diff --git a/packages/store/src/create-computed/create-computed-methods.ts b/packages/store/src/create-computed/create-computed-methods.ts
index 6ac105f..37ae5f9 100644
--- a/packages/store/src/create-computed/create-computed-methods.ts
+++ b/packages/store/src/create-computed/create-computed-methods.ts
@@ -18,16 +18,16 @@ type ComputedDefToMethods<TComputedDef> = TComputedDef extends (
 	input: infer TReadInput
 ) => infer TReadValue
 	? {
-			use: (input: VoidIfUnknown<TReadInput>) => TReadValue;
-			get: (input: VoidIfUnknown<TReadInput>) => TReadValue;
+			use: (input: VoidIfUnknown<TReadInput>) => Readonly<TReadValue>;
+			get: (input: VoidIfUnknown<TReadInput>) => Readonly<TReadValue>;
 		}
 	: TComputedDef extends {
 				read: (input: infer TReadInput) => infer TReadValue;
 				write?: (value: infer TWriteInput) => void;
 		  }
 		? {
-				use: (input: VoidIfUnknown<TReadInput>) => TReadValue;
-				get: (input: VoidIfUnknown<TReadInput>) => TReadValue;
+				use: (input: VoidIfUnknown<TReadInput>) => Readonly<TReadValue>;
+				get: (input: VoidIfUnknown<TReadInput>) => Readonly<TReadValue>;
 				set: TComputedDef['write'] extends undefined
 					? never
 					: (value: TWriteInput) => void;
@@ -39,7 +39,7 @@ export type ComputedMethods<TComputedProps extends ComputedProps> = {
 };
 
 export type ComputedBuilder<TStore, TComputedProps extends ComputedProps> = (
-	store: TStore
+	store: Readonly<TStore>
 ) => TComputedProps;
 
 function hasWrite<TReadValue, TWriteInput, TReadInput>(
diff --git a/packages/store/src/create-state-methods/state.types.ts b/packages/store/src/create-state-methods/state.types.ts
index 6f88c16..522f12a 100644
--- a/packages/store/src/create-state-methods/state.types.ts
+++ b/packages/store/src/create-state-methods/state.types.ts
@@ -2,6 +2,10 @@
 
 import { EqualityChecker, Simplify, StateValue } from '../types';
 
+type ReadonlyState<TSelector, TStateValue> = TSelector extends (state: TStateValue) => infer TReturnType
+	? Readonly<TReturnType>
+	: Readonly<TStateValue>;
+
 export type State<TStateValue extends StateValue> = (TStateValue extends object
 	? {
 			[TKey in keyof TStateValue]: State<TStateValue[TKey]>;
@@ -28,9 +32,7 @@ export type State<TStateValue extends StateValue> = (TStateValue extends object
 			) => TStateValue,
 		>(
 			selector?: TSelector
-		) => TSelector extends (state: TStateValue) => infer TReturnType
-			? TReturnType
-			: TStateValue;
+		) => ReadonlyState<TSelector, TStateValue>;
 		/**
 		 * Set a new state for the entire store using Immer
 		 * @param fn A function that mutates the current state
@@ -56,10 +58,7 @@ export type State<TStateValue extends StateValue> = (TStateValue extends object
 		>(
 			selector?: TSelector,
 			equalityFn?: EqualityChecker<TStateValue>
-		) => TSelector extends (state: TStateValue) => infer TReturnType
-			? TReturnType
-			: TStateValue;
-
+		) => ReadonlyState<TSelector, TStateValue>;
 		/**
 		 * Subscribe to changes in the store
 		 * @param callback A callback that is called whenever the store changes
diff --git a/packages/store/src/store-builder/store.tsx b/packages/store/src/store-builder/store.tsx
index 10ce525..cc88b27 100644
--- a/packages/store/src/store-builder/store.tsx
+++ b/packages/store/src/store-builder/store.tsx
@@ -8,7 +8,6 @@ import {
 	ComputedProps,
 	createComputedMethods,
 } from '../create-computed/create-computed-methods';
-import { createEffectMethods } from '../create-effects';
 import { createStoreApiProxy } from '../create-store/create-store-proxy';
 import { createStore } from '../create-store/create-zustand-store';
 
@@ -83,23 +82,9 @@ export const store = <TState extends StateValue>(
 export function getDefaultStoreDef<TState extends StateValue>(
 	initialState?: TState
 ) {
-	const _def = {
+	return new StoreDef({
 		initialState,
 		extensions: [],
 		options: {},
-		get name() {
-			const options = _def.options as StoreOptions<TState>;
-			const name = options.name as string;
-			if (name) return name;
-
-			const stateString = _def.initialState
-				? JSON.stringify(_def.initialState)
-				: 'no-state';
-			const defaultName = `(davstack/store)initialState=${stateString}`;
-			Object.assign(_def.options, { name: defaultName });
-			return defaultName as string;
-		},
-	};
-
-	return _def satisfies StoreDef<TState>;
+	})
 }
diff --git a/packages/store/src/types.ts b/packages/store/src/types.ts
index 9e0f002..7861ca2 100644
--- a/packages/store/src/types.ts
+++ b/packages/store/src/types.ts
@@ -12,11 +12,32 @@ export type StateValue = unknown;
 
 export type { StoreApi as ZustandStoreApi } from 'zustand';
 
-export interface StoreDef<TStateValue extends StateValue = {}> {
-	name: string;
+export class StoreDef<TStateValue extends StateValue = {}> {
+
 	extensions: Array<(store: StoreApi<TStateValue>) => Record<string, any>>;
 	options: StoreOptions<TStateValue>;
 	initialState: TStateValue | undefined;
+
+	constructor(def: Omit<StoreDef<TStateValue>, "name">) { 
+		this.extensions = def.extensions;
+		this.options = def.options;
+		this.initialState = def.initialState
+	}
+
+	get name() {
+		const _def = this;
+		const options = _def.options as StoreOptions<TStateValue>;
+		const name = options.name as string;
+		if (name) return name;
+
+		const stateString = _def.initialState
+			? JSON.stringify(_def.initialState)
+			: 'no-state';
+		const defaultName = `(davstack/store)initialState=${stateString}`;
+		Object.assign(_def.options, { name: defaultName });
+		return defaultName as string;
+	}
+
 }
 
 export type StoreBuilderMethods<