---
title: "Vue Composition API Inspector"
url: https://daily.dev/posts/vue-composition-api-inspector-gca948uer
source_url: https://playfulprogramming.com/posts/vue-composition-inspector
type: article
source: "Playful Programming"
published: 2026-03-16T21:47:46.273Z
updated: 2026-03-16T21:55:47.307Z
tags: ["javascript", "typescript", "vuejs", "compiler"]
reading_time: 3
upvotes: 0
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Vue Composition API Inspector

**[Playful Programming](https://daily.dev/sources/playfulprogramming)** · 3 min read · 0 upvotes · 0 comments

## Summary

A developer migrating from Vue 2 Options API to Vue 3 Composition API with TypeScript explores how Vue's SFC compiler handles TypeScript generics in defineProps and defineEmits. Using Vue's compiler-sfc package (parse and compileScript functions), a small script is built to inspect how TypeScript type information is transformed into runtime JavaScript prop definitions. Key findings: primitives map one-to-one, TypeScript interfaces become { type: Object }, arrays become { type: Array }, and the optional ? modifier drives the required property.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://playfulprogramming.com/posts/vue-composition-inspector>

## Similar posts on daily.dev

- [The Journey to a Safer Frontend: Why We Removed React.FC](https://daily.dev/posts/the-journey-to-a-safer-frontend-why-we-removed-react-fc-yklcqqeyz) · Gusto Engineering · 69 upvotes · 1 comments
- [Typed Polymorphic React Component](https://daily.dev/posts/typed-polymorphic-react-component-qwqrzo59w) · Kitty says hi. · 67 upvotes · 1 comments

---

Tags: [#javascript](https://daily.dev/tags/javascript), [#typescript](https://daily.dev/tags/typescript), [#vuejs](https://daily.dev/tags/vuejs), [#compiler](https://daily.dev/tags/compiler)

[View this post on daily.dev](https://daily.dev/posts/vue-composition-api-inspector-gca948uer)