diff --git a/packages/redux-devtools-core/src/app/actions/index.ts b/packages/redux-devtools-core/src/app/actions/index.ts
index 973905f3..ab06015c 100644
--- a/packages/redux-devtools-core/src/app/actions/index.ts
+++ b/packages/redux-devtools-core/src/app/actions/index.ts
@@ -19,6 +19,7 @@ import {
   UPDATE_STATE,
   UPDATE_REPORTS,
   REMOVE_INSTANCE,
+  SET_STATE,
 } from '../constants/actionTypes';
 import {
   AUTH_ERROR,
@@ -37,6 +38,9 @@ import {
   UNSUBSCRIBE,
 } from '../constants/socketActionTypes';
 import { Action } from 'redux';
+import { Features, State } from '../reducers/instances';
+import { MonitorStateMonitorState } from '../reducers/monitor';
+import { LiftedAction } from 'redux-devtools-instrument';
 
 let monitorReducer: (
   monitorProps: unknown,
@@ -91,10 +95,33 @@ export interface MonitorActionAction {
   ) => unknown;
   monitorProps: unknown;
 }
-interface LiftedActionDispatchAction {
+interface JumpToStateAction {
+  type: 'JUMP_TO_STATE';
+  index: number;
+  actionId: number;
+}
+interface JumpToActionAction {
+  type: 'JUMP_TO_ACTION';
+  index: number;
+  actionId: number;
+}
+interface PauseRecordingAction {
+  type: 'PAUSE_RECORDING';
+  status: boolean;
+}
+interface LockChangesAction {
+  type: 'LOCK_CHANGES';
+  status: boolean;
+}
+export interface LiftedActionDispatchAction {
   type: typeof LIFTED_ACTION;
   message: 'DISPATCH';
-  action: Action<unknown>;
+  action:
+    | JumpToStateAction
+    | JumpToActionAction
+    | PauseRecordingAction
+    | LockChangesAction;
+  toAll?: boolean;
 }
 interface LiftedActionImportAction {
   type: typeof LIFTED_ACTION;
@@ -102,18 +129,39 @@ interface LiftedActionImportAction {
   state: string;
   preloadedState: unknown | undefined;
 }
-export type LiftedActionAction = LiftedActionDispatchAction;
+interface LiftedActionActionAction {
+  type: typeof LIFTED_ACTION;
+  message: 'ACTION';
+  action: Action<unknown>;
+}
+export type LiftedActionAction =
+  | LiftedActionDispatchAction
+  | LiftedActionImportAction
+  | LiftedActionActionAction;
 export function liftedDispatch(
-  action: InitMonitorAction
+  action:
+    | InitMonitorAction
+    | JumpToStateAction
+    | JumpToActionAction
+    | LiftedAction<unknown, Action<unknown>, unknown>
 ): MonitorActionAction | LiftedActionDispatchAction {
   if (action.type[0] === '@') {
     if (action.type === '@@INIT_MONITOR') {
       monitorReducer = action.update;
       monitorProps = action.monitorProps;
     }
-    return { type: MONITOR_ACTION, action, monitorReducer, monitorProps };
+    return {
+      type: MONITOR_ACTION,
+      action,
+      monitorReducer,
+      monitorProps,
+    } as MonitorActionAction;
   }
-  return { type: LIFTED_ACTION, message: 'DISPATCH', action };
+  return {
+    type: LIFTED_ACTION,
+    message: 'DISPATCH',
+    action,
+  } as LiftedActionDispatchAction;
 }
 
 interface SelectInstanceAction {
@@ -127,20 +175,21 @@ export function selectInstance(selected: string): SelectInstanceAction {
 interface SelectMonitorAction {
   type: typeof SELECT_MONITOR;
   monitor: string;
-  monitorState?: unknown;
+  monitorState?: MonitorStateMonitorState;
 }
 export function selectMonitor(monitor: string): SelectMonitorAction {
   return { type: SELECT_MONITOR, monitor };
 }
 export function selectMonitorWithState(
   value: string,
-  monitorState: unknown
+  monitorState: MonitorStateMonitorState
 ): SelectMonitorAction {
   return { type: SELECT_MONITOR, monitor: value, monitorState };
 }
 
 interface NextState {
   subTabName: string;
+  inspectedStatePath?: string[];
 }
 interface UpdateMonitorStateAction {
   type: typeof UPDATE_MONITOR_STATE;
@@ -150,7 +199,9 @@ export function selectMonitorTab(subTabName: string): UpdateMonitorStateAction {
   return { type: UPDATE_MONITOR_STATE, nextState: { subTabName } };
 }
 
-export function updateMonitorState(nextState) {
+export function updateMonitorState(
+  nextState: NextState
+): UpdateMonitorStateAction {
   return { type: UPDATE_MONITOR_STATE, nextState };
 }
 
@@ -168,7 +219,7 @@ export function exportState(): ExportAction {
   return { type: EXPORT };
 }
 
-export function lockChanges(status) {
+export function lockChanges(status: boolean): LiftedActionDispatchAction {
   return {
     type: LIFTED_ACTION,
     message: 'DISPATCH',
@@ -177,7 +228,7 @@ export function lockChanges(status) {
   };
 }
 
-export function pauseRecording(status) {
+export function pauseRecording(status: boolean): LiftedActionDispatchAction {
   return {
     type: LIFTED_ACTION,
     message: 'DISPATCH',
@@ -186,7 +237,9 @@ export function pauseRecording(status) {
   };
 }
 
-export function dispatchRemotely(action) {
+export function dispatchRemotely(
+  action: Action<unknown>
+): LiftedActionActionAction {
   return { type: LIFTED_ACTION, message: 'ACTION', action };
 }
 
@@ -254,12 +307,67 @@ export function clearNotification(): ClearNotificationAction {
   return { type: CLEAR_NOTIFICATION };
 }
 
-export function getReport(report) {
+interface GetReportRequest {
+  readonly type: typeof GET_REPORT_REQUEST;
+  readonly report: unknown;
+}
+export function getReport(report: unknown): GetReportRequest {
   return { type: GET_REPORT_REQUEST, report };
 }
 
+interface LibConfig {
+  actionCreators?: string;
+  name?: string;
+  type?: string;
+  features?: Features;
+  serialize?: boolean;
+}
+
+export interface RequestBase {
+  id: string;
+  instanceId?: string;
+  action?: string;
+  name?: string;
+  libConfig?: LibConfig;
+  actionsById?: string;
+  computedStates?: string;
+  // eslint-disable-next-line @typescript-eslint/ban-types
+  payload?: {} | string;
+}
+interface InitRequest extends RequestBase {
+  type: 'INIT';
+  action: string;
+}
+interface ActionRequest extends RequestBase {
+  type: 'ACTION';
+}
+interface StateRequest extends RequestBase {
+  type: 'STATE';
+  committedState: unknown;
+}
+interface PartialStateRequest extends RequestBase {
+  type: 'PARTIAL_STATE';
+  committedState: unknown;
+}
+interface LiftedRequest extends RequestBase {
+  type: 'LIFTED';
+}
+export type Request =
+  | InitRequest
+  | ActionRequest
+  | StateRequest
+  | PartialStateRequest
+  | LiftedRequest;
+
 interface UpdateStateAction {
   type: typeof UPDATE_STATE;
+  request?: Request;
+  id?: string;
+}
+
+interface SetStateAction {
+  type: typeof SET_STATE;
+  newState: State;
 }
 
 interface RemoveInstanceAction {
@@ -355,6 +463,8 @@ export type StoreAction =
   | ReconnectAction
   | ShowNotificationAction
   | ClearNotificationAction
+  | GetReportRequest
+  | SetStateAction
   | UpdateStateAction
   | RemoveInstanceAction
   | ConnectRequestAction
diff --git a/packages/redux-devtools-core/src/app/components/BottomButtons.tsx b/packages/redux-devtools-core/src/app/components/BottomButtons.tsx
index 96dd6c2a..da8788a9 100644
--- a/packages/redux-devtools-core/src/app/components/BottomButtons.tsx
+++ b/packages/redux-devtools-core/src/app/components/BottomButtons.tsx
@@ -8,10 +8,12 @@ import PrintButton from './buttons/PrintButton';
 import DispatcherButton from './buttons/DispatcherButton';
 import SliderButton from './buttons/SliderButton';
 import MonitorSelector from './MonitorSelector';
+import { Options } from '../reducers/instances';
 
 interface Props {
   dispatcherIsOpen: boolean;
   sliderIsOpen: boolean;
+  options: Options;
 }
 
 export default class BottomButtons extends Component<Props> {
diff --git a/packages/redux-devtools-core/src/app/components/TopButtons.tsx b/packages/redux-devtools-core/src/app/components/TopButtons.tsx
index ddd0acde..e183742a 100644
--- a/packages/redux-devtools-core/src/app/components/TopButtons.tsx
+++ b/packages/redux-devtools-core/src/app/components/TopButtons.tsx
@@ -2,18 +2,21 @@ import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import { ActionCreators, LiftedAction } from 'redux-devtools-instrument';
 import { Button, Toolbar, Divider } from 'devui';
+import { Action } from 'redux';
 import RecordButton from './buttons/RecordButton';
 import PersistButton from './buttons/PersistButton';
 import LockButton from './buttons/LockButton';
 import InstanceSelector from './InstanceSelector';
 import SyncButton from './buttons/SyncButton';
-import { Action } from 'redux';
+import { Options, State } from '../reducers/instances';
 
 // eslint-disable-next-line @typescript-eslint/unbound-method
 const { reset, rollback, commit, sweep } = ActionCreators;
 
 interface Props {
   dispatch: (action: LiftedAction<unknown, Action<unknown>, unknown>) => void;
+  liftedState: State;
+  options: Options;
 }
 
 export default class TopButtons extends Component<Props> {
diff --git a/packages/redux-devtools-core/src/app/components/buttons/LockButton.tsx b/packages/redux-devtools-core/src/app/components/buttons/LockButton.tsx
index c75e5f27..bf338f68 100644
--- a/packages/redux-devtools-core/src/app/components/buttons/LockButton.tsx
+++ b/packages/redux-devtools-core/src/app/components/buttons/LockButton.tsx
@@ -1,19 +1,19 @@
 import React, { Component } from 'react';
-import PropTypes from 'prop-types';
 import { connect } from 'react-redux';
 import { Button } from 'devui';
 import { IoIosLock } from 'react-icons/io';
 import { lockChanges, StoreAction } from '../../actions';
 import { Dispatch } from 'redux';
 
-class LockButton extends Component {
-  static propTypes = {
-    locked: PropTypes.bool,
-    disabled: PropTypes.bool,
-    lockChanges: PropTypes.func.isRequired,
-  };
+type DispatchProps = ReturnType<typeof mapDispatchToProps>;
+interface OwnProps {
+  locked: boolean | undefined;
+  disabled: boolean;
+}
+type Props = DispatchProps & OwnProps;
 
-  shouldComponentUpdate(nextProps) {
+class LockButton extends Component<Props> {
+  shouldComponentUpdate(nextProps: Props) {
     return nextProps.locked !== this.props.locked;
   }
 
diff --git a/packages/redux-devtools-core/src/app/components/buttons/PersistButton.tsx b/packages/redux-devtools-core/src/app/components/buttons/PersistButton.tsx
index e928ffac..7ae77e47 100644
--- a/packages/redux-devtools-core/src/app/components/buttons/PersistButton.tsx
+++ b/packages/redux-devtools-core/src/app/components/buttons/PersistButton.tsx
@@ -8,15 +8,12 @@ import { StoreState } from '../../reducers';
 
 type StateProps = ReturnType<typeof mapStateToProps>;
 type DispatchProps = ResolveThunks<typeof actionCreators>;
-type Props = StateProps & DispatchProps;
+interface OwnProps {
+  disabled?: boolean;
+}
+type Props = StateProps & DispatchProps & OwnProps;
 
 class LockButton extends Component<Props> {
-  static propTypes = {
-    persisted: PropTypes.bool,
-    disabled: PropTypes.bool,
-    onClick: PropTypes.func.isRequired,
-  };
-
   shouldComponentUpdate(nextProps: Props) {
     return nextProps.persisted !== this.props.persisted;
   }
diff --git a/packages/redux-devtools-core/src/app/components/buttons/RecordButton.tsx b/packages/redux-devtools-core/src/app/components/buttons/RecordButton.tsx
index a6a108dc..b120bb04 100644
--- a/packages/redux-devtools-core/src/app/components/buttons/RecordButton.tsx
+++ b/packages/redux-devtools-core/src/app/components/buttons/RecordButton.tsx
@@ -1,17 +1,18 @@
 import React, { Component } from 'react';
-import PropTypes from 'prop-types';
 import { connect } from 'react-redux';
 import { Button } from 'devui';
 import { MdFiberManualRecord } from 'react-icons/md';
-import { pauseRecording } from '../../actions';
+import { pauseRecording, StoreAction } from '../../actions';
+import { Dispatch } from 'redux';
 
-class RecordButton extends Component {
-  static propTypes = {
-    paused: PropTypes.bool,
-    pauseRecording: PropTypes.func.isRequired,
-  };
+type DispatchProps = ReturnType<typeof mapDispatchToProps>;
+interface OwnProps {
+  paused: boolean | undefined;
+}
+type Props = DispatchProps & OwnProps;
 
-  shouldComponentUpdate(nextProps) {
+class RecordButton extends Component<Props> {
+  shouldComponentUpdate(nextProps: Props) {
     return nextProps.paused !== this.props.paused;
   }
 
@@ -29,7 +30,10 @@ class RecordButton extends Component {
   }
 }
 
-function mapDispatchToProps(dispatch, ownProps) {
+function mapDispatchToProps(
+  dispatch: Dispatch<StoreAction>,
+  ownProps: OwnProps
+) {
   return {
     pauseRecording: () => dispatch(pauseRecording(!ownProps.paused)),
   };
diff --git a/packages/redux-devtools-core/src/app/components/buttons/SyncButton.tsx b/packages/redux-devtools-core/src/app/components/buttons/SyncButton.tsx
index 406c9c2b..5c8a8e4d 100644
--- a/packages/redux-devtools-core/src/app/components/buttons/SyncButton.tsx
+++ b/packages/redux-devtools-core/src/app/components/buttons/SyncButton.tsx
@@ -1,5 +1,4 @@
 import React, { Component } from 'react';
-import PropTypes from 'prop-types';
 import { connect, ResolveThunks } from 'react-redux';
 import { Button } from 'devui';
 import { TiArrowSync } from 'react-icons/ti';
@@ -11,11 +10,6 @@ type DispatchProps = ResolveThunks<typeof actionCreators>;
 type Props = StateProps & DispatchProps;
 
 class SyncButton extends Component<Props> {
-  static propTypes = {
-    sync: PropTypes.bool,
-    onClick: PropTypes.func.isRequired,
-  };
-
   shouldComponentUpdate(nextProps: Props) {
     return nextProps.sync !== this.props.sync;
   }
diff --git a/packages/redux-devtools-core/src/app/containers/DevTools.tsx b/packages/redux-devtools-core/src/app/containers/DevTools.tsx
index 96ef7868..dad48085 100644
--- a/packages/redux-devtools-core/src/app/containers/DevTools.tsx
+++ b/packages/redux-devtools-core/src/app/containers/DevTools.tsx
@@ -1,17 +1,23 @@
 import React, { Component } from 'react';
-import PropTypes from 'prop-types';
 import { withTheme } from 'styled-components';
 import { LiftedAction, LiftedState } from 'redux-devtools-instrument';
 import { Action } from 'redux';
 import { Monitor } from 'redux-devtools';
 import getMonitor from '../utils/getMonitor';
 import { InitMonitorAction } from '../actions';
+import { Features, State } from '../reducers/instances';
+import { MonitorStateMonitorState } from '../reducers/monitor';
+import { ThemeFromProvider } from 'devui';
 
 interface Props {
   monitor: string;
+  liftedState: State;
+  monitorState: MonitorStateMonitorState | undefined;
   dispatch: (
     action: LiftedAction<unknown, Action<unknown>, unknown> | InitMonitorAction
   ) => void;
+  features: Features | undefined;
+  theme: ThemeFromProvider;
 }
 
 class DevTools extends Component<Props> {
@@ -30,7 +36,7 @@ class DevTools extends Component<Props> {
     this.getMonitor(props, props.monitorState);
   }
 
-  getMonitor(props: Props, skipUpdate: unknown) {
+  getMonitor(props: Props, skipUpdate?: unknown) {
     const monitorElement = getMonitor(props);
     this.monitorProps = monitorElement.props;
     this.Monitor = monitorElement.type;
@@ -59,15 +65,15 @@ class DevTools extends Component<Props> {
     }
   }
 
-  UNSAFE_componentWillUpdate(nextProps) {
+  UNSAFE_componentWillUpdate(nextProps: Props) {
     if (nextProps.monitor !== this.props.monitor) this.getMonitor(nextProps);
   }
 
-  shouldComponentUpdate(nextProps) {
+  shouldComponentUpdate(nextProps: Props) {
     return (
       nextProps.monitor !== this.props.monitor ||
       nextProps.liftedState !== this.props.liftedState ||
-      nextProps.monitorState !== this.props.liftedState ||
+      nextProps.monitorState !== this.props.monitorState ||
       nextProps.features !== this.props.features ||
       nextProps.theme.scheme !== this.props.theme.scheme
     );
@@ -103,13 +109,4 @@ class DevTools extends Component<Props> {
   }
 }
 
-DevTools.propTypes = {
-  liftedState: PropTypes.object,
-  monitorState: PropTypes.object,
-  dispatch: PropTypes.func.isRequired,
-  monitor: PropTypes.string,
-  features: PropTypes.object.isRequired,
-  theme: PropTypes.object.isRequired,
-};
-
 export default withTheme(DevTools);
diff --git a/packages/redux-devtools-core/src/app/containers/monitors/ChartMonitorWrapper.tsx b/packages/redux-devtools-core/src/app/containers/monitors/ChartMonitorWrapper.tsx
index 9031db7b..8c16e0e8 100644
--- a/packages/redux-devtools-core/src/app/containers/monitors/ChartMonitorWrapper.tsx
+++ b/packages/redux-devtools-core/src/app/containers/monitors/ChartMonitorWrapper.tsx
@@ -9,7 +9,7 @@ export function getPath(obj: NodeWithId, inspectedStatePath: string[]) {
   if (!parent) return;
   getPath(parent, inspectedStatePath);
   let name = obj.name;
-  const item = name.match(/.+\[(\d+)]/);
+  const item = /.+\[(\d+)]/.exec(name);
   if (item) name = item[1];
   inspectedStatePath.push(name);
 }
diff --git a/packages/redux-devtools-core/src/app/containers/monitors/Dispatcher.tsx b/packages/redux-devtools-core/src/app/containers/monitors/Dispatcher.tsx
index 7c0b1584..a8a4bb10 100644
--- a/packages/redux-devtools-core/src/app/containers/monitors/Dispatcher.tsx
+++ b/packages/redux-devtools-core/src/app/containers/monitors/Dispatcher.tsx
@@ -1,11 +1,11 @@
 // Based on https://github.com/YoruNoHikage/redux-devtools-dispatch
 
 import React, { Component } from 'react';
-import PropTypes from 'prop-types';
 import styled from 'styled-components';
 import { Button, Select, Editor, Toolbar } from 'devui';
 import { connect, ResolveThunks } from 'react-redux';
 import { dispatchRemotely } from '../../actions';
+import { Options } from '../../reducers/instances';
 
 export const DispatcherContainer = styled.div`
   display: flex;
@@ -47,14 +47,20 @@ export const ActionContainer = styled.div`
 `;
 
 type DispatchProps = ResolveThunks<typeof actionCreators>;
-type Props = DispatchProps;
+interface OwnProps {
+  options: Options;
+}
+type Props = DispatchProps & OwnProps;
 
-class Dispatcher extends Component<Props> {
-  static propTypes = {
-    options: PropTypes.object.isRequired,
-    dispatch: PropTypes.func.isRequired,
-  };
+interface State {
+  selected: string;
+  customAction: string;
+  args: unknown[];
+  rest: string;
+  changed: boolean;
+}
 
+class Dispatcher extends Component<Props, State> {
   state = {
     selected: 'default',
     customAction:
@@ -64,7 +70,7 @@ class Dispatcher extends Component<Props> {
     changed: false,
   };
 
-  UNSAFE_componentWillReceiveProps(nextProps) {
+  UNSAFE_componentWillReceiveProps(nextProps: Props) {
     if (
       this.state.selected !== 'default' &&
       !nextProps.options.actionCreators
@@ -76,7 +82,7 @@ class Dispatcher extends Component<Props> {
     }
   }
 
-  shouldComponentUpdate(nextProps, nextState) {
+  shouldComponentUpdate(nextProps: Props, nextState: State) {
     return (
       nextState !== this.state ||
       nextProps.options.actionCreators !== this.props.options.actionCreators
@@ -94,7 +100,7 @@ class Dispatcher extends Component<Props> {
 
     const args = [];
     if (selected !== 'default') {
-      args.length = this.props.options.actionCreators[selected].args.length;
+      args.length = this.props.options.actionCreators![selected].args.length;
     }
     this.setState({ selected, args, rest: '[]', changed: false });
   };
diff --git a/packages/redux-devtools-core/src/app/containers/monitors/InspectorWrapper/SubTabs.tsx b/packages/redux-devtools-core/src/app/containers/monitors/InspectorWrapper/SubTabs.tsx
index 8a9e7b68..00d97ffa 100644
--- a/packages/redux-devtools-core/src/app/containers/monitors/InspectorWrapper/SubTabs.tsx
+++ b/packages/redux-devtools-core/src/app/containers/monitors/InspectorWrapper/SubTabs.tsx
@@ -1,5 +1,4 @@
 import React, { Component } from 'react';
-import PropTypes from 'prop-types';
 import { connect, ResolveThunks } from 'react-redux';
 import { Tab, Tabs } from 'devui';
 import { TabComponentProps } from 'redux-devtools-inspector-monitor';
@@ -97,18 +96,9 @@ class SubTabs extends Component<Props> {
   }
 }
 
-SubTabs.propTypes = {
-  selected: PropTypes.string,
-  parentTab: PropTypes.string,
-  selectMonitorTab: PropTypes.func.isRequired,
-  action: PropTypes.object,
-  delta: PropTypes.object,
-  nextState: PropTypes.object,
-};
-
 const mapStateToProps = (state: StoreState) => ({
-  parentTab: state.monitor.monitorState.tabName,
-  selected: state.monitor.monitorState.subTabName,
+  parentTab: state.monitor.monitorState!.tabName,
+  selected: state.monitor.monitorState!.subTabName,
 });
 
 const actionCreators = {
diff --git a/packages/redux-devtools-core/src/app/middlewares/exportState.ts b/packages/redux-devtools-core/src/app/middlewares/exportState.ts
index d0609022..9d0eab21 100644
--- a/packages/redux-devtools-core/src/app/middlewares/exportState.ts
+++ b/packages/redux-devtools-core/src/app/middlewares/exportState.ts
@@ -8,7 +8,7 @@ function download(state) {
   const blob = new Blob([state], { type: 'octet/stream' });
   const href = window.URL.createObjectURL(blob);
   const a = document.createElement('a');
-  a.style = 'display: none';
+  a.style.display = 'none';
   a.download = 'state.json';
   a.href = href;
   document.body.appendChild(a);
diff --git a/packages/redux-devtools-core/src/app/reducers/instances.ts b/packages/redux-devtools-core/src/app/reducers/instances.ts
index 3a9347f9..bb29e0f2 100644
--- a/packages/redux-devtools-core/src/app/reducers/instances.ts
+++ b/packages/redux-devtools-core/src/app/reducers/instances.ts
@@ -12,12 +12,12 @@ import {
 import { DISCONNECTED } from '../constants/socketActionTypes';
 import parseJSON from '../utils/parseJSON';
 import { recompute } from '../utils/updateState';
-import { LiftedActionAction, StoreAction } from '../actions';
+import { LiftedActionDispatchAction, Request, StoreAction } from '../actions';
 
-interface Features {
+export interface Features {
   lock?: boolean;
-  export?: boolean;
-  import?: string;
+  export?: string | boolean;
+  import?: string | boolean;
   persist?: boolean;
   pause?: boolean;
   reorder?: boolean;
@@ -28,7 +28,7 @@ interface Features {
   test?: boolean;
 }
 
-interface Options {
+export interface Options {
   name?: string;
   connectionId?: string;
   explicitLib?: string;
@@ -38,13 +38,16 @@ interface Options {
   serialize?: boolean;
 }
 
-interface State {
+export interface State {
   actionsById: { [actionId: number]: PerformAction<Action<unknown>> };
   computedStates: { state: unknown; error?: string }[];
   currentStateIndex: number;
   nextActionId: number;
   skippedActionIds: number[];
   stagedActionIds: number[];
+  committedState?: unknown;
+  isLocked?: boolean;
+  isPaused?: boolean;
 }
 
 export interface InstancesState {
@@ -77,7 +80,7 @@ export const initialState: InstancesState = {
 
 function updateState(
   state: { [id: string]: State },
-  request,
+  request: Request,
   id: string,
   serialize: boolean | undefined
 ) {
@@ -201,7 +204,7 @@ function updateState(
 
 export function dispatchAction(
   state: InstancesState,
-  { action }: LiftedActionAction
+  { action }: LiftedActionDispatchAction
 ) {
   if (action.type === 'JUMP_TO_STATE' || action.type === 'JUMP_TO_ACTION') {
     const id = state.selected || state.current;
@@ -256,7 +259,11 @@ function removeState(state: InstancesState, connectionId: string) {
   };
 }
 
-function init({ type, action, name, libConfig = {} }, connectionId, current) {
+function init(
+  { type, action, name, libConfig = {} }: Request,
+  connectionId: string,
+  current: string
+): Options {
   let lib;
   let actionCreators;
   let creators = libConfig.actionCreators || action;
diff --git a/packages/redux-devtools-core/src/app/reducers/monitor.ts b/packages/redux-devtools-core/src/app/reducers/monitor.ts
index 2ec84a61..ff9c68cf 100644
--- a/packages/redux-devtools-core/src/app/reducers/monitor.ts
+++ b/packages/redux-devtools-core/src/app/reducers/monitor.ts
@@ -7,14 +7,23 @@ import {
 } from '../constants/actionTypes';
 import { MonitorActionAction, StoreAction } from '../actions';
 
+export interface MonitorStateMonitorState {
+  inspectedStatePath?: string[];
+  tabName?: string;
+  subTabName?: string;
+  selectedActionId?: number | null;
+  startActionId?: number | null;
+  inspectedActionPath?: string[];
+  __overwritten__?: string;
+}
 export interface MonitorState {
   selected: string;
-  monitorState: unknown | undefined;
+  monitorState: MonitorStateMonitorState | undefined;
   sliderIsOpen: boolean;
   dispatcherIsOpen: boolean;
 }
 
-const initialState = {
+const initialState: MonitorState = {
   selected: 'InspectorMonitor',
   monitorState: undefined,
   sliderIsOpen: true,
@@ -24,7 +33,7 @@ const initialState = {
 export function dispatchMonitorAction(
   state: MonitorState,
   action: MonitorActionAction
-) {
+): MonitorState {
   return {
     ...state,
     monitorState:
@@ -37,7 +46,10 @@ export function dispatchMonitorAction(
   };
 }
 
-export default function monitor(state = initialState, action: StoreAction) {
+export default function monitor(
+  state = initialState,
+  action: StoreAction
+): MonitorState {
   switch (action.type) {
     case MONITOR_ACTION:
       return dispatchMonitorAction(state, action);
@@ -56,7 +68,7 @@ export default function monitor(state = initialState, action: StoreAction) {
       };
     }
     case UPDATE_MONITOR_STATE: {
-      let inspectedStatePath = state.monitorState.inspectedStatePath;
+      let inspectedStatePath = state.monitorState!.inspectedStatePath!;
       if (action.nextState.inspectedStatePath) {
         inspectedStatePath = [
           ...inspectedStatePath.slice(0, -1),
diff --git a/packages/redux-devtools-core/src/app/reducers/reports.ts b/packages/redux-devtools-core/src/app/reducers/reports.ts
index cf57f100..37376bed 100644
--- a/packages/redux-devtools-core/src/app/reducers/reports.ts
+++ b/packages/redux-devtools-core/src/app/reducers/reports.ts
@@ -3,9 +3,11 @@ import {
 } from '../constants/actionTypes';
 import { StoreAction } from '../actions';
 
-export interface ReportsState {}
+export interface ReportsState {
+  data: unknown[];
+}
 
-const initialState = {
+const initialState: ReportsState = {
   data: [],
 };
 
diff --git a/packages/redux-devtools-core/src/app/utils/monitorActions.ts b/packages/redux-devtools-core/src/app/utils/monitorActions.ts
index 4cc58517..3ed3cc80 100644
--- a/packages/redux-devtools-core/src/app/utils/monitorActions.ts
+++ b/packages/redux-devtools-core/src/app/utils/monitorActions.ts
@@ -2,8 +2,9 @@ import difference from 'lodash/difference';
 import omit from 'lodash/omit';
 import stringifyJSON from './stringifyJSON';
 import { SET_STATE } from '../constants/actionTypes';
+import { State } from '../reducers/instances';
 
-export function sweep(state) {
+export function sweep(state: State): State {
   return {
     ...state,
     actionsById: omit(state.actionsById, state.skippedActionIds),
diff --git a/packages/redux-devtools-core/src/app/utils/parseJSON.ts b/packages/redux-devtools-core/src/app/utils/parseJSON.ts
index 63370feb..c528eb60 100644
--- a/packages/redux-devtools-core/src/app/utils/parseJSON.ts
+++ b/packages/redux-devtools-core/src/app/utils/parseJSON.ts
@@ -26,7 +26,10 @@ export function reviver(key, value) {
   return value;
 }
 
-export default function parseJSON(data, serialize) {
+export default function parseJSON(
+  data: string | undefined,
+  serialize?: boolean
+) {
   if (typeof data !== 'string') return data;
   try {
     return serialize ? jsan.parse(data, reviver) : jsan.parse(data);
diff --git a/packages/redux-devtools-core/src/app/utils/updateState.ts b/packages/redux-devtools-core/src/app/utils/updateState.ts
index 7157da99..f802e272 100644
--- a/packages/redux-devtools-core/src/app/utils/updateState.ts
+++ b/packages/redux-devtools-core/src/app/utils/updateState.ts
@@ -1,12 +1,13 @@
 import commitExcessActions from './commitExcessActions';
+import { State } from '../reducers/instances';
 
 export function recompute(
-  previousLiftedState,
+  previousLiftedState: State,
   storeState,
   action,
   nextActionId = 1,
-  maxAge,
-  isExcess
+  maxAge?: number,
+  isExcess?: boolean
 ) {
   const actionId = nextActionId - 1;
   const liftedState = { ...previousLiftedState };