A guide on leveraging Vue class components alongside the composition API in Vue2 using TypeScript

Question

A guide on leveraging Vue class components alongside the composition API in Vue2 using TypeScript

<script lang="ts">
import { Component, Vue } from 'vue-property-decorator'
import { CustomerContext, getCustomerRepository } from '@/composables/customerRepository'

@Component
export default class CustomerList extends Vue {
  search = ''

  setup(): CustomerContext {
    const ctx = getCustomerRepository()
    return ctx
  }
}
</script>

Exploring the use of the Composition API in Vue 2 with TypeScript and class component style. Unsure if the syntax is correct and encountering issues where the setup() function is not automatically invoked.

Questioning if vue-class-component can be used effectively with the Composition API in TypeScript.

typescript vue.js vuejs2 vue-composition-api

Answer 1

Answer №1

Vue 2

To start, ensure that you've added the @vue/composition-api plugin to your Vue 2 project:

// main.ts
import Vue from 'vue'
import VueCompositionApi from '@vue/composition-api'

Vue.use(VueCompositionApi)

Next, define the setup() function within a @Component option (instead of as a class method):

// MyComponent.vue
@Component({
  setup(props, context) {
    //...
  }
})
export default class CustomerList extends Vue {
  //...
}

Vue 3

For Vue 3, the

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7b0d0e1e5618171a08">[email protected]</a>

function provides a setup() API that should be assigned to a local variable:

<template>
  <div>counter: {{myContext.counter}}</div>
  <button @click="myContext.increment">Increment</button>
</template>

<script lang="ts">
import { Vue, setup } from 'vue-class-component'
import { ref } from 'vue'

export default class MyComponent extends Vue {
  myContext = setup(() => {
    const counter = ref(0)

    return {
      counter,
      increment() {
        counter.value++
      }
    }
  })
}
</script>

Please note: Starting from

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="205655450d434c41535352">[email protected]</a>

, the setup() function no longer receives any arguments, including the context and props parameters used in the Options API's setup().

Answer 2

Vue 2

To start, ensure that you've added the @vue/composition-api plugin to your Vue 2 project:

// main.ts
import Vue from 'vue'
import VueCompositionApi from '@vue/composition-api'

Vue.use(VueCompositionApi)

Next, define the setup() function within a @Component option (instead of as a class method):

// MyComponent.vue
@Component({
  setup(props, context) {
    //...
  }
})
export default class CustomerList extends Vue {
  //...
}

Vue 3

For Vue 3, the

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7b0d0e1e5618171a08">[email protected]</a>

function provides a setup() API that should be assigned to a local variable:

<template>
  <div>counter: {{myContext.counter}}</div>
  <button @click="myContext.increment">Increment</button>
</template>

<script lang="ts">
import { Vue, setup } from 'vue-class-component'
import { ref } from 'vue'

export default class MyComponent extends Vue {
  myContext = setup(() => {
    const counter = ref(0)

    return {
      counter,
      increment() {
        counter.value++
      }
    }
  })
}
</script>

Please note: Starting from

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="205655450d434c41535352">[email protected]</a>

, the setup() function no longer receives any arguments, including the context and props parameters used in the Options API's setup().

Answer 3

Answer №2

Create a setup using classes to support both Vue 2 and Vue 3

<template>
    <p>{{ counter.text }}</p>
</template>
<script lang="ts">
import { defineComponent } from 'vue';
import { Setup, Hook } from 'vue-class-setup';

@Setup
class Counter {
    public value = 0;
    public get text() {
        return String(this.value);
    }
    @Hook('mounted')
    public initialize() {
        this.value++;
    }
}

export default defineComponent({
    setup() {
        return {
            counter: new Counter()
        }
    }
})
</script>

Check out the source on GitHub

Answer 4

Create a setup using classes to support both Vue 2 and Vue 3

<template>
    <p>{{ counter.text }}</p>
</template>
<script lang="ts">
import { defineComponent } from 'vue';
import { Setup, Hook } from 'vue-class-setup';

@Setup
class Counter {
    public value = 0;
    public get text() {
        return String(this.value);
    }
    @Hook('mounted')
    public initialize() {
        this.value++;
    }
}

export default defineComponent({
    setup() {
        return {
            counter: new Counter()
        }
    }
})
</script>

Check out the source on GitHub

Answer 5

Answer №3

const Component = require('vue-class-component')
Component.hooks(['initialize'])

Insert this code snippet at the start of your program, and all functionality will operate as intended.

Answer 6

const Component = require('vue-class-component')
Component.hooks(['initialize'])

Insert this code snippet at the start of your program, and all functionality will operate as intended.

A guide on leveraging Vue class components alongside the composition API in Vue2 using TypeScript

Answer №1

Vue 2

Vue 3

Answer №2

Answer №3

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