vanilla-state-manager
v1.0.2
Published
Javascript/Typescript state management library that uses Immer.js behind the scenes to handle state immutability
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Readme
Here is the updated documentation:
Vanilla State Manager
Overview
Vanilla State Manager is a lightweight, type-safe state management solution for JavaScript applications. It provides a simple and intuitive API for managing state, handling updates, and notifying listeners.
Installation
To install Vanilla State Manager, run one of the following commands:
npm install vanilla-state-manager
yarn add vanilla-state-manager
pnpm install vanilla-state-manager
Usage
Here's an example of how to use Vanilla State Manager:
import StateManager from "vanilla-state-manager";
// Create a new state manager with an initial state
const initialState = { count: 0 };
const stateManager = new StateManager(initialState);
// Get the current state
const currentState = stateManager.getState();
console.log(currentState); // Output: { count: 0 }
// Update the state using the setState method
stateManager.setState((draft) => {
draft.count += 1;
});
console.log(stateManager.getState()); // Output: { count: 1 }
// Subscribe to state changes using the subscribe method
const unsubscribe = stateManager.subscribe((state) => {
console.log(state);
});
stateManager.setState((draft) => {
draft.count += 1;
}); // Output: { count: 2 }
unsubscribe();
API
StateManager<T>
constructor(initialState: T)
: Creates a new state manager with the given initial state.getState(): T
: Returns the current state.setState(updater: (draft: T) => void): void
: Updates the state using the provided updater function.subscribe(listener: Listener<T>): () => void
: Subscribes to state changes using the provided listener function.
Listener<T>
(state: T) => void
: A function that will be called whenever the state changes.
Types
T
: The type of the state.
Errors
State cannot be null or undefined
: Thrown when the initial state is null or undefined.Updater function cannot be null or undefined
: Thrown when the updater function is null or undefined.Listener function cannot be null or undefined
: Thrown when the listener function is null or undefined.
Dependencies
immer
: Used for state immutability.
License
Vanilla State Manager is licensed under the MIT License.
TypeScript
Usage
Here's an example of how to use Vanilla State Manager with TypeScript:
import StateManager from "vanilla-state-manager";
// Create a new state manager with an initial state
interface State {
count: number;
}
const initialState: State = { count: 0 };
const stateManager = new StateManager(initialState);
// Get the current state
const currentState: State = stateManager.getState();
console.log(currentState); // Output: { count: 0 }
// Update the state using the setState method
stateManager.setState((draft: State) => {
draft.count += 1;
});
console.log(stateManager.getState()); // Output: { count: 1 }
// Subscribe to state changes using the subscribe method
const unsubscribe = stateManager.subscribe((state: State) => {
console.log(state);
});
stateManager.setState((draft: State) => {
draft.count += 1;
}); // Output: { count: 2 }
unsubscribe();
Type Definitions
The StateManager
class is generic, so you can specify the type of the state when creating a new instance. The getState
and setState
methods will then return and accept the specified type, respectively.
The Listener
type is also generic, so you can specify the type of the state when creating a new listener. The listener function will then receive the specified type as an argument.
Note that the immer
package is already included in the vanilla-state-manager
package, so you don't need to install it separately.