tessl/npm-inferno

An extremely fast, React-like JavaScript library for building modern user interfaces

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Overview

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Files

Core Rendering

Name: tessl/npm-inferno
Author: tessl

Main rendering functionality for mounting and updating virtual DOM trees to real DOM elements with high-performance reconciliation.

Capabilities

Render Function

Renders a virtual node tree into a DOM container element.

/**
 * Renders a virtual node tree into a DOM container element
 * @param input - VNode or InfernoNode to render
 * @param parentDOM - DOM element to render into
 * @param callback - Optional callback called after rendering completes
 * @param context - Optional context object passed to components
 */
function render(
  input: VNode | InfernoNode,
  parentDOM: ParentDOM,
  callback?: (() => void) | null,
  context?: ContextObject
): void;

Usage Examples:

import { render, createVNode } from "inferno";

// Basic rendering
const vnode = createVNode(1, 'div', null, 'Hello World');
render(vnode, document.getElementById('app'));

// With callback
render(vnode, document.getElementById('app'), () => {
  console.log('Render complete');
});

// With context
const context = { theme: 'dark' };
render(vnode, document.getElementById('app'), null, context);

Create Renderer

Creates a reusable renderer function bound to a specific DOM container.

/**
 * Creates a reusable renderer function bound to a specific DOM container
 * @param parentDOM - Optional DOM element to bind the renderer to
 * @returns Renderer function for multiple render calls
 */
function createRenderer(parentDOM?: ParentDOM): 
  (lastInput: any, nextInput: any, callback?: any, context?: any) => void;

Usage Examples:

import { createRenderer, createVNode } from "inferno";

// Create bound renderer
const renderer = createRenderer(document.getElementById('app'));

// Use renderer multiple times
renderer(null, createVNode(1, 'div', null, 'First render'));
renderer(lastVNode, createVNode(1, 'div', null, 'Updated content'));

// Create unbound renderer (container passed as first argument)
const unboundRenderer = createRenderer();
unboundRenderer(document.getElementById('app'), createVNode(1, 'h1', null, 'Title'));

Render Internal

Internal rendering implementation used by other inferno packages and advanced use cases.

/**
 * Internal rendering implementation used by other inferno packages
 * @param input - VNode or InfernoNode to render
 * @param parentDOM - DOM element to render into
 * @param callback - Optional callback called after rendering completes
 * @param context - Context object passed to components
 */
function renderInternal(
  input: VNode | InfernoNode,
  parentDOM: ParentDOM,
  callback: (() => void) | null,
  context: ContextObject
): void;

Rendering Process

The rendering process in Inferno follows these steps:

Input Validation: Validates the input VNode and parent DOM element
VNode Preparation: Clones VNodes if they're already in use to prevent conflicts
Mounting/Patching: Either mounts new content or patches existing content
Lifecycle Execution: Calls component lifecycle methods and animation hooks
Callback Execution: Invokes the optional callback after completion

Performance Optimizations

VNode Reuse: Clones VNodes that are already in use to enable safe reuse
Efficient Patching: Only updates changed parts of the DOM tree
Lifecycle Batching: Batches lifecycle calls for better performance
Animation Queuing: Efficiently manages animation lifecycle hooks

Error Handling

Common rendering errors and their causes:

Invalid Parent DOM: Throws error if parentDOM is null or invalid
Document Body Rendering: Development warning when trying to render to document.body
VNode Validation: Development-time validation of VNode structure

Context Passing

Context objects are passed down the component tree and available in component constructors and lifecycle methods:

// Parent component sets context
render(vnode, container, null, { theme: 'dark', locale: 'en' });

// Child components access context
class MyComponent extends Component {
  constructor(props, context) {
    super(props, context);
    console.log(context.theme); // 'dark'
  }
}