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lit

A library for building fast, lightweight web components

  • 3.2.1
  • latest
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  • npm
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What is lit?

The lit npm package is a simple and fast library for building web components and web applications. It allows developers to create reusable, encapsulated, and interactive elements using modern JavaScript and Web Component standards. Lit is designed to be lightweight and efficient, focusing on speed and minimal overhead.

What are lit's main functionalities?

Creating Web Components

This feature allows developers to create custom web components using the LitElement base class. The example demonstrates defining a new element with a simple style and rendering method.

import { LitElement, html, css } from 'lit';

class MyElement extends LitElement {
  static styles = css`p { color: blue; }`;

  render() {
    return html`<p>Hello, world!</p>`;
  }
}
customElements.define('my-element', MyElement);

Reactive Properties

This feature showcases Lit's reactive property system. The example includes a counter component that updates its display whenever the 'count' property changes.

import { LitElement, html, css, property } from 'lit';

class MyCounter extends LitElement {
  @property({ type: Number }) count = 0;

  render() {
    return html`
      <button @click=${this._increment}>Increment</button>
      <span>${this.count}</span>
    `;
  }

  _increment() {
    this.count++;
  }
}
customElements.define('my-counter', MyCounter);

Styling Components

This feature demonstrates how to apply CSS styles to a Lit component. The example shows defining styles for the component itself and its internal elements.

import { LitElement, html, css } from 'lit';

class StyledElement extends LitElement {
  static styles = css`
    :host {
      display: block;
      border: 1px solid black;
      padding: 16px;
      max-width: 200px;
    }
    .highlight {
      color: red;
    }
  `;

  render() {
    return html`<div class='highlight'>Styled Content</div>`;
  }
}
customElements.define('styled-element', StyledElement);

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Package last updated on 07 Oct 2024

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