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TypeScript with Vue: Composition API and Types

Intermediate
120 XP
50 min
Lesson Content

TypeScript with Vue

Vue 3's Composition API works beautifully with TypeScript, providing excellent type inference and safety.

Typed Props

interface Props {
  title: string;
  count?: number;
}

const props = defineProps();

Typed Ref

import { ref } from 'vue';

const count = ref(0);
const user = ref(null);

Typed Reactive

import { reactive } from 'vue';

interface State {
  name: string;
  age: number;
}

const state = reactive({
  name: "John",
  age: 30
});

Typed Computed

const doubleCount = computed(() => count.value * 2);
Example Code

Practice Vue Composition API types (conceptual)

// Vue TypeScript example (conceptual)
// In real Vue:

interface Product {
  name: string;
  price: number;
}

// Simulate Vue ref
function createRef<T>(value: T) {
  return { value };
}

const product = createRef<Product>({ name: "Laptop", price: 999 });
console.log(`Product: ${product.value.name} - $${product.value.price}`);

Expected Output:

Product: Laptop - $999
Study Tips
  • •Read the theory content thoroughly before practicing
  • •Review the example code to understand key concepts
  • •Proceed to the Practice tab when you're ready to code