TypeScript Props in Vue

Typing Props

Prefer type-based defineProps with withDefaults for optional values.

Runtime declarations remain useful when you need validators.

const props = withDefaults(defineProps<{ count?: number }>(), { count: 0 })

Defaults with typed props.

Complex Props

unions, object types, generic components (advanced)

• Handle loading and errors.
• Keep composables tested.
• Prefer TypeScript when you can.
• Measure before optimizing.

TypeScript Props in Vue Cheatsheet

Quick reference for patterns covered in this lesson.

Avoid Prop Drilling Types Pain

If types get huge, redesign the component API.

Common Mistakes

• Optional props that are required logically.
• Mutable props.

Key Takeaways

• TypeScript Props in Vue shows up often in Vue apps.
• Practice with a demo.
• Prefer clear APIs.
• Read official docs for edge cases.