diff --git a/packages/redux-devtools-app/src/actions/index.ts b/packages/redux-devtools-app/src/actions/index.ts
index a6e5ae43..12c798ac 100644
--- a/packages/redux-devtools-app/src/actions/index.ts
+++ b/packages/redux-devtools-app/src/actions/index.ts
@@ -45,6 +45,7 @@ import { Features, State } from '../reducers/instances';
 import { MonitorStateMonitorState } from '../reducers/monitor';
 import { LiftedAction } from '@redux-devtools/core';
 import { Data } from '../reducers/reports';
+import { LiftedState } from '@redux-devtools/instrument';
 
 let monitorReducer: (
   monitorProps: unknown,
@@ -363,10 +364,10 @@ export interface LibConfig {
 }
 
 export interface RequestBase {
-  id: string;
+  id?: string;
   instanceId?: string;
   action?: string;
-  name?: string;
+  name?: string | undefined;
   libConfig?: LibConfig;
   actionsById?: string;
   computedStates?: string;
@@ -376,14 +377,15 @@ export interface RequestBase {
 }
 interface InitRequest extends RequestBase {
   type: 'INIT';
-  action: string;
+  action?: string;
+  payload?: string;
 }
 interface ActionRequest extends RequestBase {
   type: 'ACTION';
-  isExcess: boolean;
+  isExcess?: boolean;
   nextActionId: number;
   maxAge: number;
-  batched: boolean;
+  batched?: boolean;
 }
 interface StateRequest extends RequestBase {
   type: 'STATE';
@@ -412,7 +414,7 @@ export type Request =
 interface UpdateStateAction {
   type: typeof UPDATE_STATE;
   request?: Request;
-  id?: string;
+  id?: string | number;
 }
 
 interface SetStateAction {
@@ -494,8 +496,8 @@ interface UnsubscribeAction {
 export interface EmitAction {
   type: typeof EMIT;
   message: string;
-  id?: string | false;
-  instanceId?: string;
+  id?: string | number | false;
+  instanceId?: string | number;
   action?: unknown;
   state?: unknown;
 }
diff --git a/packages/redux-devtools-app/src/components/InstanceSelector.tsx b/packages/redux-devtools-app/src/components/InstanceSelector.tsx
index 357351b7..81680a38 100644
--- a/packages/redux-devtools-app/src/components/InstanceSelector.tsx
+++ b/packages/redux-devtools-app/src/components/InstanceSelector.tsx
@@ -9,7 +9,7 @@ type DispatchProps = ResolveThunks<typeof actionCreators>;
 type Props = StateProps & DispatchProps;
 
 class InstanceSelector extends Component<Props> {
-  select?: { readonly value: string; readonly label: string }[];
+  select?: { readonly value: string; readonly label: string | number }[];
 
   render() {
     this.select = [{ value: '', label: 'Autoselect instances' }];
diff --git a/packages/redux-devtools-app/src/middlewares/exportState.ts b/packages/redux-devtools-app/src/middlewares/exportState.ts
index 40e9cd0a..ffefe851 100644
--- a/packages/redux-devtools-app/src/middlewares/exportState.ts
+++ b/packages/redux-devtools-app/src/middlewares/exportState.ts
@@ -5,7 +5,7 @@ import { Dispatch, MiddlewareAPI } from 'redux';
 import { ExportRequest, StoreAction } from '../actions';
 import { StoreState } from '../reducers';
 
-let toExport: string | undefined;
+let toExport: string | number | undefined;
 
 function download(state: string) {
   const blob = new Blob([state], { type: 'octet/stream' });
diff --git a/packages/redux-devtools-app/src/reducers/instances.ts b/packages/redux-devtools-app/src/reducers/instances.ts
index 9b2aa01e..85ddde6b 100644
--- a/packages/redux-devtools-app/src/reducers/instances.ts
+++ b/packages/redux-devtools-app/src/reducers/instances.ts
@@ -34,8 +34,8 @@ export interface Features {
 }
 
 export interface Options {
-  name?: string;
-  connectionId?: string;
+  name?: string | number;
+  connectionId?: string | number;
   explicitLib?: string;
   lib?: string;
   actionCreators?: ActionCreator[];
@@ -57,9 +57,9 @@ export interface State {
 
 export interface InstancesState {
   selected: string | null;
-  current: string;
+  current: string | number;
   sync: boolean;
-  connections: { [id: string]: string[] };
+  connections: { [id: string]: (string | number)[] };
   options: { [id: string]: Options };
   states: { [id: string]: State };
   persisted?: boolean;
@@ -86,7 +86,7 @@ export const initialState: InstancesState = {
 function updateState(
   state: { [id: string]: State },
   request: Request,
-  id: string,
+  id: string | number,
   serialize: boolean | undefined
 ) {
   let payload: State = request.payload as State;
@@ -268,8 +268,8 @@ function removeState(state: InstancesState, connectionId: string) {
 
 function init(
   { type, action, name, libConfig = {} }: Request,
-  connectionId: string,
-  current: string
+  connectionId: string | number,
+  current: string | number
 ): Options {
   let lib;
   let actionCreators;
@@ -310,7 +310,7 @@ export default function instances(
     case UPDATE_STATE: {
       const { request } = action;
       if (!request) return state;
-      const connectionId = action.id || request.id;
+      const connectionId = (action.id || request.id)!;
       const current = request.instanceId || connectionId;
       let connections = state.connections;
       let options = state.options;
diff --git a/packages/redux-devtools-app/src/utils/monitorActions.ts b/packages/redux-devtools-app/src/utils/monitorActions.ts
index 0889bfcc..7c295c57 100644
--- a/packages/redux-devtools-app/src/utils/monitorActions.ts
+++ b/packages/redux-devtools-app/src/utils/monitorActions.ts
@@ -23,7 +23,7 @@ export function sweep(state: State): State {
 export function nonReduxDispatch(
   store: MiddlewareAPI<Dispatch<StoreAction>, StoreState>,
   message: string,
-  instanceId: string,
+  instanceId: string | number,
   action: DispatchAction,
   initialState: string | undefined,
   preInstances?: InstancesState