Using Vue and TypeScript to define components

Question

Using Vue and TypeScript to define components

Whenever I attempt to install vue-class-component, vue-class-component, or vue-property-decorator, I encounter the following error message:

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e7829f868a978b82a7d7c9d7c9d7">[email protected]</a>
npm ERR! Found: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="fb8d8e9ebbc8d5cfd5ce">[email protected]</a>
npm ERR! node_modules/vue
npm ERR!   vue@"^3.3.11" from the root project
npm ERR!   peer vue@"*" from <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c9bfbcace4b9bba6b9acbbbdb0e4adacaaa6bba8bda6bb89f0e7f8e7fb">[email protected]</a>
npm ERR!   node_modules/vue-property-decorator
npm ERR!     vue-property-decorator@"*" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer vue@"^2.0.0" from <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="631516064e000f0210104e000c0e130c0d060d1723544d514d55">[email protected]</a>
npm ERR! node_modules/vue-class-component
npm ERR!   peer vue-class-component@"*" from <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="92e4e7f7bfe2e0fde2f7e0e6ebbff6f7f1fde0f3e6fde0d2abbca3bca0">[email protected]</a>
npm ERR!   node_modules/vue-property-decorator
npm ERR!     vue-property-decorator@"*" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

This is perplexing: It mentions I have

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6315160623504d574d56">[email protected]</a>

, but the packages necessitate at least versions 3.3.11 and 2.0.0, which renders them unattainable. However, doesn't "at least" imply they should work?

<template>
    <p :title="computedText">{{ computedText }}</p>
</template>

<script lang="ts">
import { Component, Vue } from "vue-property-decorator";

@Component
export default class Example extends Vue {
   private text = 'Hello World!'

   public get computedText(): string { return this.text }
}
</script>

I also attempted using defineComponent, which imports successfully. However, I encountered issues accessing the definitions within the template:

<template>
    <p :title="computedText">{{ computedText }}</p>
</template>

<script lang="ts">
import { defineComponent } from 'vue'

defineComponent({
    data() {
        return {
            text: 'Hello World!'
        }
    },
    computed: {
        computedText(): string { return this.text }
    }
})
</script>

Overall, I am quite perplexed about the correct approach to utilizing TypeScript with Vue.

typescript vue.js

Answer 1

Answer №1

In Vue 3, it is advised to use the second syntax as the first one is not recommended by the Vue core team due to its lack of compatibility with the composition API.

Class API usage is no longer recommended in Vue 3. Instead, the Composition API offers better TypeScript integration, logic reusability, and code organization benefits.

Although the second syntax is correct, there is no need to explicitly declare types as they are automatically inferred. Remember that computed properties should always return a value:

<template>
    <p :title="computedText">{{ computedText }}</p>
</template>

<script lang="ts">
import { defineComponent } from 'vue'

defineComponent({
    data() {
        return {
            text: 'Hello World!'
        }
    },
    computed: {
        computedText(){ //here the computedText has type string inferred
           return this.text;
        }
    }
})
</script>

While the above syntax is still valid in Vue 3, it is recommended to use the composition API with the script setup:

<template>
    <p :title="computedText">{{ computedText }}</p>
</template>

<script lang="ts" setup>
import { ref, computed} from 'vue'

const text = ref('Hello World!')

const computedText = computed(()=>text.value)
 
</script>

Answer 2

In Vue 3, it is advised to use the second syntax as the first one is not recommended by the Vue core team due to its lack of compatibility with the composition API.

Class API usage is no longer recommended in Vue 3. Instead, the Composition API offers better TypeScript integration, logic reusability, and code organization benefits.

Although the second syntax is correct, there is no need to explicitly declare types as they are automatically inferred. Remember that computed properties should always return a value:

<template>
    <p :title="computedText">{{ computedText }}</p>
</template>

<script lang="ts">
import { defineComponent } from 'vue'

defineComponent({
    data() {
        return {
            text: 'Hello World!'
        }
    },
    computed: {
        computedText(){ //here the computedText has type string inferred
           return this.text;
        }
    }
})
</script>

While the above syntax is still valid in Vue 3, it is recommended to use the composition API with the script setup:

<template>
    <p :title="computedText">{{ computedText }}</p>
</template>

<script lang="ts" setup>
import { ref, computed} from 'vue'

const text = ref('Hello World!')

const computedText = computed(()=>text.value)
 
</script>

Using Vue and TypeScript to define components

Answer №1

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