diff --git a/.vscode/settings.json b/.vscode/settings.json
index 52d6a46d33..1a31612182 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -9,5 +9,8 @@
   "eslint.validate": [
     "javascript",
     { "language": "typescript", "autoFix": true }
-  ]
+  ],
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": true
+  }
 }
diff --git a/__tests__/pinia/stores/user.ts b/__tests__/pinia/stores/user.ts
index 67ca840fc3..4697483a9d 100644
--- a/__tests__/pinia/stores/user.ts
+++ b/__tests__/pinia/stores/user.ts
@@ -2,7 +2,7 @@ import { createStore } from '../../../src'
 
 export const useUserStore = createStore('user', () => ({
   name: 'Eduardo',
-  isAdmin: true as boolean,
+  isAdmin: true,
 }))
 
 export function logout() {
diff --git a/src/types.ts b/src/types.ts
index 58052fb97c..ea88e470e0 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,24 +1,6 @@
 import { Ref } from '@vue/composition-api'
 
-interface JSONSerializable {
-  toJSON(): string
-}
-
-export type StateTreeValue =
-  | string
-  | symbol
-  | number
-  | boolean
-  | null
-  | void
-  | Function
-  | StateTree
-  | StateTreeArray
-  | JSONSerializable
-
-// eslint-disable-next-line @typescript-eslint/no-empty-interface
-export interface StateTree
-  extends Record<string | number | symbol, StateTreeValue> {}
+export type StateTree = Record<string | number | symbol, any>
 
 export function isPlainObject(
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -32,16 +14,6 @@ export function isPlainObject(
   )
 }
 
-// symbol is not allowed yet https://github.com/Microsoft/TypeScript/issues/1863
-// export interface StateTree {
-//   [x: number]: StateTreeValue
-//   [x: symbol]: StateTreeValue
-//   [x: string]: StateTreeValue
-// }
-
-// eslint-disable-next-line @typescript-eslint/no-empty-interface
-interface StateTreeArray extends Array<StateTreeValue> {}
-
 export interface StoreGetter<S extends StateTree, T = any> {
   (state: S): T
 }