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javascript-docs

Enseña las prácticas actuales de JavaScript (ECMAScript) basadas en la documentación MDN. Útil al escribir, revisar o corregir JavaScript moderno, elegir una API integrada o reemplazar un patrón obsoleto.

¿Qué es javascript-docs?

Este skill proporciona una guía completa y actualizada de JavaScript (ECMAScript) basada en la documentación MDN (Mozilla Developer Network). Está diseñado para ayudar a desarrolladores a escribir, revisar y corregir código JavaScript moderno, cubriendo desde características fundamentales hasta las API más recientes y patrones recomendados. Incluye reglas de alto valor para evitar errores comunes, como el uso correcto de operadores (`??`, `?.`), manejo de promesas y async/await, gestión de recursos con `using`, y nuevas funcionalidades de ES2024+. El skill organiza su contenido en archivos de referencia temáticos (por ejemplo: asincronía, clases, objetos, colecciones, expresiones regulares, fechas con Temporal, internacionalización, módulos), cada uno con enlaces directos a las páginas de MDN. Es útil tanto para quienes aprenden JavaScript como para desarrolladores experimentados que necesitan recordar detalles específicos o reemplazar patrones obsoletos. Está optimizado para su uso en entornos como Claude Code, Cursor o Codex.

Compatible con~Claude Code~Codex CLI~Cursor
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Documentación

JavaScript (MDN)

Este skill condensa la Guía y Referencia de JavaScript de MDN en lo que difiere de la costumbre: trampas, valores predeterminados sorprendentes, API obsoletas con sus reemplazos y los patrones que MDN recomienda. Cada afirmación en los archivos de referencia termina con la página de MDN de la que proviene. Se omiten los conceptos básicos que todo desarrollador de JavaScript conoce.

Versión cubierta

MDN sigue el estándar ECMAScript vivo y no tiene una ruta versionada. También documenta características de TC39 etapa 3, antes de que sean definitivas, por lo que los ejemplos pueden usar características que aún no están disponibles en todos lados. https://developer.mozilla.org/es/docs/Web/JavaScript

Las características recientes pueden tener disponibilidad limitada. Antes de depender de una (Temporal, ayudantes de iteradores, using, Promise.try, RegExp.escape, Error.isError, Math.sumPrecise, Uint8Array.fromBase64, métodos de Set, Map.prototype.getOrInsert), verifique el tiempo de ejecución objetivo. Los elementos que MDN marca como experimentales se etiquetan como tales en las referencias.

Cómo navegar

  1. Lea las reglas de mayor valor a continuación. Capturan los errores más frecuentes.
  2. Abra el archivo de referencia que coincida con la tarea, de la tabla al final. Cada archivo es independiente. Una tarea con zonas horarias, horario de verano (DST) o duraciones necesita ambos archivos de Temporal. Una tarea con limpieza o using necesita el archivo de iteradores y gestión de recursos.
  3. Al tocar código antiguo, lea la tabla "Patrones antiguos" al final del archivo correspondiente.

Reglas de mayor valor

Archivos de referencia

ArchivoLéalo para
references/language-core-and-equality.md== versus ===, coerción, typeof, let/const/var y la zona muerta, modo estricto, ASI, octales, modelo de ejecución, sintaxis obsoleta
references/functions-and-classes.mdfunciones flecha y this, parámetros por defecto y rest, accesores, bind, campos de clase, #private, bloques estáticos, extends, super
references/objects-prototypes-and-proxy.mdObject.hasOwn, assign, defineProperty, freeze, groupBy, prototipos, objetos de prototipo nulo, Proxy, Reflect, Symbol, globalThis, eval
references/statements-and-operators.md??, ?., asignación lógica, spread, desestructuración, delete, trampas aritméticas y de bits, operadores BigInt, comparación, bucles, switch, etiquetas, try/finally
references/async-and-promises.mdcadenas de promesas, combinadores, Promise.try, withResolvers, allKeyed, orden de async/await, rechazos no manejados, fugas de memoria de promesas
references/iterators-and-resource-management.mdprotocolos de iteración, ayudantes de iterador, Iterator.zip/concat, generadores, using, await using, DisposableStack, SuppressedError, WeakRef, FinalizationRegistry
references/arrays-and-collections.mdmétodos de copia de arrays, at, includes, findLast, sort, reduce, arrays dispersos, Array.from, Map, métodos de Set, getOrInsert, WeakMap, WeakSet
references/strings.mdUTF-16, puntos de código y grafemas, localeCompare, normalize, patrones de replace, replaceAll, matchAll, split, String.raw, codificación URI
references/regexp.mdRegExp.escape, elección de método, lastIndex, indicadores y y d, modos u y v, \p{...}, modificadores, anclas, grupos, referencias inversas, lookbehind
references/numbers-math-json.mdprecisión de punto flotante, parseInt, redondeo, toFixed, BigInt, Math.random, Math.sumPrecise, reglas de JSON.stringify, revivers, JSON.rawJSON
references/binary-data-and-shared-memory.mdarrays tipados, endianness de DataView, ArrayBuffer redimensionable y transferido, base64 y hex en Uint8Array, SharedArrayBuffer, Atomics
references/date-and-temporal.mdmigración de Date a Temporal, elección de un tipo Temporal, reglas compartidas de Temporal, fechas y horas simples, mantenimiento de código Date
references/temporal-time-zones-and-durations.mdZonedDateTime, zonas IANA, desambiguación de horario de verano y offset, since/until, balanceo y redondeo de Duration, Temporal.Now
references/intl.mdelección de configuración regional y respaldo, DateTimeFormat, opciones de dígitos de NumberFormat, Collator, Segmenter, PluralRules, RelativeTimeFormat, ListFormat, DurationFormat
references/errors-and-debugging.mdcause, subclases de Error, Error.isError, AggregateError, seguimientos de pila, mensajes de error de tiempo de ejecución comunes y sus soluciones
references/modules.mdmódulo versus script, enlaces en vivo, ciclos, import(), import.meta, atributos de importación, import defer, import source, mapas de importación

Las páginas rastreadas, la nota de versión y la fecha de obtención se enumeran en SOURCES.md.

Individual skills in this repo

This repo contains 16 individual skills — each has its own dedicated page.

eslint-docs

Teaches current ESLint 10 practices drawn from the official documentation. Use when writing, reviewing or fixing an eslint.config.js (flat config, defineConfig, files, ignores, globalIgnores, extends, languageOptions, globals, parsers, processors), configuring ESLint rules and severities, disable comments and inline config, running the CLI in CI (--fix, --cache, --quiet, --max-warnings, bulk suppressions, formatters, feature flags, MCP server), writing custom rules (meta, schema, fixes, suggestions, selectors, scope, code paths) and testing them with RuleTester, building plugins, shareable configs, custom parsers, processors or formatters, using the Node.js API (ESLint, Linter), or migrating to ESLint 9 or 10 from eslintrc. Triggers on eslint, eslint.config.js, flat config, .eslintrc, .eslintignore, @eslint/js, js/recommended, eslint-disable, no-unused-vars, no-restricted-imports, no-restricted-syntax, RuleTester, eslint-plugin, eslint-config, FlatCompat, context.getScope is not a function, ESLint 10.

grafana-cloud-docs

Grafana Cloud pitfalls, defaults, limits and current patterns from the Grafana, Mimir, Loki and Tempo docs, each tied to its docs URL. Use when sending OpenTelemetry data to Grafana Cloud, writing PromQL, LogQL or TraceQL, controlling cardinality and cost, designing alert rules, routing notifications, provisioning alerting, building Synthetic Monitoring checks, using the /apis dashboard API, choosing access policy tokens or service accounts, or migrating off API keys, the Loki Exporter and legacy /api routes.

next-intl-docs

Teaches current next-intl 4 practices for internationalizing Next.js apps, drawn from the official documentation. Use when setting up next-intl with the App Router, writing i18n/request.ts, adding a [locale] segment with defineRouting, createMiddleware in proxy.ts (formerly middleware.ts), building locale switchers with createNavigation, translating with useTranslations or getTranslations, passing messages to NextIntlClientProvider, writing ICU messages (plurals, select, rich text), formatting dates, numbers and lists with useFormatter, translating metadata, Server Actions, Route Handlers, localized 404 and error pages, static rendering with next/root-params, type-safe messages through AppConfig, testing with Jest, Vitest, Storybook, or extracting inline messages with useExtracted. Triggers on next-intl, useTranslations, getTranslations, NextIntlClientProvider, getRequestConfig, i18n routing, locale prefix, localePrefix, NEXT_LOCALE, hreflang, setRequestLocale, ICU messages, App Router internationalization.

nodejs-docs

Teaches Node.js practice drawn from the official Node.js API documentation, with pitfalls, surprising defaults, deprecations and replacements, each backed by its nodejs.org URL. Use when writing, reviewing, debugging or upgrading Node.js code, or choosing a built-in module (fs, crypto, streams, http, process, CLI flags, node:test, ESM/CommonJS, package.json exports, TypeScript type stripping, child_process, worker_threads, node:sqlite, deprecations).

playwright-docs

Pitfalls, surprising defaults and recommended patterns of Playwright Test for JavaScript and TypeScript, distilled from the official docs. Use when writing, reviewing, debugging or configuring Playwright tests (@playwright/test, playwright.config.ts, npx playwright test), including flaky tests, locators (getByRole, filter, strict mode), web-first assertions (expect, toHaveText, toBeVisible, expect.poll, toPass), fixtures, storageState authentication, project dependencies, timeouts, retries, network mocking (page.route, routeFromHAR, routeWebSocket), API testing, clock, aria snapshots, toHaveScreenshot, axe accessibility scans, traces, UI mode, reporters, CI, Docker, sharding, test locks, component testing with stories and mount, codegen, Playwright MCP, playwright-cli and migration from Puppeteer, Protractor, Testing Library or older Playwright versions.

postgresql-docs

Pitfalls, surprising defaults, PostgreSQL 18 changes and recommended patterns from the official PostgreSQL 18 documentation, each backed by its postgresql.org URL. Use when writing or reviewing PostgreSQL SQL, schema design, migrations and ALTER TABLE locks, indexes, transactions, isolation levels and retries, locking, upsert and MERGE, COPY, JSONB, timestamptz, generated and identity columns, partitioning, EXPLAIN, vacuum, roles, row-level security, PL/pgSQL, full-text search, connection settings, and upgrades to PostgreSQL 18.

react-docs

Writes, reviews and upgrades React 19.3 code from the official react.dev documentation. Use when writing components and Hooks, removing unnecessary useEffect calls, fixing Effect dependencies with useEffectEvent, building forms with Actions (useActionState, useOptimistic, useFormStatus, form action), using Server Components, 'use client', 'use server' and Server Functions, Suspense, use(), useTransition, useDeferredValue, ViewTransition, Activity, adopting React Compiler and eslint-plugin-react-hooks, deciding on useMemo, useCallback and memo, server rendering and hydration (createRoot, hydrateRoot, renderToPipeableStream, prerender), or migrating from React 18 (forwardRef, Context.Provider, ReactDOM.render, propTypes, defaultProps). Triggers on React, JSX, hooks, useState, useEffect, useRef, useContext, Server Components, RSC, Actions, React Compiler, Strict Mode, hydration mismatch, React 19 upgrade.

rust-std-docs

Gives current guidance from the official Rust standard library docs (std 1.99.1 stable) on pitfalls, panics, platform differences, discouraged APIs and newer stable replacements. Use when writing, reviewing or refactoring Rust code that uses std, especially collections (Vec, HashMap, BTreeMap, BinaryHeap, entry, extract_if, sort), Option/Result/error handling (expect, ?, Error, ExitCode, panic), iterators (collect, flatten, Peekable, try_fold), Box/Rc/RefCell/Cow/Pin/mem::take, Arc/Mutex/RwLock/OnceLock/LazyLock/thread::scope/mpsc/Condvar/atomics, String/str/fmt/format!/OsString/CString, io/fs/path (BufWriter, OpenOptions, PathBuf::join), process/env/net/time (Command, set_var, TcpStream, Instant, Duration), From/TryFrom/AsRef/Ord/Drop/Deref/Clone, and unsafe raw pointers, MaybeUninit, transmute, NonNull or integer overflow and float ordering.

socketio-docs

Builds, configures and debugs Socket.IO 4.8 servers and clients from the official Socket.IO v4 documentation. Use when writing a Node.js Socket.IO server (Express, Fastify, Koa, Bun, uWebSockets.js) or a socket.io-client app, emitting events with acknowledgements, timeout() and emitWithAck, broadcasting to rooms and namespaces, authenticating in middleware with the auth option, configuring CORS, reverse proxies and sticky sessions, scaling with the Redis, Redis Streams, Postgres, MongoDB or Cluster adapter, enabling connection state recovery and delivery guarantees, tuning reconnection, writing tests, troubleshooting connection issues, or migrating from Socket.IO v2 or v3. Triggers on Socket.IO, socket.io, socket.io-client, io(), new Server, emit, emitWithAck, acknowledgements, rooms, namespaces, broadcast, io.use, middleware, CORS, Redis adapter, sticky sessions, connection state recovery, reconnection, connect_error, Session ID unknown. Not for plain WebSocket servers such as ws without Socket.IO.

tailwindcss-docs

Teaches current Tailwind CSS v4 practices drawn from the official documentation. Use for any task that touches Tailwind CSS v4, even a small one, because many v3 habits silently break in v4. Use when writing or reviewing Tailwind CSS v4 code (utility classes, variants, arbitrary values, theme variables in @theme, @utility, @custom-variant, @apply, @reference, @source), setting up Tailwind in a framework or build tool (Vite plugin, PostCSS plugin, CLI, Next.js, SvelteKit, Nuxt, Angular, Laravel, Rails), customizing the theme (colors, fonts, breakpoints, spacing, animations), building dark mode with a class or data attribute, or migrating a project from Tailwind v3 (tailwind.config.js, @tailwind directives, darkMode class, safelist, bg-opacity, renamed shadow and outline utilities). Triggers on tailwindcss, @import "tailwindcss", @tailwindcss/vite, @tailwindcss/postcss, @tailwindcss/cli, @theme, @custom-variant dark, npx @tailwindcss/upgrade, upgrade to Tailwind v4.

tauri-docs

Tauri 2 apps, tauri.conf.json, capabilities and permissions, commands and invoke, events and channels, plugins, bundling, signing and the updater, migration from Tauri 1. Guides Tauri 2 work from the official v2 documentation, including scopes, managed state, plugin authoring, CSP and the isolation pattern, testing and debugging, Linux, Windows and macOS packages, and mobile and store releases. Use when writing or reviewing a Tauri 2 app, adding a plugin or a capability, fixing a "not allowed" or "forbidden path" error, wiring IPC between Rust and the webview, packaging, signing or publishing a desktop or mobile build, or upgrading a Tauri 1 or 2.0 beta project.

tokio-docs

Gives current guidance from the official tokio documentation (tokio 1.54.1) on async Rust pitfalls, cancel safety, blocking code, surprising defaults and deprecated APIs. Use when writing, reviewing or debugging async Rust code that uses tokio, especially the runtime (#[tokio::main], #[tokio::test], Builder, enable_all, block_on, current_thread, LocalRuntime, shutdown, feature flags), tasks (spawn, JoinHandle, JoinSet, abort, spawn_blocking, block_in_place, LocalSet, spawn_local, task_local), select!, join!, try_join!, cancellation and graceful shutdown, sync primitives (Mutex across .await, RwLock, Semaphore, Notify, OnceCell), channels (mpsc backpressure, oneshot, broadcast lag, watch), time (sleep, interval, MissedTickBehavior, timeout, paused time, start_paused), I/O and networking (AsyncReadExt, BufWriter flush, split, io::copy, framing, TcpListener, TcpStream, UdpSocket), tokio::fs, process (Command, kill_on_drop, Child), signals (ctrl_c, Windows console events) and Windows named pipes.

typescript-docs

Configures, writes and upgrades TypeScript 6.0 code and tsconfig.json from the official TypeScript documentation. Use when upgrading from TypeScript 5.x to 6.0 (strict, types, rootDir, baseUrl, moduleResolution node, target es5, outFile, esModuleInterop), choosing module and moduleResolution, writing package.json exports and imports, fixing ESM and CommonJS interop, enabling verbatimModuleSyntax or erasableSyntaxOnly, setting up project references and tsc --build, writing .d.ts files, checking JavaScript with JSDoc, or debugging narrowing, generics, mapped types, decorators and enums. Triggers on TypeScript, tsc, tsconfig, TS5112, ignoreDeprecations, nodenext, bundler, .d.ts, @ts-check, TypeScript 6 upgrade.

typesense-docs

Pitfalls, surprising defaults and recommended patterns of the Typesense search engine, distilled from the official docs. Use when designing a Typesense collection schema, writing search parameters (q, query_by, filter_by, sort_by, facet_by, group_by), tuning typo tolerance and ranking, building vector, semantic or hybrid search, conversational RAG or natural language search, creating API keys and scoped search keys for multi-tenancy, indexing and import (JSONL, upsert, emplace, dirty_values), syncing from a primary database, reindexing through aliases, managing synonyms (synonym sets), curation sets and stopwords, joins, analytics rules and query suggestions, InstantSearch, migrating from Algolia, or running, clustering, backing up and upgrading a Typesense server.

vite-docs

Teaches current Vite 8 practices drawn from the official documentation. Use when writing or fixing a vite.config, migrating from Vite 7 (Rolldown and Oxc replacing Rollup and esbuild), configuring the dev server, proxy or HMR, handling import.meta.env and modes, tuning the production build, library mode, SSR, writing a Vite plugin, using the HMR or JavaScript API, or the Environment API. Triggers on vite.config, defineConfig, rolldownOptions, import.meta.env, loadEnv, optimizeDeps, ssrLoadModule, ModuleRunner, this.environment, upgrade to Vite 8.

vitest-docs

Teaches current Vitest 5 practices drawn from the official documentation. Use when writing, reviewing or fixing Vitest tests (test, describe, expect, test.for, fixtures with test.extend, hooks, snapshots), mocking with vi (vi.fn, vi.spyOn, vi.mock, vi.when, fake timers, stubGlobal, stubEnv), configuring vitest.config or projects, choosing an environment or pool, filtering and running tests in CI, measuring coverage with v8 or istanbul, debugging slow or flaky suites, testing components in browser mode with Playwright, or migrating from Jest, Mocha or Vitest 4. Triggers on vitest, vi.mock, vi.fn, vitest.config, toMatchSnapshot, expect.poll, coverage thresholds, browser mode, @vitest/browser-playwright, jsdom, happy-dom, migrate Jest to Vitest, upgrade Vitest 5.

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