What is the Vue Composition API and how do I use it with TypeScript?

What is the Vue Composition API and how do I use it with TypeScript?

The Vue Composition API is a new way to organize and reuse logic in Vue components. It allows you to use functions to encapsulate state and behavior, making it easier to manage complex components. When using it with TypeScript, you can take advantage of type inference and interfaces to ensure type safety.

Can you show me a simple example of using the Composition API with TypeScript?

Sure! Here's a basic example:

import { ref, defineComponent } from 'vue';

export default defineComponent({
  setup() {
    const count = ref(0);
    const increment = () => { count.value++; };
    return { count, increment };
  }
});

In this example, count is a reactive reference, and increment is a function that updates count.

How does this differ from the Options API?

The Options API organizes code by options like data, methods, and lifecycle hooks, while the Composition API organizes code by logical concerns. This makes it easier to share and reuse code across components.

Are there any limitations when using TypeScript with the Composition API?

One limitation is that TypeScript may not always infer types correctly, especially with complex reactive structures. You might need to explicitly define types in some cases to ensure type safety.