init commit

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+.DS_Store
+dist
+dist-ssr
+coverage
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+*.tsbuildinfo
+
+.eslintcache
+
+# Cypress
+/cypress/videos/
+/cypress/screenshots/
+
+# Vitest
+__screenshots__/
+
+# Vite
+*.timestamp-*-*.mjs

.oxfmtrc.json

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+{
+  "$schema": "./node_modules/oxfmt/configuration_schema.json",
+  "semi": false,
+  "singleQuote": true
+}

.vscode/extensions.json

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+{
+  "recommendations": [
+    "Vue.volar",
+    "vitest.explorer",
+    "oxc.oxc-vscode"
+  ]
+}

CHALLENGE.md

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+# Mock challenge: BaseButton component
+
+Build a reusable Vue 3 button component suitable for a design system. Focus on API design, accessibility, and Vue 3 best practices.
+
+**Suggested time: 25–35 minutes**
+
+---
+
+## Core requirements
+
+- Accept a `variant` prop: `primary`, `secondary`, `danger` — each should have visually distinct styles
+- Accept a `size` prop: `sm`, `md`, `lg` — affects padding and font size
+- Accept a `disabled` prop — visually and functionally disables the button
+- Accept a `loading` prop — shows a loading indicator and prevents interaction
+- Use a default `slot` for button label content
+- Explicitly declare a `click` emit
+
+---
+
+## Accessibility requirements
+
+- Use a native `<button>` element — not a `<div>`
+- When `loading` is true, set `aria-busy="true"` and `aria-disabled="true"`
+- When `disabled` is true, use the native `disabled` attribute (not just styling)
+- Ensure visible focus styles are not removed — `outline: none` without a replacement is a fail
+
+---
+
+## Bonus points
+
+- Add an optional `icon` slot for a leading icon
+- Type all props with TypeScript
+- Add a `full-width` prop that makes the button `width: 100%`
+- Write at least one Vitest unit test — e.g. that the click event does not fire when disabled
+
+---
+
+## Things they'll be watching for
+
+- Do you use `defineProps` and `defineEmits` correctly with script setup syntax?
+- Do you use a `computed` to derive CSS classes from props, or inline ternaries everywhere?
+- Do you handle the loading state gracefully — preventing double-clicks, communicating state to screen readers?
+- Do you narrate your thinking as you go?
+
+> **Tip:** Before writing any code, spend 1–2 minutes talking through your approach out loud. Interviewers value reasoning over speed.

README.md

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+# vue-practice
+
+This template should help get you started developing with Vue 3 in Vite.
+
+## Recommended IDE Setup
+
+[VS Code](https://code.visualstudio.com/) + [Vue (Official)](https://marketplace.visualstudio.com/items?itemName=Vue.volar) (and disable Vetur).
+
+## Recommended Browser Setup
+
+- Chromium-based browsers (Chrome, Edge, Brave, etc.):
+  - [Vue.js devtools](https://chromewebstore.google.com/detail/vuejs-devtools/nhdogjmejiglipccpnnnanhbledajbpd)
+  - [Turn on Custom Object Formatter in Chrome DevTools](http://bit.ly/object-formatters)
+- Firefox:
+  - [Vue.js devtools](https://addons.mozilla.org/en-US/firefox/addon/vue-js-devtools/)
+  - [Turn on Custom Object Formatter in Firefox DevTools](https://fxdx.dev/firefox-devtools-custom-object-formatters/)
+
+## Type Support for `.vue` Imports in TS
+
+TypeScript cannot handle type information for `.vue` imports by default, so we replace the `tsc` CLI with `vue-tsc` for type checking. In editors, we need [Volar](https://marketplace.visualstudio.com/items?itemName=Vue.volar) to make the TypeScript language service aware of `.vue` types.
+
+## Customize configuration
+
+See [Vite Configuration Reference](https://vite.dev/config/).
+
+## Project Setup
+
+```sh
+pnpm install
+```
+
+### Compile and Hot-Reload for Development
+
+```sh
+pnpm dev
+```
+
+### Type-Check, Compile and Minify for Production
+
+```sh
+pnpm build
+```
+
+### Run Unit Tests with [Vitest](https://vitest.dev/)
+
+```sh
+pnpm test:unit
+```

env.d.ts

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+/// <reference types="vite/client" />

index.html

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+<!DOCTYPE html>
+<html lang="">
+  <head>
+    <meta charset="UTF-8">
+    <link rel="icon" href="/favicon.ico">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Vite App</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>

package.json

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+{
+  "name": "vue-practice",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "run-p type-check \"build-only {@}\" --",
+    "preview": "vite preview",
+    "test:unit": "vitest",
+    "build-only": "vite build",
+    "type-check": "vue-tsc --build",
+    "format": "oxfmt src/"
+  },
+  "dependencies": {
+    "pinia": "^3.0.4",
+    "vue": "^3.5.32",
+    "vue-router": "^5.0.4"
+  },
+  "devDependencies": {
+    "@tsconfig/node24": "^24.0.4",
+    "@types/jsdom": "^28.0.1",
+    "@types/node": "^24.12.2",
+    "@vitejs/plugin-vue": "^6.0.6",
+    "@vue/test-utils": "^2.4.6",
+    "@vue/tsconfig": "^0.9.1",
+    "jsdom": "^29.0.2",
+    "npm-run-all2": "^8.0.4",
+    "oxfmt": "^0.45.0",
+    "typescript": "~6.0.0",
+    "vite": "^8.0.8",
+    "vite-plugin-vue-devtools": "^8.1.1",
+    "vitest": "^4.1.4",
+    "vue-tsc": "^3.2.6"
+  },
+  "engines": {
+    "node": "^20.19.0 || >=22.12.0"
+  }
+}

src/App.vue

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+<template>
+  <div class="button-group">
+
+    <MyButton variant="primary"
+              size="sm">
+      Primary Small
+    </MyButton>
+    <MyButton variant="secondary"
+              size="md">
+      Secondary Medium
+    </MyButton>
+    <MyButton variant="danger"
+              size="lg">
+      Danger Large
+    </MyButton>
+
+    <MyButton variant="danger"
+              size="lg"
+              :loading="true">
+      Danger Large
+    </MyButton>
+
+    <MyButton variant="danger"
+              size="lg"
+              :disabled="true">
+      Danger Large
+    </MyButton>
+  </div>
+</template>
+
+<script setup lang="ts">
+import MyButton from './components/MyButton.vue';
+
+</script>
+<style scoped>
+.button-group {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+}
+</style>

src/__tests__/App.spec.ts

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+import { describe, it, expect } from 'vitest'
+
+import { mount } from '@vue/test-utils'
+import App from '../App.vue'
+
+describe('App', () => {
+  it('mounts renders properly', () => {
+    const wrapper = mount(App)
+    expect(wrapper.text()).toContain('You did it!')
+  })
+})

src/components/MyButton.vue

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+<template>
+  <button class="btn"
+          type="button"
+          :aria-busy="loading"
+          :class="classes"
+          :disabled="disabled || loading">
+    <template v-if="loading">
+      Loading...
+    </template>
+
+    <template v-else>
+      <span v-if="icon">
+        <!-- icon placeholder -->
+      </span>
+      <slot></slot>
+    </template>
+  </button>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+
+interface ButtonProps {
+  disabled?: boolean
+  icon?: string
+  loading?: boolean
+  size: 'sm' | 'md' | 'lg'
+  variant: 'primary' | 'secondary' | 'danger'
+}
+
+const {
+  variant = "primary",
+  size = "md",
+  disabled = false,
+  loading = false
+} = defineProps<ButtonProps>()
+
+const emit = defineEmits(['click'])
+
+const classes = computed(() => [
+  `btn--${variant}`,
+  `btn--${size}`
+])
+</script>
+
+<style scoped>
+.btn {
+  --background-color: navy;
+  --border-radius: 0.25rem;
+  --cursor-type: pointer;
+  --text-color: white;
+  --text-size: 1rem;
+  --horizontal-padding: 0.75rem;
+  --vertical-padding: 0.5rem;
+
+  background: var(--background-color);
+  border: 1px solid transparent;
+  border-radius: var(--border-radius);
+  color: var(--text-color);
+  cursor: var(--cursor-type);
+  font-size: var(--text-size);
+  padding-block: var(--vertical-padding);
+  padding-inline: var(--horizontal-padding);
+
+  &:focus-visible {
+    outline: 2px dashed CanvasText;
+    outline-offset: 2px;
+  }
+
+  &.btn--secondary {
+    --background-color: green;
+  }
+
+  &.btn--danger {
+    --background-color: red;
+  }
+
+  &.btn--sm {
+    --border-radius: 0.15rem;
+    --text-size: 0.825rem;
+    --vertical-padding: 0.25rem;
+    --horizontal-padding: 0.5rem;
+  }
+
+  &.btn--lg {
+    --text-size: 1.25rem;
+    --vertical-padding: 0.75rem;
+    --horizontal-padding: 1rem;
+    --border-radius: 0.5rem;
+  }
+
+  &[aria-busy="true"] {
+    opacity: 0.5;
+  }
+
+  &[disabled] {
+    --background-color: gray;
+    --cursor-type: not-allowed;
+    --text-color: black;
+  }
+}
+</style>

src/main.ts

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+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+
+import App from './App.vue'
+import router from './router'
+
+const app = createApp(App)
+
+app.use(createPinia())
+app.use(router)
+
+app.mount('#app')

src/router/index.ts

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+import { createRouter, createWebHistory } from 'vue-router'
+
+const router = createRouter({
+  history: createWebHistory(import.meta.env.BASE_URL),
+  routes: [],
+})
+
+export default router

src/stores/counter.ts

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+import { ref, computed } from 'vue'
+import { defineStore } from 'pinia'
+
+export const useCounterStore = defineStore('counter', () => {
+  const count = ref(0)
+  const doubleCount = computed(() => count.value * 2)
+  function increment() {
+    count.value++
+  }
+
+  return { count, doubleCount, increment }
+})

tsconfig.app.json

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+{
+  "extends": "@vue/tsconfig/tsconfig.dom.json",
+  "include": ["env.d.ts", "src/**/*", "src/**/*.vue"],
+  "exclude": ["src/**/__tests__/*"],
+  "compilerOptions": {
+    // Extra safety for array and object lookups, but may have false positives.
+    "noUncheckedIndexedAccess": true,
+
+    // Path mapping for cleaner imports.
+    "paths": {
+      "@/*": ["./src/*"]
+    },
+
+    // `vue-tsc --build` produces a .tsbuildinfo file for incremental type-checking.
+    // Specified here to keep it out of the root directory.
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo"
+  }
+}

tsconfig.json

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+{
+  "files": [],
+  "references": [
+    {
+      "path": "./tsconfig.node.json"
+    },
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.vitest.json"
+    }
+  ]
+}

tsconfig.node.json

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+// TSConfig for modules that run in Node.js environment via either transpilation or type-stripping.
+{
+  "extends": "@tsconfig/node24/tsconfig.json",
+  "include": [
+    "vite.config.*",
+    "vitest.config.*",
+    "cypress.config.*",
+    "playwright.config.*",
+    "eslint.config.*"
+  ],
+  "compilerOptions": {
+    // Most tools use transpilation instead of Node.js's native type-stripping.
+    // Bundler mode provides a smoother developer experience.
+    "module": "preserve",
+    "moduleResolution": "bundler",
+
+    // Include Node.js types and avoid accidentally including other `@types/*` packages.
+    "types": ["node"],
+
+    // Disable emitting output during `vue-tsc --build`, which is used for type-checking only.
+    "noEmit": true,
+
+    // `vue-tsc --build` produces a .tsbuildinfo file for incremental type-checking.
+    // Specified here to keep it out of the root directory.
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo"
+  }
+}

tsconfig.vitest.json

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+{
+  "extends": "./tsconfig.app.json",
+
+  // Override to include only test files and clear exclusions.
+  // Application code imported in tests is automatically included via module resolution.
+  "include": ["src/**/__tests__/*", "env.d.ts"],
+  "exclude": [],
+
+  "compilerOptions": {
+    // Vitest runs in a different environment than the application code.
+    // Adjust lib and types accordingly.
+    "lib": [],
+    "types": ["node", "jsdom"],
+
+    // `vue-tsc --build` produces a .tsbuildinfo file for incremental type-checking.
+    // Specified here to keep it out of the root directory.
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.vitest.tsbuildinfo"
+  }
+}

vite.config.ts

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+import { fileURLToPath, URL } from 'node:url'
+
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import vueDevTools from 'vite-plugin-vue-devtools'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [
+    vue(),
+    vueDevTools(),
+  ],
+  resolve: {
+    alias: {
+      '@': fileURLToPath(new URL('./src', import.meta.url))
+    },
+  },
+})

vitest.config.ts

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+import { fileURLToPath } from 'node:url'
+import { mergeConfig, defineConfig, configDefaults } from 'vitest/config'
+import viteConfig from './vite.config'
+
+export default mergeConfig(
+  viteConfig,
+  defineConfig({
+    test: {
+      environment: 'jsdom',
+      exclude: [...configDefaults.exclude, 'e2e/**'],
+      root: fileURLToPath(new URL('./', import.meta.url)),
+    },
+  }),
+)