bQuery.js - The jQuery for the modern Web Platform.

Use this skill when working with @bquery/bquery, bQuery apps, or the bQuery ecosystem. It helps the agent choose the right bQuery module, write idiomatic code, and use the library across core DOM APIs, reactivity, concurrency workers, Web Components, motion, security, platform helpers, router, store, declarative views, forms, i18n, accessibility, drag-and-drop, media observers, plugins, devtools, testing, Storybook, and SSR.

bQuery Skill

Use this skill whenever a task involves @bquery/bquery.

bQuery is a modular, TypeScript-first, zero-build-capable browser library that combines jQuery-style DOM ergonomics with signals, async workflows, Web Components, motion, routing, stores, declarative views, forms, accessibility helpers, media observers, plugins, devtools, testing, and SSR.

Current documented baseline to keep in mind:

• watchDebounce() and watchThrottle() are public reactive APIs
• bq-error and bq-aria are part of the view surface
• useIntersectionObserver(), useResizeObserver(), and useMutationObserver() are public media composables
• the concurrency module includes worker helpers, RPC helpers, pools, reactive worker wrappers, and higher-level helpers like parallel(), batchTasks(), map(), filter(), reduce(), and pipeline()

When to use this skill

Activate this skill when any of the following are true:

• package.json includes @bquery/bquery
• imports use @bquery/bquery or subpaths like:
  • @bquery/bquery/core
  • @bquery/bquery/reactive
  • @bquery/bquery/component
  • @bquery/bquery/view
• the user mentions:
  • bQuery
  • bq-* directives
  • signals
  • Web Components
  • zero-build browser apps
  • bQuery router/store/forms/motion/testing/SSR
• the repository already uses bQuery conventions

Primary rules

1. Prefer TypeScript unless the repository is clearly plain JavaScript.
2. Prefer subpath imports over the root bundle.
3. Use the smallest bQuery module that solves the task.
4. Prefer browser-native patterns over framework-specific abstractions.
5. Add cleanup for effects, watchers, observers, sockets, workers, and listeners where relevant.
6. Sanitize untrusted HTML before rendering it.
7. If using the view module, mention CSP implications: the view evaluator uses new Function() and requires unsafe-eval.
8. Be accessibility-aware by default.
9. Respect reduced motion for non-trivial animation.
10. Do not add React/Vue/Svelte unless the user explicitly asks.

Import strategy

Prefer targeted imports:

ts

import { $, $$ } from '@bquery/bquery/core';
import {
  signal,
  computed,
  effect,
  watch,
  watchDebounce,
  watchThrottle,
} from '@bquery/bquery/reactive';
import { component, html } from '@bquery/bquery/component';

Use the root entry only for broad demos:

ts

import {
  $,
  signal,
  component,
  registerDefaultComponents,
} from '@bquery/bquery';

Module chooser

Need	Use
DOM selection, traversal, classes, attrs, events	@bquery/bquery/core
Signals, computed values, effects, async data, HTTP, sockets	@bquery/bquery/reactive
Worker tasks, RPC workers, pools, pipelines	@bquery/bquery/concurrency
Web Components	@bquery/bquery/component
Storybook helpers	@bquery/bquery/storybook
Animation and transitions	@bquery/bquery/motion
Sanitization, Trusted Types, CSP helpers	@bquery/bquery/security
Storage, cookies, page meta, announcers	@bquery/bquery/platform
SPA routing	@bquery/bquery/router
App-level state	@bquery/bquery/store
Declarative DOM with bq-* directives	@bquery/bquery/view
Form state and validation	@bquery/bquery/forms
Internationalization	@bquery/bquery/i18n
Focus and keyboard UX	@bquery/bquery/a11y
Drag and drop	@bquery/bquery/dnd
Viewport, clipboard, observers, device/browser signals	@bquery/bquery/media
Plugins/custom directives	@bquery/bquery/plugin
Debugging helpers	@bquery/bquery/devtools
Test helpers	@bquery/bquery/testing
Server rendering and hydration	@bquery/bquery/ssr

Module guidance

Core

Use core for direct DOM work:

• $(), $$()
• traversal and manipulation
• event binding and delegation
• css() getter/setter
• is(selector)
• find(selector)
• utilities like debounce(), throttle(), uid, merge, once

Prefer this for:

• progressive enhancement
• small widgets
• DOM-heavy tasks without a component or view layer

Reactive

Use reactive for state and async workflows:

• signal(), computed(), effect(), batch()
• watch(), watchDebounce(), watchThrottle()
• linkedSignal(), persistedSignal(), readonly()
• useAsyncData(), useFetch(), createUseFetch()
• createHttp(), http
• usePolling()
• usePaginatedFetch(), useInfiniteFetch()
• useWebSocket(), useWebSocketChannel()
• useEventSource()
• useResource(), useResourceList()
• useSubmit()
• createRestClient()
• createRequestQueue()
• deduplicateRequest()

Important reminder: watchDebounce() and watchThrottle() should be treated like watch() with the same cleanup-safe callback style.

Concurrency

Use concurrency for CPU-heavy work or isolated execution:

• runTask()
• createTaskWorker(), createTaskPool()
• createRpcWorker(), createRpcPool()
• createReactiveTaskWorker(), createReactiveTaskPool()
• createReactiveRpcWorker(), createReactiveRpcPool()
• callWorkerMethod()
• batchTasks()
• parallel(), pipeline()
• map(), filter(), reduce(), find(), every(), some()
• getConcurrencySupport()

Prefer this for:

• parsing
• indexing
• transforms
• large collections
• worker-monitored UI workloads

Do not use worker orchestration for tiny UI-only tasks.

Component

Use component for reusable Web Components:

• component(tag, def)
• defineComponent(tag, def)
• html
• safeHtml
• bool()
• registerDefaultComponents()

Prefer this for:

• design-system primitives
• reusable widgets
• shadow DOM components
• framework-agnostic distribution

Motion

Use motion for browser-native animation:

• animate()
• transition()
• flip(), flipElements(), flipList()
• spring()
• timeline(), sequence()
• stagger()
• scrollAnimate()
• prefersReducedMotion()

Always account for reduced motion.

Security

Use security whenever HTML is dynamic:

• sanitize(), sanitizeHtml()
• trusted()
• escapeHtml()
• stripTags()
• nonce/CSP helpers
• Trusted Types helpers

Hard rule: never inject untrusted HTML without sanitizing it first.

Router

Use router for SPA navigation:

• createRouter()
• navigate()
• back(), forward()
• currentRoute
• link()
• interceptLinks()
• resolve()

Store

Use store for app-level state:

• createStore()
• defineStore()
• createPersistedStore()
• mapState, mapGetters, mapActions
• watchStore()

Store patterns commonly include:

• $state
• $reset
• $patch
• $patchDeep
• $subscribe
• $onAction

View

Use view for declarative HTML binding:

• mount()
• createTemplate()
• clearExpressionCache()

Current directive surface to remember includes:

• bq-text
• bq-html
• bq-if
• bq-for
• bq-model
• bq-class
• bq-style
• bq-show
• bq-bind
• bq-on:event
• bq-error
• bq-aria

Important: the view module uses new Function() internally. Mention that strict CSP setups need unsafe-eval.

Forms, i18n, a11y, dnd, media

Use:

• createForm() and validators from forms
• createI18n() from i18n
• trapFocus(), releaseFocus(), rovingTabIndex() from a11y
• draggable(), droppable(), sortable() from dnd
• mediaQuery(), useViewport(), clipboard
• useIntersectionObserver(), useResizeObserver(), useMutationObserver() from media

Canonical patterns

1. DOM enhancement

ts

import { $, $$ } from '@bquery/bquery/core';

$('#save').on('click', () => {
  console.log('Saved');
});

$('#list').delegate('click', '.item', (_event, target) => {
  $(target).toggleClass('active');
});

$('#box').addClass('ready').css({ opacity: '0.85' });

if ($('#box').is('.ready')) {
  console.log($('#box').css('opacity'));
}

$$('.container').find('.item').addClass('found');

2. Signals and debounced search

ts

import {
  computed,
  effect,
  signal,
  useFetch,
  watchDebounce,
} from '@bquery/bquery/reactive';

const query = signal('');
const page = signal(1);

const normalizedQuery = computed(() => query.value.trim());

const results = useFetch<{ items: string[]; total: number }>(
  () =>
    `/search?q=${encodeURIComponent(normalizedQuery.value)}&page=${
      page.value
    }`,
  {
    baseUrl: 'https://api.example.com',
    watch: [query, page],
  }
);

watchDebounce(
  query,
  () => {
    page.value = 1;
  },
  250
);

effect(() => {
  console.log(results.pending.value);
  console.log(results.data.value);
  console.log(results.error.value);
});

3. Worker offloading

ts

import {
  createReactiveTaskPool,
  parallel,
} from '@bquery/bquery/concurrency';

const pool = createReactiveTaskPool(
  ({ value }: { value: number }) => value * 2,
  { size: 4 }
);

const output = await parallel(
  [1, 2, 3, 4].map((value) => () => pool.run({ value }))
);

console.log(output);
console.log(pool.pending$.value);

4. Web Component with safe HTML

ts

import {
  bool,
  component,
  safeHtml,
} from '@bquery/bquery/component';
import { sanitizeHtml, trusted } from '@bquery/bquery/security';

const badge = trusted(sanitizeHtml('<span class="badge">Active</span>'));

component('user-card', {
  props: {
    username: { type: String, required: true },
  },
  state: {
    disabled: false,
  },
  render({ props, state }) {
    return safeHtml`
      <button class="user-card" ${bool('disabled', state.disabled)}>
        ${badge}
        <span>Hello ${props.username}</span>
      </button>
    `;
  },
});

5. Declarative view with bq-error and bq-aria

html

<section id="profile-form">
  <input
    id="email"
    bq-model="email"
    bq-aria="{ invalid: fieldState.value.invalid, 'aria-describedby': fieldState.value.describedBy }"
    type="email"
  />
  <p id="email-error" bq-error="formError"></p>
  <button bq-on:click="submit">Save</button>
</section>

ts

import { mount } from '@bquery/bquery/view';
import { signal } from '@bquery/bquery/reactive';

const email = signal('');
const formError = signal('');
const fieldState = signal({
  invalid: false,
  describedBy: '',
});

mount('#profile-form', {
  email,
  formError,
  fieldState,
  submit: () => {
    const value = email.value.trim();
    const invalid = !value.includes('@');

    formError.value = invalid ? 'Please enter a valid email address.' : '';
    fieldState.value = {
      invalid,
      describedBy: invalid ? 'email-error' : '',
    };
  },
});

Note: if this is used in a strict CSP environment, mention that @bquery/bquery/view needs unsafe-eval.

Response policy

When answering bQuery questions:

• explain which bQuery module you chose and why
• keep imports minimal
• prefer subpath imports
• preserve zero-build/browser-native patterns where appropriate
• mention cleanup for observers, workers, sockets, and effects
• mention accessibility for interactive UI
• mention reduced motion for animations
• mention sanitization for dynamic HTML
• mention CSP implications when using the view module
• consider concurrency for CPU-heavy work, not trivial work

Anti-patterns to avoid

Do not:

• import the full root bundle by default
• inject untrusted HTML directly
• use bq-html with unsafe user content
• forget cleanup for long-lived reactive resources
• ignore keyboard and screen-reader behavior
• use workers where normal reactive code is enough
• add another framework to solve problems bQuery already solves
• omit CSP guidance when using @bquery/bquery/view

Good defaults

If the task is vague, prefer:

• core for small DOM tasks
• reactive for stateful UI
• component for reusable widgets
• view for declarative plain-HTML binding
• forms for structured validation
• router + store for SPA structure
• security for any dynamic HTML
• media for observer-driven behavior
• concurrency only when heavy work justifies it

One-line summary

Use bQuery as a modular, browser-native toolkit: choose the smallest module, prefer subpath imports, use signals and Web Components idiomatically, sanitize dynamic HTML, document CSP constraints for the view layer, and include accessibility, cleanup, and reduced-motion behavior by default.