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Dec 4, 20202 min read

Extending a Component Library using Vuex


At FeldsparTech we are working on a no-code platform called Atman. Atman's UI is a component library that works as a standalone application or can be embedded into another application to enable quick no-code workflows.


One of our goals is to allow granular control over our components. If this only meant rendering - we would build Renderless components. However, we also want the consuming application to be able to override, modify and augment behavior.


The approach we have chosen to achieve this goal is to use a Vuex store.

  • Prerequisite: Both the consuming application and the library should import and use Vuex.

  • We first need to dynamically register our library as a module in the application's store. This is possible through the registerModule method


if(!this.$store.hasModule("ourlibrary")){
   this.$store.registerModule("ourlibrary", store);
}

  • Methods that need to be customizable are implemented as actions in a vuex module. Within the action, the behavior could vary:

  1. If we want the consuming application to be able to override behavior, the action first checks if a global action is available and invokes it. If not, the action proceeds to perform the default logic specified in the library.

  2. If we want the consuming application to augment behavior, the module action first performs the internal logic and then invokes the global action (or vice versa) to perform any augmentation as necessary.

Flow for Extending a Component Library using Vuex by FeldsparTech
Extending Component Library

Overriding behavior example

 overriddenMethod({dispatch},params){
    if(this._actions["overriddenMethod"]) {
       return dispatch("overriddenMethod", params, {root:true});
    } else {
      //Default behavior
    }
}


Augmenting behavior example

 augmentedMethod({dispatch},params){
     let response;
     /*
        Internal logic which updates `response`
        ...
     */
    if(this._actions["augmentedMethod"]) {
       globalResponse = dispatch("augmentedMethod", params, {root:true});
    }
    /*
        Update `response` with `globalResponse`
    */
    return response;
}

This pattern is quite powerful. For instance, you can now even allow the consuming application to entirely replace a particular nested component with one of its own.

Here, the vuex action functions as a Factory. Now you can customize the logic as per your needs. The Overriding approach will entirely replace default component. The Augmentation approach will allow the consuming application to add business-specific components you may not want in the library.


Dynamic Component in the Library

<template>
    <component v-if="currentComponent" v-bind:is="currentComponent"></component>
</template>
<script>
export {
    //...
    async mounted() {
      this.currentComponent = await this.$store.dispatch(`<module>/deriveComponent`)
    }
}
</script>


Action in Library's store

deriveComponent(context, params) {
    let currentComponent;
    //augment or override as per your requirements
    return currentComponent
    
}


Resources we found useful during this exercise

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