKey = (e: KeyboardEvent): boolean => {
   return e.key === 'Escape' || e.key === '[' && e.ctrlKey;
 };
 
 export default class InputComponent {
-  constructor(target) {
+  private pressed: {[key: string]: string} = {};
+
+  private onKeyListeners: ((key: keys.Key) => boolean)[] = [];
+
+  constructor(target: HTMLElement) {
     this.pressed = {};
     this.onKeyListeners = [];
 
@@ -15,11 +19,11 @@ export default class InputComponent {
     target.addEventListener('keyup', this.onKeyUp.bind(this));
   }
 
-  onKey(cb) {
+  onKey(cb: (key: keys.Key) => boolean) {
     this.onKeyListeners.push(cb);
   }
 
-  onKeyPress(e) {
+  onKeyPress(e: KeyboardEvent) {
     if (this.pressed[e.key] && this.pressed[e.key] !== 'keypress') {
       return;
     }
@@ -27,7 +31,7 @@ export default class InputComponent {
     this.capture(e);
   }
 
-  onKeyDown(e) {
+  onKeyDown(e: KeyboardEvent) {
     if (this.pressed[e.key] && this.pressed[e.key] !== 'keydown') {
       return;
     }
@@ -35,14 +39,19 @@ export default class InputComponent {
     this.capture(e);
   }
 
-  onKeyUp(e) {
+  onKeyUp(e: KeyboardEvent) {
     delete this.pressed[e.key];
   }
 
-  capture(e) {
-    if (this.fromInput(e)) {
-      if (cancelKey(e) && e.target.blur) {
-        e.target.blur();
+  // eslint-disable-next-line max-statements
+  capture(e: KeyboardEvent) {
+    let target = e.target;
+    if (!(target instanceof HTMLElement)) {
+      return;
+    }
+    if (this.fromInput(target)) {
+      if (cancelKey(e) && target.blur) {
+        target.blur();
       }
       return;
     }
@@ -63,13 +72,10 @@ export default class InputComponent {
     }
   }
 
-  fromInput(e) {
-    if (!e.target) {
-      return false;
-    }
-    return e.target instanceof HTMLInputElement ||
-      e.target instanceof HTMLTextAreaElement ||
-      e.target instanceof HTMLSelectElement ||
-      dom.isContentEditable(e.target);
+  fromInput(e: Element) {
+    return e instanceof HTMLInputElement ||
+      e instanceof HTMLTextAreaElement ||
+      e instanceof HTMLSelectElement ||
+      dom.isContentEditable(e);
   }
 }
diff --git a/src/content/components/common/keymapper.ts b/src/content/components/common/keymapper.ts
index ec0d093..d9c9834 100644
--- a/src/content/components/common/keymapper.ts
+++ b/src/content/components/common/keymapper.ts
@@ -1,7 +1,7 @@
-import * as inputActions from 'content/actions/input';
-import * as operationActions from 'content/actions/operation';
-import operations from 'shared/operations';
-import * as keyUtils from 'shared/utils/keys';
+import * as inputActions from '../../actions/input';
+import * as operationActions from '../../actions/operation';
+import * as operations from '../../../shared/operations';
+import * as keyUtils from '../../../shared/utils/keys';
 
 const mapStartsWith = (mapping, keys) => {
   if (mapping.length < keys.length) {
diff --git a/src/content/components/common/mark.ts b/src/content/components/common/mark.ts
index 0f838a9..500d03b 100644
--- a/src/content/components/common/mark.ts
+++ b/src/content/components/common/mark.ts
@@ -3,7 +3,7 @@ import * as scrolls from 'content/scrolls';
 import * as consoleFrames from 'content/console-frames';
 import * as properties from 'shared/settings/properties';
 
-const cancelKey = (key) => {
+const cancelKey = (key): boolean => {
   return key.key === 'Esc' || key.key === '[' && key.ctrlKey;
 };
 
diff --git a/src/content/components/top-content/find.ts b/src/content/components/top-content/find.ts
index 4d46d79..74b95bc 100644
--- a/src/content/components/top-content/find.ts
+++ b/src/content/components/top-content/find.ts
@@ -1,15 +1,17 @@
-import * as findActions from 'content/actions/find';
-import messages from 'shared/messages';
+import * as findActions from '../../actions/find';
+import * as messages from '../../../shared/messages';
+import MessageListener from '../../MessageListener';
 
 export default class FindComponent {
-  constructor(win, store) {
-    this.win = win;
+  private store: any;
+
+  constructor(store: any) {
     this.store = store;
 
-    messages.onMessage(this.onMessage.bind(this));
+    new MessageListener().onWebMessage(this.onMessage.bind(this));
   }
 
-  onMessage(message) {
+  onMessage(message: messages.Message) {
     switch (message.type) {
     case messages.CONSOLE_ENTER_FIND:
       return this.start(message.text);
@@ -20,22 +22,25 @@ export default class FindComponent {
     }
   }
 
-  start(text) {
+  start(text: string) {
     let state = this.store.getState().find;
 
     if (text.length === 0) {
-      return this.store.dispatch(findActions.next(state.keyword, true));
+      return this.store.dispatch(
+        findActions.next(state.keyword as string, true));
     }
     return this.store.dispatch(findActions.next(text, true));
   }
 
   next() {
     let state = this.store.getState().find;
-    return this.store.dispatch(findActions.next(state.keyword, false));
+    return this.store.dispatch(
+      findActions.next(state.keyword as string, false));
   }
 
   prev() {
     let state = this.store.getState().find;
-    return this.store.dispatch(findActions.prev(state.keyword, false));
+    return this.store.dispatch(
+      findActions.prev(state.keyword as string, false));
   }
 }
diff --git a/src/content/components/top-content/follow-controller.ts b/src/content/components/top-content/follow-controller.ts
index 7f36604..be71f6e 100644
--- a/src/content/components/top-content/follow-controller.ts
+++ b/src/content/components/top-content/follow-controller.ts
@@ -1,30 +1,46 @@
-import * as followControllerActions from 'content/actions/follow-controller';
-import messages from 'shared/messages';
-import HintKeyProducer from 'content/hint-key-producer';
-import * as properties from 'shared/settings/properties';
+import * as followControllerActions from '../../actions/follow-controller';
+import * as messages from '../../../shared/messages';
+import MessageListener, { WebMessageSender } from '../../MessageListener';
+import HintKeyProducer from '../../hint-key-producer';
+import * as properties from '../../../shared/settings/properties';
 
-const broadcastMessage = (win, message) => {
+const broadcastMessage = (win: Window, message: messages.Message): void => {
   let json = JSON.stringify(message);
-  let frames = [window.self].concat(Array.from(window.frames));
+  let frames = [win.self].concat(Array.from(win.frames as any));
   frames.forEach(frame => frame.postMessage(json, '*'));
 };
 
 export default class FollowController {
-  constructor(win, store) {
+  private win: Window;
+
+  private store: any;
+
+  private state: {
+    enabled?: boolean;
+    newTab?: boolean;
+    background?: boolean;
+    keys?: string,
+  };
+
+  private keys: string[];
+
+  private producer: HintKeyProducer | null;
+
+  constructor(win: Window, store: any) {
     this.win = win;
     this.store = store;
     this.state = {};
     this.keys = [];
     this.producer = null;
 
-    messages.onMessage(this.onMessage.bind(this));
+    new MessageListener().onWebMessage(this.onMessage.bind(this));
 
     store.subscribe(() => {
       this.update();
     });
   }
 
-  onMessage(message, sender) {
+  onMessage(message: messages.Message, sender: WebMessageSender) {
     switch (message.type) {
     case messages.FOLLOW_START:
       return this.store.dispatch(
@@ -36,7 +52,7 @@ export default class FollowController {
     }
   }
 
-  update() {
+  update(): void {
     let prevState = this.state;
     this.state = this.store.getState().followController;
 
@@ -49,8 +65,10 @@ export default class FollowController {
     }
   }
 
-  updateHints() {
-    let shown = this.keys.filter(key => key.startsWith(this.state.keys));
+  updateHints(): void {
+    let shown = this.keys.filter((key) => {
+      return key.startsWith(this.state.keys as string);
+    });
     if (shown.length === 1) {
       this.activate();
       this.store.dispatch(followControllerActions.disable());
@@ -58,18 +76,18 @@ export default class FollowController {
 
     broadcastMessage(this.win, {
       type: messages.FOLLOW_SHOW_HINTS,
-      keys: this.state.keys,
+      keys: this.state.keys as string,
     });
   }
 
-  activate() {
+  activate(): void {
     broadcastMessage(this.win, {
       type: messages.FOLLOW_ACTIVATE,
-      keys: this.state.keys,
+      keys: this.state.keys as string,
     });
   }
 
-  keyPress(key, ctrlKey) {
+  keyPress(key: string, ctrlKey: boolean): boolean {
     if (key === '[' && ctrlKey) {
       this.store.dispatch(followControllerActions.disable());
       return true;
@@ -107,25 +125,28 @@ export default class FollowController {
       viewSize: { width: viewWidth, height: viewHeight },
       framePosition: { x: 0, y: 0 },
     }), '*');
-    frameElements.forEach((element) => {
-      let { left: frameX, top: frameY } = element.getBoundingClientRect();
+    frameElements.forEach((ele) => {
+      let { left: frameX, top: frameY } = ele.getBoundingClientRect();
       let message = JSON.stringify({
         type: messages.FOLLOW_REQUEST_COUNT_TARGETS,
         viewSize: { width: viewWidth, height: viewHeight },
         framePosition: { x: frameX, y: frameY },
       });
-      element.contentWindow.postMessage(message, '*');
+      if (ele instanceof HTMLFrameElement && ele.contentWindow ||
+        ele instanceof HTMLIFrameElement && ele.contentWindow) {
+        ele.contentWindow.postMessage(message, '*');
+      }
     });
   }
 
-  create(count, sender) {
+  create(count: number, sender: WebMessageSender) {
     let produced = [];
     for (let i = 0; i < count; ++i) {
-      produced.push(this.producer.produce());
+      produced.push((this.producer as HintKeyProducer).produce());
     }
     this.keys = this.keys.concat(produced);
 
-    sender.postMessage(JSON.stringify({
+    (sender as Window).postMessage(JSON.stringify({
       type: messages.FOLLOW_CREATE_HINTS,
       keysArray: produced,
       newTab: this.state.newTab,
diff --git a/src/content/components/top-content/index.ts b/src/content/components/top-content/index.ts
index 1aaef1b..ac95ea9 100644
--- a/src/content/components/top-content/index.ts
+++ b/src/content/components/top-content/index.ts
@@ -2,33 +2,43 @@ import CommonComponent from '../common';
 import FollowController from './follow-controller';
 import FindComponent from './find';
 import * as consoleFrames from '../../console-frames';
-import messages from 'shared/messages';
-import * as scrolls from 'content/scrolls';
+import * as messages from '../../../shared/messages';
+import MessageListener from '../../MessageListener';
+import * as scrolls from '../../scrolls';
 
 export default class TopContent {
+  private win: Window;
 
-  constructor(win, store) {
+  private store: any;
+
+  constructor(win: Window, store: any) {
     this.win = win;
     this.store = store;
 
     new CommonComponent(win, store); // eslint-disable-line no-new
     new FollowController(win, store); // eslint-disable-line no-new
-    new FindComponent(win, store); // eslint-disable-line no-new
+    new FindComponent(store); // eslint-disable-line no-new
 
     // TODO make component
     consoleFrames.initialize(this.win.document);
 
-    messages.onMessage(this.onMessage.bind(this));
+    new MessageListener().onWebMessage(this.onWebMessage.bind(this));
+    new MessageListener().onBackgroundMessage(
+      this.onBackgroundMessage.bind(this));
   }
 
-  onMessage(message) {
-    let addonState = this.store.getState().addon;
-
+  onWebMessage(message: messages.Message) {
     switch (message.type) {
     case messages.CONSOLE_UNFOCUS:
       this.win.focus();
       consoleFrames.blur(window.document);
-      return Promise.resolve();
+    }
+  }
+
+  onBackgroundMessage(message: messages.Message) {
+    let addonState = this.store.getState().addon;
+
+    switch (message.type) {
     case messages.ADDON_ENABLED_QUERY:
       return Promise.resolve({
         type: messages.ADDON_ENABLED_RESPONSE,
diff --git a/src/content/console-frames.ts b/src/content/console-frames.ts
index ecb5a87..bd6b835 100644
--- a/src/content/console-frames.ts
+++ b/src/content/console-frames.ts
@@ -1,6 +1,6 @@
-import messages from 'shared/messages';
+import * as messages from '../shared/messages';
 
-const initialize = (doc) => {
+const initialize = (doc: Document): HTMLIFrameElement => {
   let iframe = doc.createElement('iframe');
   iframe.src = browser.runtime.getURL('build/console.html');
   iframe.id = 'vimvixen-console-frame';
@@ -10,13 +10,13 @@ const initialize = (doc) => {
   return iframe;
 };
 
-const blur = (doc) => {
-  let iframe = doc.getElementById('vimvixen-console-frame');
-  iframe.blur();
+const blur = (doc: Document) => {
+  let ele = doc.getElementById('vimvixen-console-frame') as HTMLIFrameElement;
+  ele.blur();
 };
 
-const postError = (text) => {
-  browser.runtime.sendMessage({
+const postError = (text: string): Promise<any> => {
+  return browser.runtime.sendMessage({
     type: messages.CONSOLE_FRAME_MESSAGE,
     message: {
       type: messages.CONSOLE_SHOW_ERROR,
@@ -25,8 +25,8 @@ const postError = (text) => {
   });
 };
 
-const postInfo = (text) => {
-  browser.runtime.sendMessage({
+const postInfo = (text: string): Promise<any> => {
+  return browser.runtime.sendMessage({
     type: messages.CONSOLE_FRAME_MESSAGE,
     message: {
       type: messages.CONSOLE_SHOW_INFO,
diff --git a/src/content/focuses.ts b/src/content/focuses.ts
index a6f6cc8..8f53881 100644
--- a/src/content/focuses.ts
+++ b/src/content/focuses.ts
@@ -1,11 +1,13 @@
-import * as doms from 'shared/utils/dom';
+import * as doms from '../shared/utils/dom';
 
-const focusInput = () => {
+const focusInput = (): void => {
   let inputTypes = ['email', 'number', 'search', 'tel', 'text', 'url'];
   let inputSelector = inputTypes.map(type => `input[type=${type}]`).join(',');
   let targets = window.document.querySelectorAll(inputSelector + ',textarea');
   let target = Array.from(targets).find(doms.isVisible);
-  if (target) {
+  if (target instanceof HTMLInputElement) {
+    target.focus();
+  } else if (target instanceof HTMLTextAreaElement) {
     target.focus();
   }
 };
diff --git a/src/content/hint-key-producer.ts b/src/content/hint-key-producer.ts
index 14b23b6..935394e 100644
--- a/src/content/hint-key-producer.ts
+++ b/src/content/hint-key-producer.ts
@@ -1,5 +1,9 @@
 export default class HintKeyProducer {
-  constructor(charset) {
+  private charset: string;
+
+  private counter: number[];
+
+  constructor(charset: string) {
     if (charset.length === 0) {
       throw new TypeError('charset is empty');
     }
@@ -8,13 +12,13 @@ export default class HintKeyProducer {
     this.counter = [];
   }
 
-  produce() {
+  produce(): string {
     this.increment();
 
     return this.counter.map(x => this.charset[x]).join('');
   }
 
-  increment() {
+  private increment(): void {
     let max = this.charset.length - 1;
     if (this.counter.every(x => x === max)) {
       this.counter = new Array(this.counter.length + 1).fill(0);
diff --git a/src/content/index.ts b/src/content/index.ts
index 9edb712..309f27f 100644
--- a/src/content/index.ts
+++ b/src/content/index.ts
@@ -1,14 +1,9 @@
-import { createStore, applyMiddleware } from 'redux';
-import promise from 'redux-promise';
-import reducers from 'content/reducers';
 import TopContentComponent from './components/top-content';
 import FrameContentComponent from './components/frame-content';
 import consoleFrameStyle from './site-style';
+import { newStore } from './store';
 
-const store = createStore(
-  reducers,
-  applyMiddleware(promise),
-);
+const store = newStore();
 
 if (window.self === window.top) {
   new TopContentComponent(window, store); // eslint-disable-line no-new
diff --git a/src/content/navigates.ts b/src/content/navigates.ts
index c9baa30..a2007a6 100644
--- a/src/content/navigates.ts
+++ b/src/content/navigates.ts
@@ -1,58 +1,63 @@
-const REL_PATTERN = {
+const REL_PATTERN: {[key: string]: RegExp} = {
   prev: /^(?:prev(?:ious)?|older)\b|\u2039|\u2190|\xab|\u226a|<</i,
   next: /^(?:next|newer)\b|\u203a|\u2192|\xbb|\u226b|>>/i,
 };
 
 // Return the last element in the document matching the supplied selector
 // and the optional filter, or null if there are no matches.
-const selectLast = (win, selector, filter) => {
-  let nodes = win.document.querySelectorAll(selector);
+// eslint-disable-next-line func-style
+function selectLast<E extends Element>(
+  win: Window,
+  selector: string,
+  filter?: (e: E) => boolean,
+): E | null {
+  let nodes = Array.from(
+    win.document.querySelectorAll(selector) as NodeListOf<E>
+  );
 
   if (filter) {
-    nodes = Array.from(nodes).filter(filter);
+    nodes = nodes.filter(filter);
   }
-
   return nodes.length ? nodes[nodes.length - 1] : null;
-};
+}
 
-const historyPrev = (win) => {
+const historyPrev = (win: Window): void => {
   win.history.back();
 };
 
-const historyNext = (win) => {
+const historyNext = (win: Window): void => {
   win.history.forward();
 };
 
 // Code common to linkPrev and linkNext which navigates to the specified page.
-const linkRel = (win, rel) => {
-  let link = selectLast(win, `link[rel~=${rel}][href]`);
-
+const linkRel = (win: Window, rel: string): void => {
+  let link = selectLast<HTMLLinkElement>(win, `link[rel~=${rel}][href]`);
   if (link) {
-    win.location = link.href;
+    win.location.href = link.href;
     return;
   }
 
   const pattern = REL_PATTERN[rel];
 
-  link = selectLast(win, `a[rel~=${rel}][href]`) ||
+  let a = selectLast<HTMLAnchorElement>(win, `a[rel~=${rel}][href]`) ||
     // `innerText` is much slower than `textContent`, but produces much better
     // (i.e. less unexpected) results
     selectLast(win, 'a[href]', lnk => pattern.test(lnk.innerText));
 
-  if (link) {
-    link.click();
+  if (a) {
+    a.click();
   }
 };
 
-const linkPrev = (win) => {
+const linkPrev = (win: Window): void => {
   linkRel(win, 'prev');
 };
 
-const linkNext = (win) => {
+const linkNext = (win: Window): void => {
   linkRel(win, 'next');
 };
 
-const parent = (win) => {
+const parent = (win: Window): void => {
   const loc = win.location;
   if (loc.hash !== '') {
     loc.hash = '';
@@ -71,8 +76,8 @@ const parent = (win) => {
   }
 };
 
-const root = (win) => {
-  win.location = win.location.origin;
+const root = (win: Window): void => {
+  win.location.href = win.location.origin;
 };
 
 export { historyPrev, historyNext, linkPrev, linkNext, parent, root };
diff --git a/src/content/reducers/addon.ts b/src/content/reducers/addon.ts
index 0def55a..2131228 100644
--- a/src/content/reducers/addon.ts
+++ b/src/content/reducers/addon.ts
@@ -1,10 +1,17 @@
-import actions from 'content/actions';
+import * as actions from '../actions';
 
-const defaultState = {
+export interface State {
+  enabled: boolean;
+}
+
+const defaultState: State = {
   enabled: true,
 };
 
-export default function reducer(state = defaultState, action = {}) {
+export default function reducer(
+  state: State = defaultState,
+  action: actions.AddonAction,
+): State {
   switch (action.type) {
   case actions.ADDON_SET_ENABLED:
     return { ...state,
diff --git a/src/content/reducers/find.ts b/src/content/reducers/find.ts
index 4560e2c..8c3e637 100644
--- a/src/content/reducers/find.ts
+++ b/src/content/reducers/find.ts
@@ -1,11 +1,19 @@
-import actions from 'content/actions';
+import * as actions from '../actions';
 
-const defaultState = {
+export interface State {
+  keyword: string | null;
+  found: boolean;
+}
+
+const defaultState: State = {
   keyword: null,
   found: false,
 };
 
-export default function reducer(state = defaultState, action = {}) {
+export default function reducer(
+  state: State = defaultState,
+  action: actions.FindAction,
+): State {
   switch (action.type) {
   case actions.FIND_SET_KEYWORD:
     return { ...state,
diff --git a/src/content/reducers/follow-controller.ts b/src/content/reducers/follow-controller.ts
index 5869c47..6965704 100644
--- a/src/content/reducers/follow-controller.ts
+++ b/src/content/reducers/follow-controller.ts
@@ -1,13 +1,23 @@
-import actions from 'content/actions';
+import * as actions from '../actions';
 
-const defaultState = {
+export interface State {
+  enabled: boolean;
+  newTab: boolean;
+  background: boolean;
+  keys: string,
+}
+
+const defaultState: State = {
   enabled: false,
   newTab: false,
   background: false,
   keys: '',
 };
 
-export default function reducer(state = defaultState, action = {}) {
+export default function reducer(
+  state: State = defaultState,
+  action: actions.FollowAction,
+): State {
   switch (action.type) {
   case actions.FOLLOW_CONTROLLER_ENABLE:
     return { ...state,
diff --git a/src/content/reducers/index.ts b/src/content/reducers/index.ts
index bf612a3..fb5eb84 100644
--- a/src/content/reducers/index.ts
+++ b/src/content/reducers/index.ts
@@ -1,10 +1,20 @@
 import { combineReducers } from 'redux';
-import addon from './addon';
-import find from './find';
-import setting from './setting';
-import input from './input';
-import followController from './follow-controller';
-import mark from './mark';
+import addon, { State as AddonState } from './addon';
+import find, { State as FindState } from './find';
+import setting, { State as SettingState } from './setting';
+import input, { State as InputState } from './input';
+import followController, { State as FollowControllerState }
+  from './follow-controller';
+import mark, { State as MarkState } from './mark';
+
+export interface State {
+  addon: AddonState;
+  find: FindState;
+  setting: SettingState;
+  input: InputState;
+  followController: FollowControllerState;
+  mark: MarkState;
+}
 
 export default combineReducers({
   addon, find, setting, input, followController, mark,
diff --git a/src/content/reducers/input.ts b/src/content/reducers/input.ts
index 23e7dd2..6257e49 100644
--- a/src/content/reducers/input.ts
+++ b/src/content/reducers/input.ts
@@ -1,10 +1,17 @@
-import actions from 'content/actions';
+import * as actions from '../actions';
 
-const defaultState = {
+export interface State {
+  keys: string[];
+}
+
+const defaultState: State = {
   keys: []
 };
 
-export default function reducer(state = defaultState, action = {}) {
+export default function reducer(
+  state: State = defaultState,
+  action: actions.InputAction,
+): State {
   switch (action.type) {
   case actions.INPUT_KEY_PRESS:
     return { ...state,
diff --git a/src/content/reducers/mark.ts b/src/content/reducers/mark.ts
index 2c96cc5..e78b7b9 100644
--- a/src/content/reducers/mark.ts
+++ b/src/content/reducers/mark.ts
@@ -1,12 +1,26 @@
-import actions from 'content/actions';
+import * as actions from '../actions';
 
-const defaultState = {
+interface Mark {
+  x: number;
+  y: number;
+}
+
+export interface State {
+  setMode: boolean;
+  jumpMode: boolean;
+  marks: { [key: string]: Mark };
+}
+
+const defaultState: State = {
   setMode: false,
   jumpMode: false,
   marks: {},
 };
 
-export default function reducer(state = defaultState, action = {}) {
+export default function reducer(
+  state: State = defaultState,
+  action: actions.MarkAction,
+): State {
   switch (action.type) {
   case actions.MARK_START_SET:
     return { ...state, setMode: true };
diff --git a/src/content/reducers/setting.ts b/src/content/reducers/setting.ts
index a49db6d..fa8e8ee 100644
--- a/src/content/reducers/setting.ts
+++ b/src/content/reducers/setting.ts
@@ -1,11 +1,18 @@
-import actions from 'content/actions';
+import * as actions from '../actions';
+
+export interface State {
+  keymaps: any[];
+}
 
 const defaultState = {
   // keymaps is and arrays of key-binding pairs, which is entries of Map
   keymaps: [],
 };
 
-export default function reducer(state = defaultState, action = {}) {
+export default function reducer(
+  state: State = defaultState,
+  action: actions.SettingAction,
+): State {
   switch (action.type) {
   case actions.SETTING_SET:
     return { ...action.value };
diff --git a/src/content/scrolls.ts b/src/content/scrolls.ts
index bbf2491..6a35315 100644
--- a/src/content/scrolls.ts
+++ b/src/content/scrolls.ts
@@ -1,19 +1,19 @@
-import * as doms from 'shared/utils/dom';
+import * as doms from '../shared/utils/dom';
 
 const SCROLL_DELTA_X = 64;
 const SCROLL_DELTA_Y = 64;
 
 // dirty way to store scrolling state on globally
 let scrolling = false;
-let lastTimeoutId = null;
+let lastTimeoutId: number | null = null;
 
-const isScrollableStyle = (element) => {
+const isScrollableStyle = (element: Element): boolean => {
   let { overflowX, overflowY } = window.getComputedStyle(element);
   return !(overflowX !== 'scroll' && overflowX !== 'auto' &&
     overflowY !== 'scroll' && overflowY !== 'auto');
 };
 
-const isOverflowed = (element) => {
+const isOverflowed = (element: Element): boolean => {
   return element.scrollWidth > element.clientWidth ||
     element.scrollHeight > element.clientHeight;
 };
@@ -22,7 +22,7 @@ const isOverflowed = (element) => {
 // this method is called by each scrolling, and the returned value of this
 // method is not cached.  That does not cause performance issue because in the
 // most pages, the window is root element i,e, documentElement.
-const findScrollable = (element) => {
+const findScrollable = (element: Element): Element | null => {
   if (isScrollableStyle(element) && isOverflowed(element)) {
     return element;
   }
@@ -56,12 +56,16 @@ const resetScrolling = () => {
 };
 
 class Scroller {
-  constructor(element, smooth) {
+  private element: Element;
+
+  private smooth: boolean;
+
+  constructor(element: Element, smooth: boolean) {
     this.element = element;
     this.smooth = smooth;
   }
 
-  scrollTo(x, y) {
+  scrollTo(x: number, y: number): void {
     if (!this.smooth) {
       this.element.scrollTo(x, y);
       return;
@@ -74,13 +78,13 @@ class Scroller {
     this.prepareReset();
   }
 
-  scrollBy(x, y) {
+  scrollBy(x: number, y: number): void {
     let left = this.element.scrollLeft + x;
     let top = this.element.scrollTop + y;
     this.scrollTo(left, top);
   }
 
-  prepareReset() {
+  prepareReset(): void {
     scrolling = true;
     if (lastTimeoutId) {
       clearTimeout(lastTimeoutId);
@@ -95,7 +99,7 @@ const getScroll = () => {
   return { x: target.scrollLeft, y: target.scrollTop };
 };
 
-const scrollVertically = (count, smooth) => {
+const scrollVertically = (count: number, smooth: boolean): void => {
   let target = scrollTarget();
   let delta = SCROLL_DELTA_Y * count;
   if (scrolling) {
@@ -104,7 +108,7 @@ const scrollVertically = (count, smooth) => {
   new Scroller(target, smooth).scrollBy(0, delta);
 };
 
-const scrollHorizonally = (count, smooth) => {
+const scrollHorizonally = (count: number, smooth: boolean): void => {
   let target = scrollTarget();
   let delta = SCROLL_DELTA_X * count;
   if (scrolling) {
@@ -113,7 +117,7 @@ const scrollHorizonally = (count, smooth) => {
   new Scroller(target, smooth).scrollBy(delta, 0);
 };
 
-const scrollPages = (count, smooth) => {
+const scrollPages = (count: number, smooth: boolean): void => {
   let target = scrollTarget();
   let height = target.clientHeight;
   let delta = height * count;
@@ -123,33 +127,33 @@ const scrollPages = (count, smooth) => {
   new Scroller(target, smooth).scrollBy(0, delta);
 };
 
-const scrollTo = (x, y, smooth) => {
+const scrollTo = (x: number, y: number, smooth: boolean): void => {
   let target = scrollTarget();
   new Scroller(target, smooth).scrollTo(x, y);
 };
 
-const scrollToTop = (smooth) => {
+const scrollToTop = (smooth: boolean): void => {
   let target = scrollTarget();
   let x = target.scrollLeft;
   let y = 0;
   new Scroller(target, smooth).scrollTo(x, y);
 };
 
-const scrollToBottom = (smooth) => {
+const scrollToBottom = (smooth: boolean): void => {
   let target = scrollTarget();
   let x = target.scrollLeft;
   let y = target.scrollHeight;
   new Scroller(target, smooth).scrollTo(x, y);
 };
 
-const scrollToHome = (smooth) => {
+const scrollToHome = (smooth: boolean): void => {
   let target = scrollTarget();
   let x = 0;
   let y = target.scrollTop;
   new Scroller(target, smooth).scrollTo(x, y);
 };
 
-const scrollToEnd = (smooth) => {
+const scrollToEnd = (smooth: boolean): void => {
   let target = scrollTarget();
   let x = target.scrollWidth;
   let y = target.scrollTop;
diff --git a/src/content/store/index.ts b/src/content/store/index.ts
new file mode 100644
index 0000000..5c41744
--- /dev/null
+++ b/src/content/store/index.ts
@@ -0,0 +1,8 @@
+import promise from 'redux-promise';
+import reducers from '../reducers';
+import { createStore, applyMiddleware } from 'redux';
+
+export const newStore = () => createStore(
+  reducers,
+  applyMiddleware(promise),
+);
diff --git a/src/content/urls.ts b/src/content/urls.ts
index 6e7ea31..390efde 100644
--- a/src/content/urls.ts
+++ b/src/content/urls.ts
@@ -1,7 +1,7 @@
-import messages from 'shared/messages';
+import * as messages from '../shared/messages';
 import * as urls from '../shared/urls';
 
-const yank = (win) => {
+const yank = (win: Window) => {
   let input = win.document.createElement('input');
   win.document.body.append(input);
 
@@ -15,7 +15,7 @@ const yank = (win) => {
   input.remove();
 };
 
-const paste = (win, newTab, searchSettings) => {
+const paste = (win: Window, newTab: boolean, searchSettings: any) => {
   let textarea = win.document.createElement('textarea');
   win.document.body.append(textarea);
 
@@ -25,7 +25,7 @@ const paste = (win, newTab, searchSettings) => {
   textarea.focus();
 
   if (win.document.execCommand('paste')) {
-    let value = textarea.textContent;
+    let value = textarea.textContent as string;
     let url = urls.searchUrl(value, searchSettings);
     browser.runtime.sendMessage({
       type: messages.OPEN_URL,