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What is TailNG?

TailNG is an open-source Angular UI system for applications and design systems that need accessible behavior, strict type safety, and implementation ownership.

The monorepo provides:

• Ready-to-use styled Angular components.
• Headless primitives for custom UI systems.
• Low-level accessibility, collection, overlay, and runtime utilities.
• Theme contracts, CSS variable tooling, and Tailwind adapters.
• A copy-source registry and CLI for shadcn-style local component ownership.
• Documentation and playground apps for package, Tailwind, plain CSS, and registry workflows.

TailNG is built with Angular 21+, standalone APIs, signals, Nx, Vitest, and strict ESLint boundaries.

Packages

Package	Description
@tailng-ui/components	Styled Angular components built on TailNG primitives.
@tailng-ui/primitives	Headless, accessibility-first Angular primitives.
@tailng-ui/cdk	Behavior, accessibility, collection, overlay, and runtime utilities.
@tailng-ui/theme	Theme contracts, presets, CSS variables, component contracts, and Tailwind adapters.
@tailng-ui/icons	Angular icon wrappers backed by @ng-icons.
@tailng-ui/charts	Apache ECharts wrappers for Angular.
@tailng-ui/registry	Metadata for ownable component installs.
tailng	CLI for listing and copying ownable components into Angular apps.

Installation

Install styled components:

pnpm add @tailng-ui/components @tailng-ui/primitives @tailng-ui/cdk

Install headless primitives:

pnpm add @tailng-ui/primitives @tailng-ui/cdk

Install the theme package:

pnpm add @tailng-ui/theme

Use the ownable-source CLI without adding it permanently:

pnpm dlx tailng list
pnpm dlx tailng add button

Primary peer dependencies:

• @angular/core ^21.1.0
• @angular/common ^21.1.0
• @angular/forms ^21.1.0
• @angular/platform-browser ^21.1.0
• @angular/router ^21.1.0
• tslib ^2.3.0

Package-specific peer dependencies are listed in each package README.

Quick Example

import { Component } from '@angular/core';
import { TngButton } from '@tailng-ui/components';

@Component({
  standalone: true,
  imports: [TngButton],
  template: `<tng-button tone="success">Continue</tng-button>`,
})
export class ExampleComponent {}

For headless usage:

import { Component } from '@angular/core';
import { TngPress } from '@tailng-ui/primitives';

@Component({
  standalone: true,
  imports: [TngPress],
  template: `<button tngPress>Action</button>`,
})
export class ExampleComponent {}

Architecture

TailNG is organized as an Nx workspace with layered packages:

apps/
  tailng-ui/
    docs/                  Documentation site
    playground-plain-css/  Plain CSS playground
    playground-registry/   Ownable install playground
    playground-tailwind/   Tailwind playground

libs/
  tailng/
    cli/                   tailng command-line tool
  tailng-ui/
    cdk/                   Headless behavior and runtime utilities
    primitives/            Headless Angular primitives
    components/            Styled Angular components
    theme/                 Theme engine and CSS contracts
    icons/                 Icon wrappers
    charts/                Chart wrappers
    registry/              Ownable install metadata

Layering rules:

• Components depend on primitives and CDK contracts.
• Primitives depend on CDK behavior utilities.
• Styling is separated from behavior.
• Public APIs are exported from package entry points.
• Deep imports are avoided.
• Accessibility and keyboard behavior are treated as package contracts.

Product Direction

TailNG is moving toward a component platform that supports both package installs and source ownership.

Current priorities:

• Accessibility-first primitives and components.
• Wrapper abstractions that keep app usage simple.
• Component style contracts for slots, states, tokens, and hooks.
• No hard dependency on Tailwind or any single CSS framework.
• Copy-source installation through the tailng CLI.
• Stable package boundaries across CDK, primitives, components, theme, registry, and docs.

Development

Requirements:

• Node.js >=20.20.0
• pnpm >=10.30.0

Install dependencies:

pnpm install

Run the documentation site:

pnpm start:docs

Run playgrounds:

pnpm start:vanilla
pnpm start:tailwind

Build packages and apps:

pnpm run build

Build selected targets:

pnpm run build:docs
pnpm run build:theme
pnpm run build:cli
pnpm run build:vanilla
pnpm run build:tailwind

Build and publish docs locally (Cloudflare Pages):

CF_DOCS_PROJECT_NAME=taling-dev \
CLOUDFLARE_API_TOKEN=90Oh4-tjMr9Fxj8naoK_8odkfw8QdbHpS-CVNTf- \
CLOUDFLARE_ACCOUNT_ID=218f66f3a999f3f020117242ec252f18 \
./tools/build-deploy-docs.sh

Notes:

• CF_DOCS_PROJECT_NAME maps to the Cloudflare Pages project name.
• CLOUDFLARE_API_TOKEN and CLOUDFLARE_ACCOUNT_ID are required by wrangler.
• If needed, you can override branch and output behavior with CF_PAGES_BRANCH and DOCS_DIST.

Generate static output:

pnpm run seo:docs
pnpm run seo:vanilla
pnpm run seo:tailwind

If prerendering fails because Chrome is missing, install the browser once:

pnpm exec puppeteer browsers install chrome

Testing and Quality

Run all package tests:

pnpm run test:packages

Run the full Vitest suite:

pnpm run test:all

Run targeted tests:

pnpm run test:cdk
pnpm run test:primitives
pnpm run test:components
pnpm run test:theme
pnpm run test:icons
pnpm run test:charts
pnpm run test:registry
pnpm run test:cli
pnpm run test:docs

Lint and format:

pnpm run lint
pnpm run format:nx
pnpm run format:prettier

Typecheck key package surfaces:

pnpm run typecheck:registry
pnpm run typecheck:cli
pnpm run typecheck:docs

Run the ownable install contract checks:

pnpm run verify:ownable-contracts

TailNG CLI

Build and run the local CLI:

pnpm run build:cli
pnpm run run:tailng -- list

Preview generated files:

pnpm run run:tailng -- add button --cwd apps/tailng-ui/playground-registry --dry-run

Generate files:

pnpm run run:tailng -- add button --cwd apps/tailng-ui/playground-registry

Overwrite existing generated files:

pnpm run run:tailng -- add button --cwd apps/tailng-ui/playground-registry --force

tailng add <component-name> writes source under:

<cwd>/src/app/tailng-ui/<component>/

Import generated components from the local app path:

import { TngButton } from './tailng-ui/button';

Common aliases supported by tailng add:

Alias	Canonical item
slide-toggle	switch
sidenav, sidebar, side-nav, sheet	drawer
expansion-panel	accordion
spinner	progress-spinner
snackbar, sonner	toast

Component Guidelines

• Use standalone Angular APIs.
• Prefer signals and input() for component inputs.
• Keep behavior and styling separate.
• Avoid default exports.
• Use explicit return types.
• Keep public APIs intentional and documented.
• Preserve accessibility semantics, roles, states, and keyboard behavior.
• Add or update tests when changing behavior.

Documentation

• Website: https://tailng.dev
• GitHub: https://github.com/tailng/tailng-ui
• npm components: @tailng-ui/components
• npm CLI: tailng

Contributing

Contributions are welcome.

Before submitting a PR:

• Run relevant tests and lint checks.
• Respect Nx boundaries and package layering.
• Avoid deep imports.
• Keep typing strict.
• Include docs or playground coverage for user-facing changes.

License

MIT © 2026 TailNG