Top 30 Frontend Dev Latest Updates Quiz

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1. Question 1 of 30

   What is the primary benefit of using createUseFetch over ad-hoc useFetch wrappers?

   • aIt removes the need for unplugin-vue-router and makes route generation deterministic.
   • bIt enables layouts to receive typed per-page parameters without provide/inject workarounds.
   • cIt lets you bake baseURL, interceptors, and server flags into reusable, fully typed composables that remain SSR-compatible.
   • dIt reduces dev-server route recalculation time by up to 28x when editing existing pages.
   Show the answer

   Answer: c · It lets you bake baseURL, interceptors, and server flags into reusable, fully typed composables that remain SSR-compatible.

   createUseFetch is designed to cut API boilerplate by embedding baseURL, interceptors, and server flags into reusable, fully typed composables that remain SSR-safe. Distractor B describes the Vue Router v5 upgrade's impact on dev-server performance, not fetch factories.

   Read the full bite: Nuxt 4.4 Adds Custom Fetch Factories and Router v5

2. Question 2 of 30

   Why is it significant that Nuxt Agent shares its MCP server with tools like Cursor and Claude Desktop?

   • aIt ensures the structured docs and issue data used on nuxt.com matches what developers query locally
   • bIt means the agent can read the user's local file system to debug projects
   • cIt lets the agent deploy Nuxt apps directly to production providers
   • dIt reduces the number of API calls needed to render StackBlitz playgrounds
   Show the answer

   Answer: a · It ensures the structured docs and issue data used on nuxt.com matches what developers query locally

   The card states that using the same MCP server means the structured data feeding local AI assistants is identical to the one powering the official site, which closes the gap between reading docs and reproducing bugs. Distractor B misinterprets shared MCP infrastructure as local file system access, whereas the card emphasizes synchronized data sources, not local environment control.

   Read the full bite: Nuxt Agent beta replaces docs chat with MCP assistant

3. Question 3 of 30

   How does Turbopack's Server Fast Refresh in Next.js 16.2 differ from the previous server-side reload behavior?

   • aIt clears require.cache for changed files while preserving untouched node_modules, cutting overhead by about two-thirds.
   • bIt applies tree-shaking to dynamic imports during reload so that only used exports are invalidated instead of the full module graph.
   • cIt reloads only the changed module and leaves the rest of the server process intact, rather than clearing the require.cache for the entire import chain.
   • dIt moves server compilation into Web Workers with corrected origins to isolate changes from the main Node.js process.
   Show the answer

   Answer: c · It reloads only the changed module and leaves the rest of the server process intact, rather than clearing the require.cache for the entire import chain.

   Turbopack now surgically reloads only the changed module while leaving the server process intact, replacing the old behavior of clearing require.cache for the changed file and its entire import chain. Option A is tempting because it mentions require.cache and node_modules, but the old system actually cleared untouched node_modules in the import chain, and the new approach avoids chain-wide cache clearing entirely.

   Read the full bite: Next.js 16.2 brings 67-100% faster server Fast Refresh

4. Question 4 of 30

   Which change to Vue's template parser in 3.4 is primarily responsible for its 2× speed improvement?

   • aIt delegates parsing to htmlparser2 while keeping the old regex-based tokenizer
   • bIt replaced recursive descent and heavy regex with a single-pass state-machine tokenizer
   • cIt added look-ahead caching to the existing recursive descent approach
   • dIt skips source-map generation during single-file component compilation
   Show the answer

   Answer: b · It replaced recursive descent and heavy regex with a single-pass state-machine tokenizer

   The card states the parser was rewritten from a recursive descent approach relying on heavy regex to a state-machine tokenizer based on htmlparser2 that iterates only once. Option A is tempting because it mentions htmlparser2, but the old regex-based tokenizer was fully replaced, not retained.

   Read the full bite: Vue 3.4 Cuts Build Times 44%, Stabilizes defineModel

5. Question 5 of 30

   How does Firefox 151's Web Serial API allow web apps to handle hardware tasks previously requiring native installers?

   • aBy including a built-in polyfill that translates Chromium Web Serial calls for Firefox
   • bBy routing hardware commands through a Mozilla-signed background service
   • cBy automatically enumerating all serial ports when a site loads
   • dBy letting JavaScript read and write directly to USB serial devices after explicit user permission
   Show the answer

   Answer: d · By letting JavaScript read and write directly to USB serial devices after explicit user permission

   Firefox 151 implements the Web Serial API natively, so JavaScript can call navigator.serial.requestPort() to access hardware directly after the user explicitly grants permission, removing the need for native binaries. Distractor A is wrong because sites cannot silently probe ports—the permission model requires an explicit grant per site and port.

   Read the full bite: Firefox 151 Ships Web Serial API for Hardware

6. Question 6 of 30

   What is the primary risk when React teams adopt TypeScript without standardized prop and hook typing patterns?

   • aStackBlitz and Gitpod environments fail to compile forwarded refs
   • bCode review slows due to style debates and type safety erodes from inconsistent patterns
   • cComponentProps forces manual re-declaration of all HTML element props
   • dReact's built-in type definitions become incompatible with custom hooks
   Show the answer

   Answer: b · Code review slows due to style debates and type safety erodes from inconsistent patterns

   The card warns that poor typing leads to verbose code, suppressed errors, and code review debates about style rather than logic. Option C is wrong because ComponentProps is introduced to eliminate verbose manual re-declaration, not require it.

   Read the full bite: Matt Pocock's Free React TypeScript Tutorial

7. Question 7 of 30

   For which file is //# allFunctionsCalledOnLoad the most appropriate optimization?

   • aEvery script on a page to ensure all compilation happens off the main thread
   • bA lazily-loaded module that splits code to reduce initial bundle size
   • cA core entry-point bundle whose functions execute during initial page load
   • dA large utility library fetched during page load but only used after user interaction
   Show the answer

   Answer: c · A core entry-point bundle whose functions execute during initial page load

   The hint is designed for known startup files so V8 can compile them in the background during network load. Using it on all scripts (A) or on non-startup files (A, D) wastes CPU and memory without improving startup time.

   Read the full bite: Chrome 136 cuts JS startup 630ms with compile hints

8. Question 8 of 30

   What condition forces V8's JSON.stringify to abandon its new side-effect-free fast path and use the slower recursive serializer?

   • aOne of the properties defines a custom toJSON method
   • bThe object graph nests deeper than the previous recursive stack limit
   • cThe object was created with Object.create(null)
   • dString values contain two-byte Unicode characters
   Show the answer

   Answer: a · One of the properties defines a custom toJSON method

   Custom toJSON methods execute user code during serialization, violating the side-effect-free guarantee required for the fast path. Deep nesting is actually improved by the iterative fast path, while Unicode strings and null-prototype objects do not inherently trigger the slower recursive serializer.

   Read the full bite: V8 doubles JSON.stringify speed with side-effect-free fast path

9. Question 9 of 30

   What is the significance of Vercel using the same public Adapter API contract as third-party platforms?

   • aThird-party platforms can achieve full framework fidelity without relying on reverse-engineered internals.
   • bAll platforms are required to use an identical runtime configuration generated by modifyConfig.
   • cVercel must submit adapter changes to the Ecosystem Working Group before deployment.
   • dVercel has open-sourced its adapter so platforms can replicate previously private build logic.
   Show the answer

   Answer: a · Third-party platforms can achieve full framework fidelity without relying on reverse-engineered internals.

   The correct answer is B because the card emphasizes that the public contract allows any platform to target the same framework fidelity as Vercel without reverse-engineering build output. Option D is tempting because Vercel did open-source its adapter, but the card explicitly states there are no private hooks, so there was no secret build logic to replicate.

   Read the full bite: Next.js 16.2 ships stable Adapter API for all platforms

10. Question 10 of 30

    Which scenario best describes the supply-chain vulnerability WAICT is designed to prevent in encrypted web apps?

    • aA compromised server selectively serves modified JavaScript to specific users to exfiltrate keys
    • bA developer publishes a broken build that accidentally leaks plaintext messages
    • cAn attacker intercepts network traffic and replaces JavaScript en route to the user
    • dA browser extension injects malicious code after the page has finished loading
    Show the answer

    Answer: a · A compromised server selectively serves modified JavaScript to specific users to exfiltrate keys

    The card explains that WAICT stops compromised servers from silently injecting malicious JavaScript to specific users, which breaks end-to-end encryption. Option C describes a man-in-the-middle attack that TLS already prevents, whereas WAICT closes the trust gap that TLS and SRI leave open.

    Read the full bite: Mozilla WAICT Verifies Web App JavaScript in Nightly

11. Question 11 of 30

    When an app running on Vercel requests a provider token through Vercel Connect at runtime, how does it prove its identity?

    • aBy prompting the user for an OAuth consent flow on each request
    • bBy sending a long-lived Vercel API token from the project settings
    • cBy presenting a static provider secret stored in environment variables
    • dBy using the OIDC identity that every Vercel deployment automatically receives
    Show the answer

    Answer: d · By using the OIDC identity that every Vercel deployment automatically receives

    Vercel Connect uses the deployment's built-in OIDC identity to exchange for short-lived provider tokens, eliminating persistent secrets. Static env vars (C) are the legacy approach, and while per-user consent flows (A) may come later, they are not the current runtime mechanism.

    Read the full bite: Vercel Connect replaces env tokens with runtime OIDC

12. Question 12 of 30

    When debugging a Nuxt 4 edge case, why would you branch a Nuxi answer instead of continuing in the same chat?

    • aTo make the conversation public so teammates can view your debugging steps.
    • bTo explore a tangent or compare an alternative solution without losing the original thread.
    • cTo sync the new thread across your devices using GitHub authentication.
    • dTo increase your daily message limit for complex debugging sessions.
    Show the answer

    Answer: b · To explore a tangent or compare an alternative solution without losing the original thread.

    Branching creates a forked thread from a specific answer so you can explore tangents or compare solutions while leaving the original conversation intact. Option A confuses branching with the privacy toggle, and option C describes the benefit of GitHub sign-in rather than branching.

    Read the full bite: Nuxt ships Nuxi AI agent with context-aware docs help

13. Question 13 of 30

    According to Dodds, what is the best response when vector search misses exact identifiers like 'React Testing Library'?

    • aFine-tune the embedding model exclusively on technical documentation
    • bSwitch to a more powerful embedding model with a larger context window
    • cAdd a BM25 lexical layer and merge results with Reciprocal Rank Fusion
    • dAbandon vector search and rely solely on a SQLite FTS5 index
    Show the answer

    Answer: c · Add a BM25 lexical layer and merge results with Reciprocal Rank Fusion

    Dodds kept his existing vector pipeline and augmented it with SQLite FTS5 BM25 search, merging both result sets via Reciprocal Rank Fusion, because embedding models inherently optimize for conceptual meaning rather than exact string matches. Simply scaling up the embedding model or switching entirely to lexical search would not solve the hybrid retrieval problem.

    Read the full bite: Kent C. Dodds Adds SQLite FTS5 to Vector Search

14. Question 14 of 30

    How does VitePress 1.0 optimize documentation sites for both search engine indexing and fast subsequent page navigation?

    • aIt pre-fetches all site chunks during the initial load to eliminate any later network requests.
    • bIt generates static HTML at build time for SEO, then hydrates into a Vue 3 SPA for instant client-side navigation.
    • cIt relies entirely on client-side rendering with dynamic meta tags injected after Vue mounts to satisfy crawlers.
    • dIt renders each page on-demand via SSR and caches at the CDN edge to avoid build-time generation.
    Show the answer

    Answer: b · It generates static HTML at build time for SEO, then hydrates into a Vue 3 SPA for instant client-side navigation.

    VitePress produces static HTML at build time for search indexing and fast initial loads, then hydrates into a Vue SPA so subsequent navigation feels instant without full page reloads. Distractor D is tempting because the framework does pre-fetch chunks, but only for links visible in the viewport rather than the entire site at once.

    Read the full bite: VitePress 1.0 replaces VuePress for docs

15. Question 15 of 30

    When reviewing AI-generated Angular pull requests in mid-2026, what specific danger should senior engineers prioritize?

    • aAll generated RxJS operators must be immediately migrated to Signals to avoid breaking changes.
    • bIt may look correct while silently introducing outdated patterns and performance regressions.
    • cAI tools are generating code that explicitly disables zoneless change detection.
    • dThe code will fail to compile under Angular v21's new TypeScript strict mode.
    Show the answer

    Answer: b · It may look correct while silently introducing outdated patterns and performance regressions.

    The card warns that AI-generated code often looks correct but violates current best practices, causing silent architectural drift and performance regressions. It does not claim that legacy code fails to compile or that every RxJS operator must be migrated immediately.

    Read the full bite: Angular v21 ships while AI models write outdated code

16. Question 16 of 30

    A long-running agent job fails on step five after several expensive model calls. How does Vercel Workflow SDK handle the retry?

    • aIt resumes from the last successful checkpoint before the failure, avoiding redundant calls.
    • bIt pauses indefinitely until a developer manually approves the retry.
    • cIt restarts the entire job from step one and re-runs every previous model call.
    • dIt skips the failed step and proceeds to the next step.
    Show the answer

    Answer: a · It resumes from the last successful checkpoint before the failure, avoiding redundant calls.

    Workflow SDK checkpoints every step and persists state, so retries resume from the last good step instead of restarting from zero. Option C describes standard retry behavior without durable execution, while option B conflates automatic retries with the SDK's optional human-in-the-loop pauses.

    Read the full bite: Vercel ships AI Gateway, Workflow SDK, and Sandbox for agents

17. Question 17 of 30

    Why does the card say the tutorial uses active exercises rather than passive video?

    • aTo let learners fix errors in a browser without needing local TypeScript setup
    • bTo build debugging instincts and reduce reliance on guessing and type casting
    • cTo provide a searchable reference guide for error messages during code review
    • dTo cover both basic narrowing and module declaration edge cases in one sequence
    Show the answer

    Answer: b · To build debugging instincts and reduce reliance on guessing and type casting

    The card emphasizes that junior developers often guess and cast their way out of TypeScript errors, and active exercises are meant to build debugging instincts instead. Option A describes the Gitpod integration, which is a deployment convenience, not the pedagogical reason for choosing active exercises over video.

    Read the full bite: Matt Pocock Tutorial Covers Ten TypeScript Errors

18. Question 18 of 30

    Why does WasmGC benefit significantly from speculative inlining while traditional Wasm 1.0 modules generally do not?

    • aWasmGC binaries are larger and more complex, exceeding the optimization budgets of static compilers.
    • bLanguages targeting WasmGC compile through JavaScript, requiring V8 to optimize them with the same speculative pipeline used for JS.
    • cWasmGC features like virtual methods and subtyping produce indirect call targets that static analysis cannot predict, unlike statically structured Wasm 1.0.
    • dWasm 1.0 code lacks static type information, so it already relies on V8's speculative JIT rather than ahead-of-time toolchains.
    Show the answer

    Answer: c · WasmGC features like virtual methods and subtyping produce indirect call targets that static analysis cannot predict, unlike statically structured Wasm 1.0.

    WasmGC's higher-level constructs such as virtual methods and subtyping create opaque indirect call sites that defeat static analysis, making runtime feedback and speculative inlining essential. Option D reverses the actual relationship: Wasm 1.0 works well with ahead-of-time optimization precisely because it exposes sufficient static structure, not because it lacks it.

    Read the full bite: Chrome M137 Ships Speculative Deopts and Inlining for Wasm

19. Question 19 of 30

    How did PR #729's use of Cloudflare Sandboxes eliminate the heartbeat and shutdown-if-idle plumbing required by the earlier Container approach?

    • aBy delegating lifecycle pings to the queue worker that orchestrates the sandbox.
    • bBy running sandbox.exec() as a one-shot command that naturally terminates when the task finishes.
    • cBy relying on Cloudflare's built-in idle detection to automatically stop inactive sandboxes.
    • dBy packaging FFmpeg with a wrapper that signals completion back to a shutdown endpoint.
    Show the answer

    Answer: b · By running sandbox.exec() as a one-shot command that naturally terminates when the task finishes.

    PR #729 uses sandbox.exec() as a single command that exits when FFmpeg finishes, removing any need for long-lived service coordination. Option A is wrong because the worker does not send heartbeats for the sandbox; the one-shot model eliminates heartbeat logic entirely.

    Read the full bite: Cloudflare Sandboxes Cut Container Heartbeat Plumbing

20. Question 20 of 30

    Why is Angular v22's stabilization of Signal Forms, Angular Aria, and Asynchronous Reactivity APIs considered more significant than a routine version bump for large teams?

    • aIt provides production-ready primitives that reduce custom accessibility work and create clear migration targets away from legacy reactive forms
    • bIt automatically migrates legacy reactive forms and removes all experimental flags from Angular core
    • cIt guarantees that code written during the developer preview will require zero changes to work in v22 stable
    • dIt immediately deprecates template-driven forms and renders all existing RxJS-based form logic obsolete
    Show the answer

    Answer: a · It provides production-ready primitives that reduce custom accessibility work and create clear migration targets away from legacy reactive forms

    Stabilization means these APIs are now maintained long-term and safe to adopt, giving teams a clear path away from legacy reactive forms while reducing custom accessibility boilerplate. Distractor B is tempting because stable APIs imply safety, but the card emphasizes future maintenance and reduced risk, not that every preview API remained unchanged.

    Read the full bite: Angular v22 stabilizes Signal Forms, Aria, Asynchronous Reactivity APIs

21. Question 21 of 30

    How did SvelteKit 2.61 change the argument passed to an enhance callback?

    • aIt now receives raw FormData instead of any wrapped object
    • bIt now receives a destructured object with form, data, and a live() stream
    • cIt now receives an async iterable of server-sent submission events
    • dIt now receives a copy of the form remote function instance with a submit() API
    Show the answer

    Answer: d · It now receives a copy of the form remote function instance with a submit() API

    The card states that enhance callbacks now receive a copy of the form remote function instance exposing its own submit() API, replacing the old destructured object. Option B is tempting because it mixes the old callback shape with the new live() query feature, but live() is unrelated to enhance arguments.

    Read the full bite: SvelteKit 2.61 breaks remote functions, adds live queries

22. Question 22 of 30

    Mozilla's use of Claude Mythos Preview on Firefox demonstrated that modern LLMs can accomplish what traditional fuzzing alone struggled to achieve?

    • aAutomatically patch sandbox escapes in IPC boundaries without human review
    • bSimulate complex network edge cases to find memory leaks missed by fuzzers
    • cReplace human triage by filtering out all false positives before reporting
    • dIdentify deep architectural vulnerabilities hidden in heavily audited code for decades
    Show the answer

    Answer: d · Identify deep architectural vulnerabilities hidden in heavily audited code for decades

    Mozilla showed LLMs can uncover deep architectural bugs in heavily audited code that survived years of fuzzing. Option B describes just one specific technique from a single finding, not the broader capability, and D overstates the workflow since human triage remains essential.

    Read the full bite: Claude Mythos Cracks Firefox Bugs Fuzzing Missed

23. Question 23 of 30

    An Angular app suffers from both excessive backend requests during username checks and bloated bundles from legacy ngIf/ngFor usage. Which paired approach best resolves both issues?

    • aDebounce async validators in Signal Forms and migrate structural directives to Control Flow syntax
    • bReplace Signal Forms with RxJS reactive forms and wrap templates in @defer blocks
    • cUse synchronous validators only and convert all components to standalone
    • dAdd client-side HTTP caching and enable production build optimizations
    Show the answer

    Answer: a · Debounce async validators in Signal Forms and migrate structural directives to Control Flow syntax

    The correct paired approach is debouncing Signal Forms async validators to stop redundant backend calls and migrating legacy structural directives to Control Flow syntax for bundle and runtime gains. The most tempting distractor suggests using only synchronous validators and standalone components, but synchronous validators cannot check username availability against a backend, and standalone components do not replace legacy ngIf or ngFor directives.

    Read the full bite: Angular 21.1 ships with Signal Forms debounce patterns

24. Question 24 of 30

    What happens when an AI agent tries to launch a second next dev process in Next.js 16.2?

    • aThe new process automatically terminates the existing dev server and claims the port
    • bNext.js emits a structured error that includes the exact kill command for the running process
    • cThe agent is directed to consult the AGENTS.md file before proceeding
    • dBrowser errors are streamed to the terminal to warn the agent about the conflict
    Show the answer

    Answer: b · Next.js emits a structured error that includes the exact kill command for the running process

    The dev server lock file at .next/dev/lock stores the PID, port, and URL, enabling Next.js to return a structured error with the precise kill command rather than a generic port-in-use message. Option A is tempting because some dev tools auto-restart, but Next.js 16.2 explicitly returns an error instead, and Option D confuses the lock file feature with the separate browser-to-terminal logging feature.

    Read the full bite: Next.js 16.2 adds agent-native dev tooling

25. Question 25 of 30

    Why does the card suggest evaluating Vercel Connect against your current secret management strategy?

    • aBecause it replaces long-lived environment tokens with temporary scoped credentials
    • bBecause it enables service-to-service communication without public internet exposure
    • cBecause it integrates with Amazon Aurora and DynamoDB for credential storage
    • dBecause it provides sandboxed compute for agent code execution
    Show the answer

    Answer: a · Because it replaces long-lived environment tokens with temporary scoped credentials

    The card states that Vercel Connect introduces temporary scoped credentials for agent-to-service authentication, eliminating long-lived environment tokens, which directly addresses secret management and token rotation struggles. Option C confuses Connect with Marketplace database integrations, while B and D describe other distinct products in the Agent Stack.

    Read the full bite: Vercel Ship 2026: agent stack, eve framework, and microservices

26. Question 26 of 30

    Why did moving the apps into workspace packages under services/* initially break production?

    • aThe root package.json orchestration layer masked environment variables required by the OAuth worker at runtime
    • bNx build caching invalidated Docker layer caches and caused container startup failures
    • cNode enforced package boundaries, exposing invalid import aliases and hardcoded paths that assumed the old root-relative layout
    • dConsolidating three lockfiles into one root package-lock.json introduced conflicting transitive dependency versions
    Show the answer

    Answer: c · Node enforced package boundaries, exposing invalid import aliases and hardcoded paths that assumed the old root-relative layout

    Node began enforcing package boundaries after the move, so an import alias that reached outside the services/site boundary failed with ERR_INVALID_PACKAGE_TARGET and a hardcoded MDX fetch path pointed to the wrong location. Option D is tempting because lockfile consolidation produced most of the diff, but the outage was caused by path assumptions, not dependency conflicts.

    Read the full bite: Kent C. Dodds Fixes Accidental Monorepo with Workspaces

27. Question 27 of 30

    When using Vue 3.5's stable reactive props destructure, what must you do to keep a destructured prop reactive when passing it to watch or a composable?

    • aConvert it to a ref using toRef()
    • bUse withDefaults as a fallback wrapper
    • cPass it directly; destructured props retain reactivity automatically
    • dWrap the variable in a getter function
    Show the answer

    Answer: d · Wrap the variable in a getter function

    Vue 3.5 requires wrapping destructured props in getters when passing them to watch or composables to preserve reactivity. Passing them directly severs the reactive link, and withDefaults is the old boilerplate this feature replaces.

    Read the full bite: Vue 3.5 cuts reactivity memory 56%, adds lazy hydration

28. Question 28 of 30

    When upgrading to SvelteKit 2.56, which behavior change affects existing client-side query refresh logic?

    • aClient-side refreshes are now automatically sorted by object keys to stabilize caching
    • bQuery refreshes now require explicit server permission before executing
    • cQueries must now be awaited exclusively within the new run() method
    • dQuery refreshes now return a boolean indicating submission validity instead of data
    Show the answer

    Answer: b · Query refreshes now require explicit server permission before executing

    The card states that client-requested query refreshes now require explicit server permission rather than executing automatically. Option D is tempting because a boolean return was indeed added, but that change applies to form submissions, not query refreshes.

    Read the full bite: SvelteKit 2.56 overhauls remote functions, adds TypeScript 6.0

29. Question 29 of 30

    The explainer opens by stressing that RSC is not SSR. Based on the card, why do client components need their props to be serializable?

    • aBecause data has to cross the network boundary from server to client components
    • bBecause all components in RSC apps are rendered exclusively in the browser
    • cBecause SSR requires hydration but RSC does not render on the server at all
    • dBecause TypeScript enforces serialization for all React props by default
    Show the answer

    Answer: a · Because data has to cross the network boundary from server to client components

    The card ties prop serialization to where the network boundary sits between server rendered and client components. The tempting wrong answer assumes RSC renders everything in the browser, which contradicts the entire premise that components render on the server.

    Read the full bite: Server Components, explained without the jargon

30. Question 30 of 30

    Which category covers 'React interview cheatsheet: hooks rules in 60 seconds' most accurately?

    • aSports trivia
    • bCybersecurity
    • cReact & Next.js
    • dDev Tools
    Show the answer

    Answer: c · React & Next.js

    This bite is filed under React & Next.js.

    Read the full bite: React interview cheatsheet: hooks rules in 60 seconds