provide and inject in Vue
Vue interview exercise on Provide, inject & stores, difficulty 1 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Export ThemeKey (an InjectionKey for a Ref<string>), ThemeProvider with a prop `theme` (default "light") that provides it as a ref that follows the prop (toRef), rendering its default slot in a <div>; and ThemedButton with a prop `label` that injects the theme (defaulting to "light" when there is no provider, without a warning) and renders <button class="btn-<theme>">label</button>.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.