use-travel

A React hook for state time travel with undo, redo, reset and archive functionalities.

Motivation

use-travel is a small and high-performance library for state time travel. It's built on Mutative to support mutation updating immutable data. It's designed to be simple and easy to use, and it's also customizable for different use cases.

It's suitable for building any time travel feature in your application.

Installation

npm install use-travel mutative
# or
yarn add use-travel mutative

Features

• Undo/Redo/Reset/Go/Archive functionalities
• Mutations update immutable data
• Small size for time travel with Patches history
• Customizable history size
• Customizable initial patches
• High performance
• Mark function for custom immutability

Example

• Basic
• Manual Time Travel

API

You can use useTravel to create a time travel state. And it returns a tuple with the current state, the state setter, and the controls. The controls include back(), forward(), reset(), canBack(), canForward(), canArchive(), getHistory(), patches, position, archive(), and go().

import { useTravel } from 'use-travel';

const App = () => {
  const [state, setState, controls] = useTravel(0, {
    maxHistory: 10,
    initialPatches: {
      patches: [],
      inversePatches: [],
    },
  });
  return (
    <div>
      <div>{state}</div>
      <button onClick={() => setState(state + 1)}>Increment</button>
      <button onClick={() => setState(state - 1)}>Decrement</button>
      <button onClick={() => controls.back()} disabled={!controls.canBack()}>
        Undo
      </button>
      <button
        onClick={() => controls.forward()}
        disabled={!controls.canForward()}
      >
        Redo
      </button>
      <button onClick={controls.reset}>Reset</button>
      {controls.getHistory().map((state, index) => (
        <div key={index}>{state}</div>
      ))}
      {controls.patches.patches.map((patch, index) => (
        <div key={index}>{JSON.stringify(patch)}</div>
      ))}
      <div>{controls.position}</div>
      <button
        onClick={() => {
          controls.go(1);
        }}
      >
        Go
      </button>
    </div>
  );
};

Parameters

Parameter	type	description	default
maxHistory	number	The maximum number of history to keep	10
initialPatches	TravelPatches	The initial patches	{patches: [],inversePatches: []}
initialPosition	number	The initial position of the state	0
autoArchive	boolean	Auto archive the state	true

Returns

Return	type	description
state	Value<S, F>	The current state
setState	Updater<InitialValue>	The state setter, support mutation update or return immutable data
controls.back	(amount?: number) => void	Go back to the previous state
controls.forward	(amount?: number) => void	Go forward to the next state
controls.reset	() => void	Reset the state to the initial state
controls.canBack	() => boolean	Check if can go back to the previous state
controls.canForward	() => boolean	Check if can go forward to the next state
controls.canArchive	() => boolean	Check if can archive the current state
controls.getHistory	() => T[]	Get the history of the state
controls.patches	TravelPatches[]	Get the patches history of the state
controls.position	number	Get the current position of the state
controls.go	(nextPosition: number) => void	Go to the specific position of the state
controls.archive	() => void	Archive the current state(the autoArchive options should be false)

TravelPatches is the type of patches history, it includes patches and inversePatches.

If you want to control the state travel manually, you can set the autoArchive option to false, and use the controls.archive function to archive the state.

If you want to persist the state, you can use state/controls.patches/controls.position to save the travel history. Then, read the persistent data as initialState, initialPatches, and initialPosition when initializing the state, like this:

const [state, setState, controls] = useTravel(initialState, {
  initialPatches,
  initialPosition,
});

License

use-travel is MIT licensed.