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core-js✓ Pass

Work on the framework's own JavaScript in `core/js/` — the `tabler.js` and `tabler-theme.js` bundles, the vendored Bootstrap component port, and their browser tests. Use when a Tabler behaviour needs adding or fixing (a `data-bs-toggle` handler, the theme switcher, a plugin initialiser), when a Bootstrap component's JS misbehaves, and before changing anything under `core/js/src/`. Not for demo-page scripts — that is the `astro-scripts` skill.

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// Install Skill

Install Skill

Skills are third-party code from public GitHub repositories. SkillHub scans for known malicious patterns but cannot guarantee safety. Review the source code before installing.

Install globally (user-level):

npx skillhub install tabler/tabler/core-js

Install in current project:

npx skillhub install tabler/tabler/core-js --project

skill.install.customTargetHelp

npx skillhub install tabler/tabler/core-js --target-dir /path/to/skills

Suggested path: ~/.claude/skills/core-js/

SKILL.md Content

---
name: core-js
description: >-
  Work on the framework's own JavaScript in `core/js/` — the `tabler.js` and
  `tabler-theme.js` bundles, the vendored Bootstrap component port, and their
  browser tests. Use when a Tabler behaviour needs adding or fixing (a
  `data-bs-toggle` handler, the theme switcher, a plugin initialiser), when a
  Bootstrap component's JS misbehaves, and before changing anything under
  `core/js/src/`. Not for demo-page scripts — that is the `astro-scripts`
  skill.
---

# The framework JavaScript

`core/js` builds two shipped bundles. Everything here is public API and is bound by a size budget.

## 1. Two entry points

| Entry | Ships as | Holds |
| --- | --- | --- |
| `js/tabler.ts` | `tabler.js` / `.esm.js` (+ `.min`) | plugin initialisers, the Bootstrap components, the `tabler` helper namespace |
| `js/tabler-theme.ts` | `tabler-theme.js` (+ variants) | the colour-mode/theme switcher only |

`tabler-theme.js` is loaded right after `<body>` and **not deferred**, so the chosen theme applies before the first paint. It stays tiny on purpose (bundlewatch: 1 kB raw, 800 B minified) — do not add anything to it that is not needed before paint.

## 2. `js/src/bootstrap/**` is a port, not our code

That directory is Bootstrap's JavaScript rewritten in TypeScript, MIT headers kept, `VERSION = '5.3.8'`. Treat it as vendored:

- Fix bugs the way upstream did, and keep the file's structure recognisable against `twbs/bootstrap`. Gratuitous restructuring makes the next upstream sync expensive.
- `js/src/bootstrap.ts` is the single source of truth for what is exported and for the `bootstrap` namespace object.
- Coverage is configured to measure exactly this directory (`js/src/bootstrap/**`), and `js/tests/unit/*.spec.ts` mirrors upstream's suite — a change here is expected to come with its test.

## 3. Tabler's own modules

Modules directly in `js/src/*.ts` (`autosize`, `countup`, `dropdown`, `input-mask`, `popover`, `sortable`, `switch-icon`, `tab`, `toast`, `tooltip`) are **side-effect initialisers**: importing them from `tabler.ts` wires the behaviour. The pattern is a `data-bs-toggle` query at import time:

```ts
// js-docs-start switch-icon-init
const switchesTriggerList: HTMLElement[] = [].slice.call(document.querySelectorAll<HTMLElement>('[data-bs-toggle="switch-icon"]'))
switchesTriggerList.map(function (switchTriggerEl: HTMLElement) {
  switchTriggerEl.addEventListener('click', (e: MouseEvent) => {
    const active = switchTriggerEl.classList.toggle('active')
    switchTriggerEl.setAttribute('aria-pressed', active ? 'true' : 'false')
  })
})
// js-docs-end switch-icon-init
```

- The attribute API stays `data-bs-*`. Renaming it to `data-tblr-*` is a breaking change held for 2.0 — do not start it here.
- Keep the accessible state in sync with the class (`aria-pressed`, `aria-expanded`), as above.
- A new module must be imported from `js/tabler.ts`, or it never ships.
- Shared helpers go to `js/src/tabler.ts` (`prefix`, `hexToRgba`, `getColor`), which reads theme values through `--tblr-*` custom properties.

## 4. Docs markers

`js-docs-start <name>` / `js-docs-end <name>` mark the snippet a documentation page shows for that behaviour (`docs/components/CodeDocs.astro`, `docs/lib/llms.ts`). Keep the marked region self-contained and copy-pasteable, and check who references the name before renaming it.

## 5. Tests

Tests run in a **real browser** — vitest browser mode with Playwright Chromium, not jsdom:

```bash
pnpm --filter @tabler/core test:js
pnpm --filter @tabler/core test:js:watch
pnpm --filter @tabler/core test:js:coverage
```

- `js/tests/unit/**/*.spec.ts` — behaviour, using `js/tests/helpers/fixture.ts` to mount markup.
- `js/tests/visual/*.html` — pages for looking at a component by hand.
- The first run needs Playwright's browser installed; if it fails on a missing binary, install it rather than switching the config to jsdom.

## 6. Build and budget

`vite` builds each entry as a library in `es` + `umd` (`BASE_NAME` selects the entry), then terser produces the `.min` variants with source maps. Sizes are enforced:

| File | Limit |
| --- | --- |
| `dist/js/tabler.js` | 64 kB |
| `dist/js/tabler.min.js` | 48 kB |
| `dist/js/tabler-theme.js` | 1 kB |

```bash
pnpm --filter @tabler/core build
pnpm run bundlewatch
```

Prefer a small dependency-free implementation over pulling a package in: every kilobyte here lands on every Tabler page.

## 7. Checklist

- [ ] New module imported from `js/tabler.ts` (or deliberately kept out of the bundle)
- [ ] `data-bs-*` attribute API unchanged; accessible state updated with the class
- [ ] Bootstrap-port changes stay close to upstream and come with a `js/tests/unit` spec
- [ ] `js-docs-*` markers intact and self-contained
- [ ] `pnpm --filter @tabler/core test` (js + scss) clean
- [ ] `pnpm run type-check` and `pnpm run lint:prettier` clean
- [ ] `pnpm run bundlewatch` within budget, or the new limit justified in the PR
- [ ] Docs page updated and changeset written

License

Declared license: MIT

MIT License

Copyright (c) 2018 tabler

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

View the license in the source repository — the version published there is authoritative.

core-js | SkillHub | SkillHub