diff --git a/lib/local-cache.ts b/lib/local-cache.ts
index 783db79..29ff665 100644
--- a/lib/local-cache.ts
+++ b/lib/local-cache.ts
@@ -27,25 +27,34 @@ import * as logger from "./logger";
 import * as scheduling from "./scheduling";
 import * as expression from "./common/expression";
 import { parse } from "./common/expression-parser";
-import { Preset, Expression } from "./types";
+import {
+  Preset,
+  Expression,
+  Provisions,
+  VirtualParameters,
+  Files,
+  Users,
+  Permissions,
+  Config,
+  UiConfig
+} from "./types";
 
-interface Permissions {
-  [role: string]: {
-    [access: number]: {
-      [resource: string]: {
-        access: number;
-        filter: Expression;
-        validate?: Expression;
-      };
-    };
-  };
+interface Snapshot {
+  presets: Preset[];
+  provisions: Provisions;
+  virtualParameters: VirtualParameters;
+  files: Files;
+  permissions: Permissions;
+  users: Users;
+  config: Config;
+  ui: UiConfig;
 }
 
 const REFRESH = 3000;
 const EVICT_TIMEOUT = 60000;
 
-const snapshots = new Map();
-let currentSnapshot = null;
+const snapshots = new Map<string, Snapshot>();
+let currentSnapshot: string = null;
 let nextRefresh = 1;
 
 function computeHash(snapshot): string {
@@ -244,7 +253,7 @@ async function fetchPresets(): Promise<Preset[]> {
   return presets;
 }
 
-async function fetchProvisions(): Promise<{}> {
+async function fetchProvisions(): Promise<Provisions> {
   const res = await db.getProvisions();
 
   const provisions = {};
@@ -263,7 +272,7 @@ async function fetchProvisions(): Promise<{}> {
   return provisions;
 }
 
-async function fetchVirtualParameters(): Promise<{}> {
+async function fetchVirtualParameters(): Promise<VirtualParameters> {
   const res = await db.getVirtualParameters();
 
   const virtualParameters = {};
@@ -301,7 +310,7 @@ async function fetchPermissions(): Promise<Permissions> {
   return permissions;
 }
 
-async function fetchFiles(): Promise<{}> {
+async function fetchFiles(): Promise<Files> {
   const res = await db.getFiles();
   const files = {};
 
@@ -316,7 +325,7 @@ async function fetchFiles(): Promise<{}> {
   return files;
 }
 
-async function fetchUsers(): Promise<{}> {
+async function fetchUsers(): Promise<Users> {
   const _users = await db.getUsers();
   const users = {};
 
@@ -331,7 +340,7 @@ async function fetchUsers(): Promise<{}> {
   return users;
 }
 
-async function fetchConfig(): Promise<[{}, {}]> {
+async function fetchConfig(): Promise<[Config, UiConfig]> {
   const conf = await db.getConfig();
 
   conf.sort((a, b) => (a.id > b.id ? 1 : a.id < b.id ? -1 : 0));
@@ -436,25 +445,19 @@ export function getPresets(snapshotKey): Preset[] {
   return snapshot.presets;
 }
 
-export function getProvisions(
-  snapshotKey
-): { [name: string]: { md5: string; script: vm.Script } } {
+export function getProvisions(snapshotKey): Provisions {
   const snapshot = snapshots.get(snapshotKey);
   if (!snapshot) throw new Error("Cache snapshot does not exist");
   return snapshot.provisions;
 }
 
-export function getVirtualParameters(
-  snapshotKey
-): { [name: string]: { md5: string; script: vm.Script } } {
+export function getVirtualParameters(snapshotKey): VirtualParameters {
   const snapshot = snapshots.get(snapshotKey);
   if (!snapshot) throw new Error("Cache snapshot does not exist");
   return snapshot.virtualParameters;
 }
 
-export function getFiles(
-  snapshotKey
-): { [name: string]: { length: number; md5: string; contentType: string } } {
+export function getFiles(snapshotKey): Files {
   const snapshot = snapshots.get(snapshotKey);
   if (!snapshot) throw new Error("Cache snapshot does not exist");
   return snapshot.files;
@@ -520,14 +523,14 @@ export function getUsers(snapshotKey): {} {
   return snapshot.users;
 }
 
-export function getPermissions(snapshotKey): {} {
+export function getPermissions(snapshotKey): Permissions {
   const snapshot = snapshots.get(snapshotKey);
   if (!snapshot) throw new Error("Cache snapshot does not exist");
 
   return snapshot.permissions;
 }
 
-export function getUiConfig(snapshotKey): {} {
+export function getUiConfig(snapshotKey): UiConfig {
   const snapshot = snapshots.get(snapshotKey);
   if (!snapshot) throw new Error("Cache snapshot does not exist");
 
diff --git a/lib/types.ts b/lib/types.ts
index ff2c3d8..b9748c1 100644
--- a/lib/types.ts
+++ b/lib/types.ts
@@ -22,6 +22,7 @@ import PathSet from "./common/path-set";
 import VersionedMap from "./versioned-map";
 import InstanceSet from "./instance-set";
 import { IncomingMessage, ServerResponse } from "http";
+import { Script } from "vm";
 
 export type Expression = string | number | boolean | null | any[];
 
@@ -324,6 +325,34 @@ export interface Preset {
   provisions: string[][];
 }
 
+export interface Provisions {
+  [name: string]: { md5: string; script: Script };
+}
+
+export interface VirtualParameters {
+  [name: string]: { md5: string; script: Script };
+}
+
+export interface Files {
+  [name: string]: { length: number; md5: string; contentType: string };
+}
+
+export interface Users {
+  [name: string]: { password: string; salt: string; roles: string[] };
+}
+
+export interface Permissions {
+  [role: string]: {
+    [access: number]: {
+      [resource: string]: {
+        access: number;
+        filter: Expression;
+        validate?: Expression;
+      };
+    };
+  };
+}
+
 export type PermissionSet = {
   [resource: string]: {
     access: number;
@@ -332,6 +361,21 @@ export type PermissionSet = {
   };
 }[];
 
+export interface Config {
+  [name: string]: Expression;
+}
+
+export interface UiConfig {
+  filters: {};
+  device: {};
+  index: {};
+  overview: {
+    charts?: {};
+    groups?: {};
+  };
+  pageSize?: Expression;
+}
+
 export interface SoapMessage {
   id: string;
   cwmpVersion: string;
diff --git a/ui/app.ts b/ui/app.ts
index 5aee77c..78b915b 100644
--- a/ui/app.ts
+++ b/ui/app.ts
@@ -37,13 +37,14 @@ import * as usersPage from "./users-page";
 import Authorizer from "../lib//common/authorizer";
 import * as notifications from "./notifications";
 import { contextifyComponent } from "./components";
+import { PermissionSet, UiConfig } from "../lib/types";
 
 declare global {
   interface Window {
     authorizer: Authorizer;
-    permissionSets: any;
+    permissionSets: PermissionSet[];
     username: string;
-    clientConfig: any;
+    clientConfig: { ui: UiConfig };
     configSnapshot: string;
     genieacsVersion: string;
   }