Q: What is async setup and top-level await?

**Target Audience:** Developers using <script setup> who want to load data with await and need to know what that changes. **Difficulty:** Hard > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. The compiled output came from @vue/compiler-sfc 3.5.44's compileScript . The runtime traces came from a Vitest 5.0.5 test

Question 1

What is Vue template syntax (interpolation, directives, expressions)?

Accepted Answer

**Target Audience:** Beginners who know basic HTML and JavaScript and are reading Vue templates for the first time. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the precise vocabulary. Every rendered output, compiled render function, warning and error message below was produced by running the code on Vue 3.5.44 (@vue/compiler-dom for compiler output, the repo verifier for mounted components). ## 1. Why Th

Question 2

How do you handle errors in Vue (onErrorCaptured, app.config.errorHandler)?

Accepted Answer

**Target Audience:** Anyone preparing for a Vue interview who knows [the component lifecycle](/interview-question/what-are-vue-lifecycle-hooks) — no error-monitoring experience required. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Every output was produced on Vue 3.5.44: the propagation scripts ran in Node with jsdom, once in development an

Question 3

How do you handle forms and validation in Vue?

Accepted Answer

**Target Audience:** Anyone preparing for a Vue interview who knows [how v-model works on inputs](/interview-question/how-does-v-model-work-on-form-inputs) — no form library experience required. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Every output was produced on Vue 3.5.44 by mounting the components in jsdom with the repo verifier and

Question 4

How do you use TypeScript with Vue (typed props, emits, refs, vue-tsc)?

Accepted Answer

**Target Audience:** Vue developers adopting TypeScript, or TypeScript developers new to Vue's single file components.
**Difficulty:** Medium

> **How to read this doc:** Plain language first, then `📌 Interview term:` callouts. Every type error below is real output from `vue-tsc` 3.3.13 with TypeScript 5.9 and `strict: true`; compiled output comes from `@vue/compiler-sfc` 3.5.44; runtime behaviour and warnings come from mounting the components in jsdom on Vue 3.5.44; the `vite build` result is

Question 5

How do you fetch data in a Vue component (loading, errors, cancellation)?

Accepted Answer

**Target Audience:** Anyone preparing for a Vue interview who knows [watch and watchEffect](/interview-question/what-is-the-difference-between-watch-and-watcheffect) and basic fetch — no data-fetching library required. **Difficulty:** Medium > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. All output was produced on Vue 3.5.44. **No real network was used*

Question 6

How do you add global properties or config?

Accepted Answer

**Target Audience:** Vue developers setting up an app's entry file, or migrating `Vue.prototype` code from Vue 2.
**Difficulty:** Medium

> **How to read this doc:** Plain language first, then `📌 Interview term:` callouts. The runtime output below came from bundling the example (`main.js` plus three SFCs) with esbuild and running it in jsdom on Vue 3.5.44; the TypeScript errors came from `vue-tsc` 3.3.13 with `strict: true`.

## 1. Why This Even Matters — A Story First

Think of an office build

Question 7

How do generic <script setup> components work (generic="T")?

Accepted Answer

**Target Audience:** Vue and TypeScript developers who build reusable components such as lists, tables and selects.
**Difficulty:** Hard

> **How to read this doc:** Plain language first, then `📌 Interview term:` callouts. All type errors below are real output from `vue-tsc` 3.3.13 (TypeScript 5.9, `strict: true`) run on the example files; the compiled output comes from `@vue/compiler-sfc` 3.5.44; the runnable example was mounted in jsdom on Vue 3.5.44.

## 1. Why This Even Matters — A Story Fi

Question 8

What is async setup and top-level await?

Accepted Answer

**Target Audience:** Developers using

Question 9

What is Suspense in Vue?

Accepted Answer

**Target Audience:** Developers who know components and promises and want to understand Vue's built-in way of coordinating async loading. **Difficulty:** Hard > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. Every trace below was produced by compiling and mounting the code on Vue 3.5.44 in jsdom (or rendering it with --ssr) using the repo's verify-v

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