Types src/content

47 files changed, 1358 insertions, 464 deletions

diff --git a/src/background/controllers/OperationController.ts b/src/background/controllers/OperationController.ts
index 4e9c106..fa09512 100644
--- a/src/background/controllers/OperationController.ts
+++ b/src/background/controllers/OperationController.ts
@@ -1,4 +1,4 @@
-import operations from '../../shared/operations';
+import * as operations from '../../shared/operations';
 import FindUseCase from '../usecases/FindUseCase';
 import ConsoleUseCase from '../usecases/ConsoleUseCase';
 import TabUseCase from '../usecases/TabUseCase';
@@ -25,7 +25,7 @@ export default class OperationController {
   }
 
   // eslint-disable-next-line complexity, max-lines-per-function
-  exec(operation: any): Promise<any> {
+  exec(operation: operations.Operation): Promise<any> {
     switch (operation.type) {
     case operations.TAB_CLOSE:
       return this.tabUseCase.close(false);
diff --git a/src/background/controllers/VersionController.ts b/src/background/controllers/VersionController.ts
index f402ed0..2e2a197 100644
--- a/src/background/controllers/VersionController.ts
+++ b/src/background/controllers/VersionController.ts
@@ -7,7 +7,7 @@ export default class VersionController {
     this.versionUseCase = new VersionUseCase();
   }
 
-  notify(): void {
+  notify(): Promise<void> {
     return this.versionUseCase.notify();
   }
 }
diff --git a/src/background/domains/Setting.ts b/src/background/domains/Setting.ts
index 106ec0f..b2b1ff2 100644
--- a/src/background/domains/Setting.ts
+++ b/src/background/domains/Setting.ts
@@ -1,22 +1,30 @@
 import DefaultSettings from '../../shared/settings/default';
 import * as settingsValues from '../../shared/settings/values';
 
+type SettingValue = {
+    source: string,
+    json: string,
+    form: any
+}
+
 export default class Setting {
-  constructor({ source, json, form }) {
+  private obj: SettingValue;
+
+  constructor({ source, json, form }: SettingValue) {
     this.obj = {
       source, json, form
     };
   }
 
-  get source() {
+  get source(): string {
     return this.obj.source;
   }
 
-  get json() {
+  get json(): string {
     return this.obj.json;
   }
 
-  get form() {
+  get form(): any {
     return this.obj.form;
   }
 
@@ -33,11 +41,11 @@ export default class Setting {
     return { ...settingsValues.valueFromJson(DefaultSettings.json), ...value };
   }
 
-  serialize() {
+  serialize(): SettingValue {
     return this.obj;
   }
 
-  static deserialize(obj) {
+  static deserialize(obj: SettingValue): Setting {
     return new Setting({ source: obj.source, json: obj.json, form: obj.form });
   }
 
diff --git a/src/background/infrastructures/ConsoleClient.ts b/src/background/infrastructures/ConsoleClient.ts
index 7ad5d24..c162634 100644
--- a/src/background/infrastructures/ConsoleClient.ts
+++ b/src/background/infrastructures/ConsoleClient.ts
@@ -1,4 +1,4 @@
-import messages from '../../shared/messages';
+import * as messages from '../../shared/messages';
 
 export default class ConsoleClient {
   showCommand(tabId: number, command: string): Promise<any> {
diff --git a/src/background/infrastructures/ContentMessageClient.ts b/src/background/infrastructures/ContentMessageClient.ts
index 20057c7..d4bc476 100644
--- a/src/background/infrastructures/ContentMessageClient.ts
+++ b/src/background/infrastructures/ContentMessageClient.ts
@@ -1,4 +1,4 @@
-import messages from '../../shared/messages';
+import * as messages from '../../shared/messages';
 
 export default class ContentMessageClient {
   async broadcastSettingsChanged(): Promise<void> {
diff --git a/src/background/infrastructures/ContentMessageListener.ts b/src/background/infrastructures/ContentMessageListener.ts
index 81d3232..1cc2696 100644
--- a/src/background/infrastructures/ContentMessageListener.ts
+++ b/src/background/infrastructures/ContentMessageListener.ts
@@ -1,4 +1,4 @@
-import messages from '../../shared/messages';
+import * as messages from '../../shared/messages';
 import CompletionGroup from '../domains/CompletionGroup';
 import CommandController from '../controllers/CommandController';
 import SettingController from '../controllers/SettingController';
@@ -68,7 +68,9 @@ export default class ContentMessageListener {
     browser.runtime.onConnect.addListener(this.onConnected.bind(this));
   }
 
-  onMessage(message: any, senderTab: browser.tabs.Tab): Promise<any> | any {
+  onMessage(
+    message: messages.Message, senderTab: browser.tabs.Tab,
+  ): Promise<any> | any {
     switch (message.type) {
     case messages.CONSOLE_QUERY_COMPLETIONS:
       return this.onConsoleQueryCompletions(message.text);
diff --git a/src/background/presenters/NotifyPresenter.ts b/src/background/presenters/NotifyPresenter.ts
index c83c205..23932f7 100644
--- a/src/background/presenters/NotifyPresenter.ts
+++ b/src/background/presenters/NotifyPresenter.ts
@@ -1,11 +1,11 @@
 const NOTIFICATION_ID = 'vimvixen-update';
 
 export default class NotifyPresenter {
-  notify(
+  async notify(
     title: string,
     message: string,
     onclick: () => void,
-  ): Promise<string> {
+  ): Promise<void> {
     const listener = (id: string) => {
       if (id !== NOTIFICATION_ID) {
         return;
@@ -17,7 +17,7 @@ export default class NotifyPresenter {
     };
     browser.notifications.onClicked.addListener(listener);
 
-    return browser.notifications.create(NOTIFICATION_ID, {
+    await browser.notifications.create(NOTIFICATION_ID, {
       'type': 'basic',
       'iconUrl': browser.extension.getURL('resources/icon_48x48.png'),
       title,
diff --git a/src/background/usecases/VersionUseCase.ts b/src/background/usecases/VersionUseCase.ts
index 207f9e2..3a3cc2e 100644
--- a/src/background/usecases/VersionUseCase.ts
+++ b/src/background/usecases/VersionUseCase.ts
@@ -12,7 +12,7 @@ export default class VersionUseCase {
     this.notifyPresenter = new NotifyPresenter();
   }
 
-  notify(): Promise<string> {
+  notify(): Promise<void> {
     let title = `Vim Vixen ${manifest.version} has been installed`;
     let message = 'Click here to see release notes';
     let url = this.releaseNoteUrl(manifest.version);
diff --git a/src/console/actions/console.ts b/src/console/actions/console.ts
index ceb419c..b1494b0 100644
--- a/src/console/actions/console.ts
+++ b/src/console/actions/console.ts
@@ -1,4 +1,4 @@
-import messages from '../../shared/messages';
+import * as messages from '../../shared/messages';
 import * as actions from './index';
 
 const hide = (): actions.ConsoleAction => {
diff --git a/src/console/index.tsx b/src/console/index.tsx
index ee3a8ee..b655154 100644
--- a/src/console/index.tsx
+++ b/src/console/index.tsx
@@ -1,4 +1,4 @@
-import messages from '../shared/messages';
+import * as messages from '../shared/messages';
 import reducers from './reducers';
 import { createStore, applyMiddleware } from 'redux';
 import promise from 'redux-promise';
@@ -23,15 +23,16 @@ window.addEventListener('load', () => {
 });
 
 const onMessage = (message: any): any => {
-  switch (message.type) {
+  let msg = messages.valueOf(message);
+  switch (msg.type) {
   case messages.CONSOLE_SHOW_COMMAND:
-    return store.dispatch(consoleActions.showCommand(message.command));
+    return store.dispatch(consoleActions.showCommand(msg.command));
   case messages.CONSOLE_SHOW_FIND:
     return store.dispatch(consoleActions.showFind());
   case messages.CONSOLE_SHOW_ERROR:
-    return store.dispatch(consoleActions.showError(message.text));
+    return store.dispatch(consoleActions.showError(msg.text));
   case messages.CONSOLE_SHOW_INFO:
-    return store.dispatch(consoleActions.showInfo(message.text));
+    return store.dispatch(consoleActions.showInfo(msg.text));
   case messages.CONSOLE_HIDE:
     return store.dispatch(consoleActions.hide());
   }
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,
diff --git a/src/shared/messages.ts b/src/shared/messages.ts
index 2bc12d8..41b0f0b 100644
--- a/src/shared/messages.ts
+++ b/src/shared/messages.ts
@@ -1,78 +1,276 @@
-type WebMessageSender = Window | MessagePort | ServiceWorker | null;
-type WebMessageListener = (msg: any, sender: WebMessageSender | null) => void;
-
-const onWebMessage = (listener: WebMessageListener) => {
-  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);
-  });
-};
+import * as operations from './operations';
 
-const onBackgroundMessage = (
-  listener: (msg: any, sender: browser.runtime.MessageSender,
-) => void) => {
-  browser.runtime.onMessage.addListener(listener);
-};
+export const BACKGROUND_OPERATION = 'background.operation';
 
-const onMessage = (
-  listener: (msg: any, sender: WebMessageSender | browser.runtime.MessageSender,
-) => void) => {
-  onWebMessage(listener);
-  onBackgroundMessage(listener);
-};
+export const CONSOLE_UNFOCUS = 'console.unfocus';
+export const CONSOLE_ENTER_COMMAND = 'console.enter.command';
+export const CONSOLE_ENTER_FIND = 'console.enter.find';
+export const CONSOLE_QUERY_COMPLETIONS = 'console.query.completions';
+export const CONSOLE_SHOW_COMMAND = 'console.show.command';
+export const CONSOLE_SHOW_ERROR = 'console.show.error';
+export const CONSOLE_SHOW_INFO = 'console.show.info';
+export const CONSOLE_SHOW_FIND = 'console.show.find';
+export const CONSOLE_HIDE = 'console.hide';
+
+export const FOLLOW_START = 'follow.start';
+export const FOLLOW_REQUEST_COUNT_TARGETS = 'follow.request.count.targets';
+export const FOLLOW_RESPONSE_COUNT_TARGETS = 'follow.response.count.targets';
+export const FOLLOW_CREATE_HINTS = 'follow.create.hints';
+export const FOLLOW_SHOW_HINTS = 'follow.update.hints';
+export const FOLLOW_REMOVE_HINTS = 'follow.remove.hints';
+export const FOLLOW_ACTIVATE = 'follow.activate';
+export const FOLLOW_KEY_PRESS = 'follow.key.press';
+
+export const MARK_SET_GLOBAL = 'mark.set.global';
+export const MARK_JUMP_GLOBAL = 'mark.jump.global';
+
+export const TAB_SCROLL_TO = 'tab.scroll.to';
+
+export const FIND_NEXT = 'find.next';
+export const FIND_PREV = 'find.prev';
+export const FIND_GET_KEYWORD = 'find.get.keyword';
+export const FIND_SET_KEYWORD = 'find.set.keyword';
+
+export const ADDON_ENABLED_QUERY = 'addon.enabled.query';
+export const ADDON_ENABLED_RESPONSE = 'addon.enabled.response';
+export const ADDON_TOGGLE_ENABLED = 'addon.toggle.enabled';
+
+export const OPEN_URL = 'open.url';
+
+export const SETTINGS_CHANGED = 'settings.changed';
+export const SETTINGS_QUERY = 'settings.query';
+
+export const CONSOLE_FRAME_MESSAGE = 'console.frame.message';
+
+interface BackgroundOperationMessage {
+  type: typeof BACKGROUND_OPERATION;
+  operation: operations.Operation;
+}
+
+interface ConsoleUnfocusMessage {
+  type: typeof CONSOLE_UNFOCUS;
+}
+
+interface ConsoleEnterCommandMessage {
+  type: typeof CONSOLE_ENTER_COMMAND;
+  text: string;
+}
+
+interface ConsoleEnterFindMessage {
+  type: typeof CONSOLE_ENTER_FIND;
+  text: string;
+}
+
+interface ConsoleQueryCompletionsMessage {
+  type: typeof CONSOLE_QUERY_COMPLETIONS;
+  text: string;
+}
+
+interface ConsoleShowCommandMessage {
+  type: typeof CONSOLE_SHOW_COMMAND;
+  command: string;
+}
+
+interface ConsoleShowErrorMessage {
+  type: typeof CONSOLE_SHOW_ERROR;
+  text: string;
+}
+
+interface ConsoleShowInfoMessage {
+  type: typeof CONSOLE_SHOW_INFO;
+  text: string;
+}
+
+interface ConsoleShowFindMessage {
+  type: typeof CONSOLE_SHOW_FIND;
+}
+
+interface ConsoleHideMessage {
+  type: typeof CONSOLE_HIDE;
+}
+
+interface FollowStartMessage {
+  type: typeof FOLLOW_START;
+  newTab: boolean;
+  background: boolean;
+}
+
+interface FollowRequestCountTargetsMessage {
+  type: typeof FOLLOW_REQUEST_COUNT_TARGETS;
+  viewSize: { width: number, height: number };
+  framePosition: { x: number, y: number };
+}
+
+interface FollowResponseCountTargetsMessage {
+  type: typeof FOLLOW_RESPONSE_COUNT_TARGETS;
+  count: number;
+}
+
+interface FollowCreateHintsMessage {
+  type: typeof FOLLOW_CREATE_HINTS;
+  keysArray: string[];
+  newTab: boolean;
+  background: boolean;
+}
+
+interface FollowShowHintsMessage {
+  type: typeof FOLLOW_SHOW_HINTS;
+  keys: string;
+}
+
+interface FollowRemoveHintsMessage {
+  type: typeof FOLLOW_REMOVE_HINTS;
+}
+
+interface FollowActivateMessage {
+  type: typeof FOLLOW_ACTIVATE;
+  keys: string;
+}
+
+interface FollowKeyPressMessage {
+  type: typeof FOLLOW_KEY_PRESS;
+  key: string;
+  ctrlKey: boolean;
+}
+
+interface MarkSetGlobalMessage {
+  type: typeof MARK_SET_GLOBAL;
+  key: string;
+  x: number;
+  y: number;
+}
+
+interface MarkJumpGlobalMessage {
+  type: typeof MARK_JUMP_GLOBAL;
+  key: string;
+}
+
+interface TabScrollToMessage {
+  type: typeof TAB_SCROLL_TO;
+  x: number;
+  y: number;
+}
+
+interface FindNextMessage {
+  type: typeof FIND_NEXT;
+}
+
+interface FindPrevMessage {
+  type: typeof FIND_PREV;
+}
+
+interface FindGetKeywordMessage {
+  type: typeof FIND_GET_KEYWORD;
+}
+
+interface FindSetKeywordMessage {
+  type: typeof FIND_SET_KEYWORD;
+  keyword: string;
+  found: boolean;
+}
+
+interface AddonEnabledQueryMessage {
+  type: typeof ADDON_ENABLED_QUERY;
+}
+
+interface AddonEnabledResponseMessage {
+  type: typeof ADDON_ENABLED_RESPONSE;
+  enabled: boolean;
+}
+
+interface AddonToggleEnabledMessage {
+  type: typeof ADDON_TOGGLE_ENABLED;
+}
+
+interface OpenUrlMessage {
+  type: typeof OPEN_URL;
+  url: string;
+  newTab: boolean;
+  background: boolean;
+}
+
+interface SettingsChangedMessage {
+  type: typeof SETTINGS_CHANGED;
+}
+
+interface SettingsQueryMessage {
+  type: typeof SETTINGS_QUERY;
+}
+
+interface ConsoleFrameMessageMessage {
+  type: typeof CONSOLE_FRAME_MESSAGE;
+  message: any;
+}
+
+export type Message =
+  BackgroundOperationMessage |
+  ConsoleUnfocusMessage |
+  ConsoleEnterCommandMessage |
+  ConsoleEnterFindMessage |
+  ConsoleQueryCompletionsMessage |
+  ConsoleShowCommandMessage |
+  ConsoleShowErrorMessage |
+  ConsoleShowInfoMessage |
+  ConsoleShowFindMessage |
+  ConsoleHideMessage |
+  FollowStartMessage |
+  FollowRequestCountTargetsMessage |
+  FollowResponseCountTargetsMessage |
+  FollowCreateHintsMessage |
+  FollowShowHintsMessage |
+  FollowRemoveHintsMessage |
+  FollowActivateMessage |
+  FollowKeyPressMessage |
+  MarkSetGlobalMessage |
+  MarkJumpGlobalMessage |
+  TabScrollToMessage |
+  FindNextMessage |
+  FindPrevMessage |
+  FindGetKeywordMessage |
+  FindSetKeywordMessage |
+  AddonEnabledQueryMessage |
+  AddonEnabledResponseMessage |
+  AddonToggleEnabledMessage |
+  OpenUrlMessage |
+  SettingsChangedMessage |
+  SettingsQueryMessage |
+  ConsoleFrameMessageMessage;
 
-export default {
-  BACKGROUND_OPERATION: 'background.operation',
-
-  CONSOLE_UNFOCUS: 'console.unfocus',
-  CONSOLE_ENTER_COMMAND: 'console.enter.command',
-  CONSOLE_ENTER_FIND: 'console.enter.find',
-  CONSOLE_QUERY_COMPLETIONS: 'console.query.completions',
-  CONSOLE_SHOW_COMMAND: 'console.show.command',
-  CONSOLE_SHOW_ERROR: 'console.show.error',
-  CONSOLE_SHOW_INFO: 'console.show.info',
-  CONSOLE_SHOW_FIND: 'console.show.find',
-  CONSOLE_HIDE: 'console.hide',
-
-  FOLLOW_START: 'follow.start',
-  FOLLOW_REQUEST_COUNT_TARGETS: 'follow.request.count.targets',
-  FOLLOW_RESPONSE_COUNT_TARGETS: 'follow.response.count.targets',
-  FOLLOW_CREATE_HINTS: 'follow.create.hints',
-  FOLLOW_SHOW_HINTS: 'follow.update.hints',
-  FOLLOW_REMOVE_HINTS: 'follow.remove.hints',
-  FOLLOW_ACTIVATE: 'follow.activate',
-  FOLLOW_KEY_PRESS: 'follow.key.press',
-
-  MARK_SET_GLOBAL: 'mark.set.global',
-  MARK_JUMP_GLOBAL: 'mark.jump.global',
-
-  TAB_SCROLL_TO: 'tab.scroll.to',
-
-  FIND_NEXT: 'find.next',
-  FIND_PREV: 'find.prev',
-  FIND_GET_KEYWORD: 'find.get.keyword',
-  FIND_SET_KEYWORD: 'find.set.keyword',
-
-  ADDON_ENABLED_QUERY: 'addon.enabled.query',
-  ADDON_ENABLED_RESPONSE: 'addon.enabled.response',
-  ADDON_TOGGLE_ENABLED: 'addon.toggle.enabled',
-
-  OPEN_URL: 'open.url',
-
-  SETTINGS_CHANGED: 'settings.changed',
-  SETTINGS_QUERY: 'settings.query',
-
-  WINDOW_TOP_MESSAGE: 'window.top.message',
-  CONSOLE_FRAME_MESSAGE: 'console.frame.message',
-
-  onWebMessage,
-  onBackgroundMessage,
-  onMessage,
+// eslint-disable-next-line complexity
+export const valueOf = (o: any): Message => {
+  switch (o.type) {
+  case CONSOLE_UNFOCUS:
+  case CONSOLE_ENTER_COMMAND:
+  case CONSOLE_ENTER_FIND:
+  case CONSOLE_QUERY_COMPLETIONS:
+  case CONSOLE_SHOW_COMMAND:
+  case CONSOLE_SHOW_ERROR:
+  case CONSOLE_SHOW_INFO:
+  case CONSOLE_SHOW_FIND:
+  case CONSOLE_HIDE:
+  case FOLLOW_START:
+  case FOLLOW_REQUEST_COUNT_TARGETS:
+  case FOLLOW_RESPONSE_COUNT_TARGETS:
+  case FOLLOW_CREATE_HINTS:
+  case FOLLOW_SHOW_HINTS:
+  case FOLLOW_REMOVE_HINTS:
+  case FOLLOW_ACTIVATE:
+  case FOLLOW_KEY_PRESS:
+  case MARK_SET_GLOBAL:
+  case MARK_JUMP_GLOBAL:
+  case TAB_SCROLL_TO:
+  case FIND_NEXT:
+  case FIND_PREV:
+  case FIND_GET_KEYWORD:
+  case FIND_SET_KEYWORD:
+  case ADDON_ENABLED_QUERY:
+  case ADDON_ENABLED_RESPONSE:
+  case ADDON_TOGGLE_ENABLED:
+  case OPEN_URL:
+  case SETTINGS_CHANGED:
+  case SETTINGS_QUERY:
+  case CONSOLE_FRAME_MESSAGE:
+    return o;
+  }
+  throw new Error('unknown operation type: ' + o.type);
 };
diff --git a/src/shared/operations.ts b/src/shared/operations.ts
index d59723e..cc22f75 100644
--- a/src/shared/operations.ts
+++ b/src/shared/operations.ts
@@ -1,80 +1,447 @@
-const operations: { [key: string]: string } = {
-  // Hide console, or cancel some user actions
-  CANCEL: 'cancel',
-
-  // Addons
-  ADDON_ENABLE: 'addon.enable',
-  ADDON_DISABLE: 'addon.disable',
-  ADDON_TOGGLE_ENABLED: 'addon.toggle.enabled',
-
-  // Command
-  COMMAND_SHOW: 'command.show',
-  COMMAND_SHOW_OPEN: 'command.show.open',
-  COMMAND_SHOW_TABOPEN: 'command.show.tabopen',
-  COMMAND_SHOW_WINOPEN: 'command.show.winopen',
-  COMMAND_SHOW_BUFFER: 'command.show.buffer',
-  COMMAND_SHOW_ADDBOOKMARK: 'command.show.addbookmark',
-
-  // Scrolls
-  SCROLL_VERTICALLY: 'scroll.vertically',
-  SCROLL_HORIZONALLY: 'scroll.horizonally',
-  SCROLL_PAGES: 'scroll.pages',
-  SCROLL_TOP: 'scroll.top',
-  SCROLL_BOTTOM: 'scroll.bottom',
-  SCROLL_HOME: 'scroll.home',
-  SCROLL_END: 'scroll.end',
-
-  // Follows
-  FOLLOW_START: 'follow.start',
-
-  // Navigations
-  NAVIGATE_HISTORY_PREV: 'navigate.history.prev',
-  NAVIGATE_HISTORY_NEXT: 'navigate.history.next',
-  NAVIGATE_LINK_PREV: 'navigate.link.prev',
-  NAVIGATE_LINK_NEXT: 'navigate.link.next',
-  NAVIGATE_PARENT: 'navigate.parent',
-  NAVIGATE_ROOT: 'navigate.root',
-
-  // Focus
-  FOCUS_INPUT: 'focus.input',
-
-  // Page
-  PAGE_SOURCE: 'page.source',
-  PAGE_HOME: 'page.home',
-
-  // Tabs
-  TAB_CLOSE: 'tabs.close',
-  TAB_CLOSE_FORCE: 'tabs.close.force',
-  TAB_CLOSE_RIGHT: 'tabs.close.right',
-  TAB_REOPEN: 'tabs.reopen',
-  TAB_PREV: 'tabs.prev',
-  TAB_NEXT: 'tabs.next',
-  TAB_FIRST: 'tabs.first',
-  TAB_LAST: 'tabs.last',
-  TAB_PREV_SEL: 'tabs.prevsel',
-  TAB_RELOAD: 'tabs.reload',
-  TAB_PIN: 'tabs.pin',
-  TAB_UNPIN: 'tabs.unpin',
-  TAB_TOGGLE_PINNED: 'tabs.pin.toggle',
-  TAB_DUPLICATE: 'tabs.duplicate',
-
-  // Zooms
-  ZOOM_IN: 'zoom.in',
-  ZOOM_OUT: 'zoom.out',
-  ZOOM_NEUTRAL: 'zoom.neutral',
-
-  // Url yank/paste
-  URLS_YANK: 'urls.yank',
-  URLS_PASTE: 'urls.paste',
-
-  // Find
-  FIND_START: 'find.start',
-  FIND_NEXT: 'find.next',
-  FIND_PREV: 'find.prev',
-
-  // Mark
-  MARK_SET_PREFIX: 'mark.set.prefix',
-  MARK_JUMP_PREFIX: 'mark.jump.prefix',
+// Hide console; or cancel some user actions
+export const CANCEL = 'cancel';
+
+// Addons
+export const ADDON_ENABLE = 'addon.enable';
+export const ADDON_DISABLE = 'addon.disable';
+export const ADDON_TOGGLE_ENABLED = 'addon.toggle.enabled';
+
+// Command
+export const COMMAND_SHOW = 'command.show';
+export const COMMAND_SHOW_OPEN = 'command.show.open';
+export const COMMAND_SHOW_TABOPEN = 'command.show.tabopen';
+export const COMMAND_SHOW_WINOPEN = 'command.show.winopen';
+export const COMMAND_SHOW_BUFFER = 'command.show.buffer';
+export const COMMAND_SHOW_ADDBOOKMARK = 'command.show.addbookmark';
+
+// Scrolls
+export const SCROLL_VERTICALLY = 'scroll.vertically';
+export const SCROLL_HORIZONALLY = 'scroll.horizonally';
+export const SCROLL_PAGES = 'scroll.pages';
+export const SCROLL_TOP = 'scroll.top';
+export const SCROLL_BOTTOM = 'scroll.bottom';
+export const SCROLL_HOME = 'scroll.home';
+export const SCROLL_END = 'scroll.end';
+
+// Follows
+export const FOLLOW_START = 'follow.start';
+
+// Navigations
+export const NAVIGATE_HISTORY_PREV = 'navigate.history.prev';
+export const NAVIGATE_HISTORY_NEXT = 'navigate.history.next';
+export const NAVIGATE_LINK_PREV = 'navigate.link.prev';
+export const NAVIGATE_LINK_NEXT = 'navigate.link.next';
+export const NAVIGATE_PARENT = 'navigate.parent';
+export const NAVIGATE_ROOT = 'navigate.root';
+
+// Focus
+export const FOCUS_INPUT = 'focus.input';
+
+// Page
+export const PAGE_SOURCE = 'page.source';
+export const PAGE_HOME = 'page.home';
+
+// Tabs
+export const TAB_CLOSE = 'tabs.close';
+export const TAB_CLOSE_FORCE = 'tabs.close.force';
+export const TAB_CLOSE_RIGHT = 'tabs.close.right';
+export const TAB_REOPEN = 'tabs.reopen';
+export const TAB_PREV = 'tabs.prev';
+export const TAB_NEXT = 'tabs.next';
+export const TAB_FIRST = 'tabs.first';
+export const TAB_LAST = 'tabs.last';
+export const TAB_PREV_SEL = 'tabs.prevsel';
+export const TAB_RELOAD = 'tabs.reload';
+export const TAB_PIN = 'tabs.pin';
+export const TAB_UNPIN = 'tabs.unpin';
+export const TAB_TOGGLE_PINNED = 'tabs.pin.toggle';
+export const TAB_DUPLICATE = 'tabs.duplicate';
+
+// Zooms
+export const ZOOM_IN = 'zoom.in';
+export const ZOOM_OUT = 'zoom.out';
+export const ZOOM_NEUTRAL = 'zoom.neutral';
+
+// Url yank/paste
+export const URLS_YANK = 'urls.yank';
+export const URLS_PASTE = 'urls.paste';
+
+// Find
+export const FIND_START = 'find.start';
+export const FIND_NEXT = 'find.next';
+export const FIND_PREV = 'find.prev';
+
+// Mark
+export const MARK_SET_PREFIX = 'mark.set.prefix';
+export const MARK_JUMP_PREFIX = 'mark.jump.prefix';
+
+export interface CancelOperation {
+  type: typeof CANCEL;
+}
+
+export interface AddonEnableOperation {
+  type: typeof ADDON_ENABLE;
+}
+
+export interface AddonDisableOperation {
+  type: typeof ADDON_DISABLE;
+}
+
+export interface AddonToggleEnabledOperation {
+  type: typeof ADDON_TOGGLE_ENABLED;
+}
+
+export interface CommandShowOperation {
+  type: typeof COMMAND_SHOW;
+}
+
+export interface CommandShowOpenOperation {
+  type: typeof COMMAND_SHOW_OPEN;
+  alter: boolean;
+}
+
+export interface CommandShowTabopenOperation {
+  type: typeof COMMAND_SHOW_TABOPEN;
+  alter: boolean;
+}
+
+export interface CommandShowWinopenOperation {
+  type: typeof COMMAND_SHOW_WINOPEN;
+  alter: boolean;
+}
+
+export interface CommandShowBufferOperation {
+  type: typeof COMMAND_SHOW_BUFFER;
+}
+
+export interface CommandShowAddbookmarkOperation {
+  type: typeof COMMAND_SHOW_ADDBOOKMARK;
+  alter: boolean;
+}
+
+export interface ScrollVerticallyOperation {
+  type: typeof SCROLL_VERTICALLY;
+  count: number;
+}
+
+export interface ScrollHorizonallyOperation {
+  type: typeof SCROLL_HORIZONALLY;
+  count: number;
+}
+
+export interface ScrollPagesOperation {
+  type: typeof SCROLL_PAGES;
+  count: number;
+}
+
+export interface ScrollTopOperation {
+  type: typeof SCROLL_TOP;
+}
+
+export interface ScrollBottomOperation {
+  type: typeof SCROLL_BOTTOM;
+}
+
+export interface ScrollHomeOperation {
+  type: typeof SCROLL_HOME;
+}
+
+export interface ScrollEndOperation {
+  type: typeof SCROLL_END;
+}
+
+export interface FollowStartOperation {
+  type: typeof FOLLOW_START;
+  newTab: boolean;
+  background: boolean;
+}
+
+export interface NavigateHistoryPrevOperation {
+  type: typeof NAVIGATE_HISTORY_PREV;
+}
+
+export interface NavigateHistoryNextOperation {
+  type: typeof NAVIGATE_HISTORY_NEXT;
+}
+
+export interface NavigateLinkPrevOperation {
+  type: typeof NAVIGATE_LINK_PREV;
+}
+
+export interface NavigateLinkNextOperation {
+  type: typeof NAVIGATE_LINK_NEXT;
+}
+
+export interface NavigateParentOperation {
+  type: typeof NAVIGATE_PARENT;
+}
+
+export interface NavigateRootOperation {
+  type: typeof NAVIGATE_ROOT;
+}
+
+export interface FocusInputOperation {
+  type: typeof FOCUS_INPUT;
+}
+
+export interface PageSourceOperation {
+  type: typeof PAGE_SOURCE;
+}
+
+export interface PageHomeOperation {
+  type: typeof PAGE_HOME;
+  newTab: boolean;
+}
+
+export interface TabCloseOperation {
+  type: typeof TAB_CLOSE;
+}
+
+export interface TabCloseForceOperation {
+  type: typeof TAB_CLOSE_FORCE;
+}
+
+export interface TabCloseRightOperation {
+  type: typeof TAB_CLOSE_RIGHT;
+}
+
+export interface TabReopenOperation {
+  type: typeof TAB_REOPEN;
+}
+
+export interface TabPrevOperation {
+  type: typeof TAB_PREV;
+}
+
+export interface TabNextOperation {
+  type: typeof TAB_NEXT;
+}
+
+export interface TabFirstOperation {
+  type: typeof TAB_FIRST;
+}
+
+export interface TabLastOperation {
+  type: typeof TAB_LAST;
+}
+
+export interface TabPrevSelOperation {
+  type: typeof TAB_PREV_SEL;
+}
+
+export interface TabReloadOperation {
+  type: typeof TAB_RELOAD;
+  cache: boolean;
+}
+
+export interface TabPinOperation {
+  type: typeof TAB_PIN;
+}
+
+export interface TabUnpinOperation {
+  type: typeof TAB_UNPIN;
+}
+
+export interface TabTogglePinnedOperation {
+  type: typeof TAB_TOGGLE_PINNED;
+}
+
+export interface TabDuplicateOperation {
+  type: typeof TAB_DUPLICATE;
+}
+
+export interface ZoomInOperation {
+  type: typeof ZOOM_IN;
+}
+
+export interface ZoomOutOperation {
+  type: typeof ZOOM_OUT;
+}
+
+export interface ZoomNeutralOperation {
+  type: typeof ZOOM_NEUTRAL;
+}
+
+export interface UrlsYankOperation {
+  type: typeof URLS_YANK;
+}
+
+export interface UrlsPasteOperation {
+  type: typeof URLS_PASTE;
+  newTab: boolean;
+}
+
+export interface FindStartOperation {
+  type: typeof FIND_START;
+}
+
+export interface FindNextOperation {
+  type: typeof FIND_NEXT;
+}
+
+export interface FindPrevOperation {
+  type: typeof FIND_PREV;
+}
+
+export interface MarkSetPrefixOperation {
+  type: typeof MARK_SET_PREFIX;
+}
+
+export interface MarkJumpPrefixOperation {
+  type: typeof MARK_JUMP_PREFIX;
+}
+
+export type Operation =
+  CancelOperation |
+  AddonEnableOperation |
+  AddonDisableOperation |
+  AddonToggleEnabledOperation |
+  CommandShowOperation |
+  CommandShowOpenOperation |
+  CommandShowTabopenOperation |
+  CommandShowWinopenOperation |
+  CommandShowBufferOperation |
+  CommandShowAddbookmarkOperation |
+  ScrollVerticallyOperation |
+  ScrollHorizonallyOperation |
+  ScrollPagesOperation |
+  ScrollTopOperation |
+  ScrollBottomOperation |
+  ScrollHomeOperation |
+  ScrollEndOperation |
+  FollowStartOperation |
+  NavigateHistoryPrevOperation |
+  NavigateHistoryNextOperation |
+  NavigateLinkPrevOperation |
+  NavigateLinkNextOperation |
+  NavigateParentOperation |
+  NavigateRootOperation |
+  FocusInputOperation |
+  PageSourceOperation |
+  PageHomeOperation |
+  TabCloseOperation |
+  TabCloseForceOperation |
+  TabCloseRightOperation |
+  TabReopenOperation |
+  TabPrevOperation |
+  TabNextOperation |
+  TabFirstOperation |
+  TabLastOperation |
+  TabPrevSelOperation |
+  TabReloadOperation |
+  TabPinOperation |
+  TabUnpinOperation |
+  TabTogglePinnedOperation |
+  TabDuplicateOperation |
+  ZoomInOperation |
+  ZoomOutOperation |
+  ZoomNeutralOperation |
+  UrlsYankOperation |
+  UrlsPasteOperation |
+  FindStartOperation |
+  FindNextOperation |
+  FindPrevOperation |
+  MarkSetPrefixOperation |
+  MarkJumpPrefixOperation;
+
+const assertOptionalBoolean = (obj: any, name: string) => {
+  if (Object.prototype.hasOwnProperty.call(obj, name) &&
+      typeof obj[name] !== 'boolean') {
+    throw new TypeError(`Not a boolean parameter '${name}'`);
+  }
+};
+
+const assertRequiredNumber = (obj: any, name: string) => {
+  if (!Object.prototype.hasOwnProperty.call(obj, name) ||
+    typeof obj[name] !== 'number') {
+    throw new TypeError(`Missing number parameter '${name}`);
+  }
 };
 
-export default operations;
+// eslint-disable-next-line complexity, max-lines-per-function
+export const valueOf = (o: any): Operation => {
+  if (!Object.prototype.hasOwnProperty.call(o, 'type')) {
+    throw new TypeError(`missing 'type' field`);
+  }
+  switch (o.type) {
+  case COMMAND_SHOW_OPEN:
+  case COMMAND_SHOW_TABOPEN:
+  case COMMAND_SHOW_WINOPEN:
+  case COMMAND_SHOW_ADDBOOKMARK:
+    assertOptionalBoolean(o, 'alter');
+    return { type: o.type, alter: Boolean(o.alter) };
+  case SCROLL_VERTICALLY:
+  case SCROLL_HORIZONALLY:
+  case SCROLL_PAGES:
+    assertRequiredNumber(o, 'count');
+    return { type: o.type, count: Number(o.count) };
+  case FOLLOW_START:
+    assertOptionalBoolean(o, 'newTab');
+    assertOptionalBoolean(o, 'background');
+    return {
+      type: FOLLOW_START,
+      newTab: Boolean(typeof o.newTab === undefined ? false : o.newTab),
+      background: Boolean(typeof o.background === undefined ? true : o.background), // eslint-disable-line max-len
+    };
+  case PAGE_HOME:
+    assertOptionalBoolean(o, 'newTab');
+    return {
+      type: PAGE_HOME,
+      newTab: Boolean(typeof o.newTab === undefined ? false : o.newTab),
+    };
+  case TAB_RELOAD:
+    assertOptionalBoolean(o, 'cache');
+    return {
+      type: TAB_RELOAD,
+      cache: Boolean(typeof o.cache === undefined ? false : o.cache),
+    };
+  case URLS_PASTE:
+    assertOptionalBoolean(o, 'newTab');
+    return {
+      type: URLS_PASTE,
+      newTab: Boolean(typeof o.newTab === undefined ? false : o.newTab),
+    };
+  case CANCEL:
+  case ADDON_ENABLE:
+  case ADDON_DISABLE:
+  case ADDON_TOGGLE_ENABLED:
+  case COMMAND_SHOW:
+  case COMMAND_SHOW_BUFFER:
+  case SCROLL_TOP:
+  case SCROLL_BOTTOM:
+  case SCROLL_HOME:
+  case SCROLL_END:
+  case NAVIGATE_HISTORY_PREV:
+  case NAVIGATE_HISTORY_NEXT:
+  case NAVIGATE_LINK_PREV:
+  case NAVIGATE_LINK_NEXT:
+  case NAVIGATE_PARENT:
+  case NAVIGATE_ROOT:
+  case FOCUS_INPUT:
+  case PAGE_SOURCE:
+  case TAB_CLOSE:
+  case TAB_CLOSE_FORCE:
+  case TAB_CLOSE_RIGHT:
+  case TAB_REOPEN:
+  case TAB_PREV:
+  case TAB_NEXT:
+  case TAB_FIRST:
+  case TAB_LAST:
+  case TAB_PREV_SEL:
+  case TAB_PIN:
+  case TAB_UNPIN:
+  case TAB_TOGGLE_PINNED:
+  case TAB_DUPLICATE:
+  case ZOOM_IN:
+  case ZOOM_OUT:
+  case ZOOM_NEUTRAL:
+  case URLS_YANK:
+  case FIND_START:
+  case FIND_NEXT:
+  case FIND_PREV:
+  case MARK_SET_PREFIX:
+  case MARK_JUMP_PREFIX:
+    return { type: o.type };
+  }
+  throw new Error('unknown operation type: ' + o.type);
+};
diff --git a/src/shared/settings/validator.ts b/src/shared/settings/validator.ts
index 0483931..71cc466 100644
--- a/src/shared/settings/validator.ts
+++ b/src/shared/settings/validator.ts
@@ -1,4 +1,4 @@
-import operations from '../operations';
+import * as operations from '../operations';
 import * as properties from './properties';
 
 const VALID_TOP_KEYS = ['keymaps', 'search', 'blacklist', 'properties'];
diff --git a/src/shared/utils/keys.ts b/src/shared/utils/keys.ts
index d9abef7..e9b0365 100644
--- a/src/shared/utils/keys.ts
+++ b/src/shared/utils/keys.ts
@@ -1,4 +1,4 @@
-interface Key {
+export interface Key {
     key: string;
     shiftKey: boolean | undefined;
     ctrlKey: boolean | undefined;