Vuex4+TS 之 vuex-composition-helpers

A util package to use Vuex with Composition API easily.

Installation

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$ npm install vuex-composition-helpers

This library is not transpiled by default. Your project should transpile it, which makes the final build smaller and more tree-shakeable. Take a look at transpiling.

Non-typescript projects may import the library from the dist subdirectory, where plain javascript distribution files are located.

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import { useState, ... } from 'vuex-composition-helpers/dist';

Basic Usage Examples

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import { useState, useActions } from 'vuex-composition-helpers';

export default {
    props: {
        articleId: String
    },
    setup(props) {
        const { fetch } = useActions(['fetch']);
        const { article, comments } = useState(['article', 'comments']);
        fetch(props.articleId); // dispatch the "fetch" action

        return {
            // both are computed compositions for to the store
            article,
            comments
        }
    }
}

Namespaced Usage Examples

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import { createNamespacedHelpers } from 'vuex-composition-helpers';
const { useState, useActions } = createNamespacedHelpers('articles'); // specific module name

export default {
    props: {
        articleId: String
    },
    setup(props) {
        const { fetch } = useActions(['fetch']);
        const { article, comments } = useState(['article', 'comments']);
        fetch(props.articleId); // dispatch the "fetch" action

        return {
            // both are computed compositions for to the store
            article,
            comments
        }
    }
}

You can also import your store from outside the component, and create the helpers outside of the setup method, for example:

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import { createNamespacedHelpers } from 'vuex-composition-helpers';
import store from '../store'; // local store file
const { useState, useActions } = createNamespacedHelpers(store, 'articles'); // specific module name
const { fetch } = useActions(['fetch']);

export default {
    props: {
        articleId: String
    },
    setup(props) {
        const { article, comments } = useState(['article', 'comments']);
        fetch(props.articleId); // dispatch the "fetch" action

        return {
            // both are computed compositions for to the store
            article,
            comments
        }
    }
}

Typescript mappings

You can also supply typing information to each of the mapping functions to provide a fully typed mapping.

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import { useState, useActions } from 'vuex-composition-helpers';

interface RootGetters extends GetterTree<any, any> {
    article: string;
    comments: string;
}

interface RootActions extends ActionTree<any, any> {
    fetch: (ctx: ActionContext<any, any>, payload: number);
}

export default {
    props: {
        articleId: String
    },
    setup(props) {
        const { fetch } = useActions<RootActions>(['fetch']);
        const { article, comments } = useGetters<RootGetters>(['article', 'comments']);
        fetch(props.articleId); // dispatch the "fetch" action

        return {
            // both are computed compositions for to the store
            article,
            comments
        }
    }
}

Advanced Usage Example

Consider separate the store composition file from the store usage inside the component. i.g.:

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// store-composition.js:
import { wrapStore } from 'vuex-composition-helpers';
import store from '@/store'; // local store file

export default wrapStore(store);
// my-component.vue:
import { createNamespacedHelpers } from './store-composition.js';
const { useState, useActions } = createNamespacedHelpers('articles'); // specific module name
const { fetch } = useActions(['fetch']);

export default {
    props: {
        articleId: String
    },
    setup(props) {
        const { article, comments } = useState(['article', 'comments']);
        fetch(props.articleId); // dispatch the "fetch" action

        return {
            // both are computed compositions for to the store
            article,
            comments
        }
    }
}

Transpiling

It depends on you project's stack, but let's say it consists of webpack, babel and ts-loader.

The rule processing .ts files should whitelist vuex-composition-helpers. If your project uses a raw webpack installation, it should resemble this.

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// webpack.config.js
module.exports = {
  ...
  module: {
    rules: [
      test: /\.ts$/,
      // If node_modules is excluded from the rule, vuex-composition-helpers should be an exception
      exclude: /node_modules(?!\/vuex-composition-helpers)/,
      use: [
        {
          loader: 'babel-loader',
          ...
        },
        {
          loader: 'thread-loader',
          options: { ... }
        },
        {
          loader: 'ts-loader',
          ...
        }
    ]
  }
}

When using vue-cli, use this instead

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// vue.config.js
module.exports = {
  ...
  chainWebpack: config => {
    config
      .rule('ts')
      .include
      .add(/vuex-composition-helpers/)
  }
}

If your webpack configuration is excluding node_modules from the bundle, which is common for SSR, this library should be an exception.

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// webpack.config.js
module.exports = {
 ...
  externals: [nodeExternals({
    whitelist: [/^vuex-composition-helpers/]
  })],
}

Babel should not exclude or ignore this library. If you use vue-cli, you may need the following configuration.

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// vue.config.js
module.exports = {
  ...
  transpileDependencies: ['vuex-composition-helpers'],
}

Although it's not strictly required, maybe ts-loader needs to have allowTsInNodeModules enabled in your project. Finally check that this library is not excluded in tsconfig.json, and if it was necessary, put it in the include list.

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