Intuitive, type safe and flexible MVVM implementation for nuxt based applications

Features

• ⛰️ Nuxt3 ready
• ⚙️ SSR support
• 💉 Dependency injection
• 📦 Extremely light

Setup

Add as dependency

pnpm add nuxt-mvvm && pnpm add tsyringe -D

import {defineNuxtConfig} from 'nuxt'


export default defineNuxtConfig({
    modules: ['nuxt-mvvm']
})

Usage

1. Simple usage

Create view-model

@ViewModel()
class MyViewModel extends BaseViewModel {
    constructor() {
        super();
        this.counter = 0;
    }

    public increment() {
        this.counter++;
    }
}

And just use it

<template>
	<button @click="vm.increment()">
		count: {{vm.counter}}
	</button>
</template>

<script setup lang="ts">
	import {useVm} from '#imports';


	const vm = useVm(MyViewModel);
</script>

2. Usage with services

Create service

class CounterService {
    constructor() {
        this.value = 0;
    }

    public increment() {
        this.value++;
    }
}

Inject service

@ViewModel()
class MyViewModel extends BaseViewModel {
    constructor(
        @injectDep(CounterService) public readonly counter: CounterService
    ) {
        super();
    }
}

Use it with service

<template>
	<button @click="vm.counter.increment()">
		count: {{ vm.counter.value }}
	</button>
</template>

<script setup lang="ts">
	import {useVm} from '#imports';


	const vm = useVm(MyViewModel);
</script>

3. Control lifecycle

You can specify life cycle hook via IMountable ISetupable, IUnmountable interfaces or just use union interface ILifeCycle that contains all possible life cycle hooks.

@ViewModel()
class MyViewModel extends BaseViewModel implements IMountable, ISetupable, IUnmountable /* or implements ILifeCycle */ {
    constructor() {
        super();
    }

    public onMount() {
        // calls on view mounting
    }

    public onSetup() {
        // calls on view setup
    }

    public onUnmount() {
        // calls on view unmounting
    }
}

4. Routing

The BaseViewModel encompasses router and route variables, which are equivalents of useRouter and useRoute.

@ViewModel()
class MyViewModel extends BaseViewModel {
    constructor() {
        super();
    }

    public redirect() {
        this.router.push('/');
    }
    
    public get currentRouteFullPath() {
        return this.route.fullPath;
    }
}

Life cycle interfaces:

• IMountable
• IBeforeMountable
• ISetupable
• IUnmountable
• IBeforeUnmountable
• ICaptureError
• IUpdatable
• IRenderTrackable
• IRenderTriggerable
• IDeactivatable
• IActivatable
• IServicePrefetchable

Router interfaces:

• IRouterable

Decorators

1. ViewModel - Labels a class as a view-model. Apply this decorator when the class represent a screen or a component.
2. injectDep - Injects a dependency into a view-model.
3. ~~ScreenVm - Signifies that the class is a screen view-model.~~ (deprecated)
4. ~~ComponentVm - Identifies a class as a component view-model.~~ (deprecated)

Reusable Composition Functions

1. useVm - Function to generate view-model instance
2. useChildVm - Function to utilize an instance of previously created view-model

Establishment of a base view-model

/**
 * Every view-model must inherit from the BaseViewModel class and be decorated with the @ViewModel, or @ScreenVm, or @ComponentVm decorator.
 */
@ViewModel()
class ViewModel extends BaseViewModel {
    constructor() {
        super();
    }
}