vuex-context

Write fully type inferred Vuex modules:

• Extremely lightweight
• No boilerplate
• No class
• Handles module refactoring

Install

1. Install vuex
   npm install vuex --save

2. Install module:
   npm install vuex-context --save

Usage

1. Write your Vuex modules in the standard Vuex way:

export interface CounterState {
  count: number;
}
export const namespaced = true;
export const state = (): CounterState => ({
  count: 0
});
export const mutations = {
  increment(state: CounterState) {
    state.count++;
  },
  incrementBy(state: CounterState, payload: number) {
    state.count += payload;
  }
};
export const actions = {
  async incrementAsync(context) {
    // ...
  }
};
export const getters = {
  doubleCount(state: CounterState): number {
    return state.count * 2;
  },
  quadrupleCount(state: CounterState, context): number {
    // ...
  }
}

1. Create the module’s context

export const Counter = Context.fromModule({
  state,
  mutations,
  actions,
  getters
});

1. That’s it, now you have access to a completely typed version of your module

// Use store and the namespace leading to the module to get a new context instance
const counterModule = Counter.getInstance(store, 'counter');
counterModule.dispatch.incrementAsync();
// Or use the context to access the current scope
export const actions = {
  async incrementAsync(context) {
    const counterModule = Counter.getInstance(context);
    counterModule.commit.increment();
  }
};
// You can also type your getters
export const getters = {
  doubleCount(state: CounterState): number {
    return state.count * 2;
  },
  quadrupleCount(state: CounterState, context): number {
    const getters = Counter.getGetters(context);
    return getters.doubleCount * 2;
  }
}

Circular references

Warning: Be careful when returning values from your actions and getters!

export const actions = {
  async incrementAsync(context) {
    const counterModule = Counter.getInstance(context);
    counterModule.commit.increment();
    // Circular reference here, as incrementAsync needs the type from counterModule and counterModule needs the type from incrementAsync
    // Result: counterModule is cast to any
    return counterModule.state.count;
  }
};

To avoid this, you should manually write the return types of your actions and getters:

export const actions = {
  // Specify the return type here
  async incrementAsync(context): Promise<number> {
    const counterModule = Counter.getInstance(context);
    counterModule.commit.increment();
    // Everything works fine now
    return counterModule.state.count;
  }
};

Contributors

If you are interested and want to help out, don’t hesitate to contact me or to create a pull request with your fixes / features.

The project now also contains samples that you can use to directly test out your features during development.

1. Clone the repository

2. Install dependencies
   npm install

3. Launch samples
   npm run serve

4. Launch unit tests situated in ./tests. The unit tests are written in Jest.
   npm run test:unit

License

This project is licensed under the MIT License - see the LICENSE.md file for details