Mastering Vue 3 with TypeScript: Class-Based Components & Mixins
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Chapter 1: Introduction to Class-Based Components
When working with Vue, one can opt for class-based components through its API. This approach offers a structured way to build applications that some developers may find more intuitive.
In this article, we will explore how to develop Vue applications utilizing class-based components and mixins.
Section 1.1: Understanding Mixins
Mixins allow us to enhance class-based components in Vue. By leveraging the mixins function, we can create reusable pieces of code that can be shared across components. For example, we can define mixins for both Hello and World class components.
This way, properties from the Hello and World classes become accessible within the Helloworld component class. To utilize these properties, we can reference them through the this object in our class. Additionally, they can be accessed directly in the template.
However, it’s important to note that we cannot use arrow functions as methods in our component class. This is because arrow functions do not bind to the this context, which can lead to unintended consequences. For instance, if we attempt to write:
bar() {
this.foo = 42; // This will not work as expected
}
In this case, bar will not successfully update foo since this does not refer to the class instance.
Subsection 1.1.1: Constructors and Vue Lifecycle
It is advisable to avoid adding constructors in our class components, as they are not compatible with the Vue lifecycle. For instance, attempting to access reactive properties inside a constructor will result in an error.
Section 1.2: Creating Class Components with TypeScript
TypeScript can be employed to create class-based components in Vue. For example, we can structure our components like this:
// src/components/HelloWorld.vue
// src/App.vue
Additionally, our tsconfig.json file should include the following:
{
"compilerOptions": {
"esModuleInterop": true}
}
Setting compilerOptions.esModuleInterop to true allows us to import ES modules seamlessly. In App.vue, we will register the HelloWorld component. Within HelloWorld.vue, we utilize Vue.extend to define the GreetProps class with its props. By employing the extends keyword, we can create a subclass that accepts a name prop, enabling us to display a message retrieved via a getter in the template.
Chapter 2: Conclusion
In conclusion, utilizing class-based components in Vue alongside TypeScript and mixins offers a powerful way to organize code within your projects. This approach not only enhances readability but also promotes reusability across components.
The first video, "Vue 3 with TypeScript Tutorial #1 - Intro & Setup," provides an insightful introduction to setting up Vue 3 with TypeScript, ideal for beginners looking to get started.
The second video, "How to use a Mixin in Vue 3 | Shared script code across multiple components," explains how to effectively implement mixins in Vue 3, showcasing how to share script code across components.