Omi

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Omi - Front End Cross-Frameworks Framework

import { tag, WeElement, h, render } from 'omi'

@tag('hello-world')
class HelloWorld extends WeElement {
  static css = 'p { color: red }'
  
  render(props) {
    return (
      <>
        <h1>Omi</h1>
        <p>Hello {props.msg}</p>
      </>
    )
  }
}

render(<hello-world msg='World' />, 'body')

• 💯Omi Tutorial and Playground

Why Omi?

• Cross frameworks, components of omi are pure custom elements
• Tiny size and High performance
• One framework. Mobile & desktop & mini program
• Compliance with browser trend and API design
• Merge Web Components, JSX/TSX into one framework
• JSX/TSX is the best development experience (code intelligent completion and tip) UI Expression with least grammatical noise and it's turing complete(template engine is not, es template string is but grammatical noise is too loud)
• Look at Facebook React vs Web Components，Omi combines their advantages and gives developers the freedom to choose the way they like
• Shadow DOM or Light DOM merges with Virtual DOM, Omi uses both virtual DOM and real Shadow DOM to make view updates more accurate and faster
• Scoped CSS's best solution is Shadow DOM, the community churning out frameworks and libraries for Scoped CSS (using JS or JSON writing styles such as Radium, jsxstyle, react-style; binding to webpack using generated unique className filename-classname-hash, such as CSS Modules, Vue), are hack technologies; _and Shadow DOM Style is the perfect solution
• Be friendly to custom elements, you can pass false attributes to elements through string '0' or string 'false', you can pass object attributes to elements through : prefix and Omi.$
• Enhanced CSS, rpx unit support base on 750 screen width

New Project

$ npx omi-cli init my-app     # init project
$ cd my-app           
$ npm start           # develop
$ npm run build       # release

New Component

$ npx omi-cli init-component my-component     # init project
$ cd my-app           
$ npm start           # develop
$ npm run build       # release

Usage with TypeScript

Define cross-frameworks button element with TypeScript:

import { tag, WeElement, h, extractClass } from 'omi'
import * as css from './index.scss'

interface Props {
  size?: 'medium' | 'small' | 'mini',
  type?: 'primary' | 'success' | 'warning' | 'danger' | 'info' | 'text'
  plain?: boolean,
  round?: boolean,
  circle?: boolean,
  loading?: boolean,
  disabled?: boolean,
  icon?: string,
  autofocus?: boolean,
  nativeType?: 'button' | 'submit' | 'reset',
  block?: boolean
  text?: string
}

@tag('o-button')
export default class Button extends WeElement<Props>{
  static css = css

  static defaultProps = {
    plain: false,
    round: false,
    circle: false,
    loading: false,
    disabled: false,
    autofocus: false,
    nativeType: 'button',
    block: false
  }

  static propTypes = {
    size: String,
    type: String,
    plain: Boolean,
    round: Boolean,
    circle: Boolean,
    loading: Boolean,
    disabled: Boolean,
    icon: String,
    autofocus: Boolean,
    nativeType: String,
    block: Boolean,
    text: String
  }

  render(props) {
    return <button disabled={props.disabled} {...extractClass(props, 'o-button', {
      ['o-button-' + props.type]: props.type,
      ['o-button-' + props.size]: props.size,
      'is-plain': props.plain,
      'is-round': props.round,
      'is-circle': props.circle,
      'is-disabled': props.disabled,
      'is-block': props.block
    })} type={props.nativeType} >
      {props.loading && <i class='icon-loading'></i>}
      {props.text}
      <slot></slot>
    </button>
  }
}

TypeScript Auto Complete

import { h, WeElement, tag, classNames } from 'omi';
import * as styles from './_index.less';

interface ButtonProps {
  href?: string,
  disabled?: boolean,
  type?: 'default' | 'primary' | 'danger',
  htmltype?: 'submit' | 'button' | 'reset',
  onClick?: (e: any) => void
}

const TAG = 'o-button'

declare global {
  namespace JSX {
    interface IntrinsicElements {
      [TAG]: Omi.Props & ButtonProps
    }
  }
}

@tag(TAG)
export default class oButton extends WeElement<ButtonProps> {
...
...
...

Browsers Support

Omi works in the latest two versions of all major browsers: Safari 10+, IE 11+, and the evergreen Chrome, Firefox, and Edge.

→ Polyfills

<script src="https://unpkg.com/@webcomponents/we[email protected]/webcomponents-bundle.js"></script>

Contributors

Any form of contribution is welcome. The above contributors have been officially released by Tencent.

We very much welcome developers to contribute to Tencent's open source, and we will also give them incentives to acknowledge and thank them. Here we provide an official description of Tencent's open source contribution. Specific contribution rules for each project are formulated by the project team. Developers can choose the appropriate project and participate according to the corresponding rules. The Tencent Project Management Committee will report regularly to qualified contributors and awards will be issued by the official contact.

Please contact us for any questions.

Examples

Project	Description
snake & → Touch the demo	The Snake-Eating Game Based on MVP Architecture Written by Omi
custom-elements-everywhere	Making sure frameworks and custom elements can be BFFs 🍻
omi-piano	Build piano with Omi and Omi Snippets, Enjoy now!
omi-devtools	Browser DevTools extension
omi-chart	Simple HTML5 Charts using chart-x tag.
md2site	Static Site Generator with markdown powered by Omio.
omi-30-seconds	Useful Omi snippets that you can understand in 30 seconds.
omi-canvas	Perfect fusion of web components, jsx and canvas.
omi-swiper	Omi + Swiper
omi-vscode	VSCode extension for omi, Install now!
omi-ex	Omi.js extension(TypeScript)
omi-transform	Omi / css3transform integration. Made css3 transform super easy in your Omi project.
omi-finger	Support touch and gesture events in your Omi project.
omi-touch	Smooth scrolling, rotation, pull to refresh and any motion for the web.
omi-i18n	Internationalization solution for omi.js using i18next ecosystem
omie	Build cross platform desktop apps with Omi.js and Electron.js
omi-cv	Create a front-end engineer curriculum vitae, Get Started!

Useful Resources

License

MIT © Tencent