TypeScript & Vue.js

In this tutorial, we will explore how to use TypeScript with Vue.js to build strongly typed components, improving code quality and maintainability.

TypeScript with Vue.js

Vue.js has built-in support for TypeScript, which makes it easier to incorporate TypeScript's strong typing capabilities when building components. By typing your component's data, props, computed properties, and methods, you can catch errors at compile-time, reducing runtime errors and making your code more maintainable.

Creating a Typed Component

To create a typed component in Vue.js, define an interface or type for the component's props, and use TypeScript's class syntax with the Vue base class and the @Component decorator.

First, install vue-class-component and vue-property-decorator:

npm install vue-class-component vue-property-decorator

TypeScript

import Vue from 'vue';
import { Component, Prop } from 'vue-property-decorator';

interface CounterProps {
  startCount: number;
}

@Component
export default class CounterComponent extends Vue implements CounterProps {
  @Prop({ default: 0 }) startCount!: number;
  count: number = this.startCount;

  increment(): void {
    this.count++;
  }
}

In this example, we define a CounterComponent that receives a startCount prop and maintains a count data property. It also has an increment method. By implementing the CounterProps interface, we ensure that the component uses the correct types for properties and methods.

Using the Typed Component

To use the typed component, add it to your Vue.js application, and include it in a template with the proper bindings.

HTML

<template>
  <div>
    <counter-component :start-count="10"></counter-component>
  </div>
</template>

<script lang="ts">
  import Vue from 'vue';
  import CounterComponent from './CounterComponent.vue';

  export default Vue.extend({
    components: {
      CounterComponent,
    },
  });
</script>

In this example, we use the CounterComponent in our main application and pass it a startCount prop of 10.

Conclusion

In this tutorial, we have explored how to use TypeScript with Vue.js to build strongly typed components, improving code quality and maintainability. As you continue learning TypeScript and Vue.js, consider using TypeScript to enforce strong typing and reduce errors in your Vue.js projects.