its-fine

A collection of escape hatches exploring React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED. I'm sure you want me to tell you how safe and stable this all is.

As such, you can go beyond React's component abstraction; components are self-aware and can tap into the React Fiber tree. This enables powerful abstractions like stateless queries and sharing React Context across concurrent renderers.

Table of Contents

• Components
  • FiberProvider
• Hooks
  • useFiber
  • useContainer
  • useNearestChild
  • useNearestParent
  • useContextBridge
• Utils
  • traverseFiber

Components

FiberProvider

A react-internal Fiber provider. This component binds React children to the React Fiber tree. Call its-fine hooks within this.

Note: pmndrs renderers like react-three-fiber implement this internally to make use of useContextBridge, so you would only need this when using hooks inside of react-dom or react-native.

import * as ReactDOM from 'react-dom/client'
import { FiberProvider, useFiber } from 'its-fine'

function App() {
  const fiber = useFiber()
}

createRoot(document.getElementById('root')!).render(
  <FiberProvider>
    <App />
  </FiberProvider>,
)

Hooks

Useful React hook abstractions for manipulating and querying from a component. These must be called within a FiberProvider component.

useFiber

Returns the current react-internal Fiber. This is an implementation detail of react-reconciler.

import * as React from 'react'
import { type Fiber, useFiber } from 'its-fine'

function Component() {
  // Returns the current component's react-internal Fiber
  const fiber: Fiber<null> | undefined = useFiber()

  // function Component() {}
  if (fiber) console.log(fiber.type)
}

useContainer

Returns the current react-reconciler container info passed to Reconciler.createContainer.

In react-dom, a container will point to the root DOM element; in react-three-fiber, it will point to the root Zustand store.

import * as React from 'react'
import { useContainer } from 'its-fine'

function Component() {
  // Returns the current renderer's root container
  const container: HTMLDivElement | undefined = useContainer<HTMLDivElement>()

  // <div> (e.g. react-dom)
  if (container) console.log(container)
}

useNearestChild

Returns the nearest react-reconciler child instance or the node created from Reconciler.createInstance.

In react-dom, this would be a DOM element; in react-three-fiber this would be an Instance descriptor.

import * as React from 'react'
import { useNearestChild } from 'its-fine'

function Component() {
  // Returns a React Ref which points to the nearest child <div /> element.
  // Omit the element type to match the nearest element of any kind
  const childRef: React.MutableRefObject<HTMLDivElement | undefined> = useNearestChild<HTMLDivElement>('div')

  // Access child Ref on mount
  React.useEffect(() => {
    // <div> (e.g. react-dom)
    const child = childRef.current
    if (child) console.log(child)
  }, [])

  // A child element, can live deep down another component
  return <div />
}

useNearestParent

Returns the nearest react-reconciler parent instance or the node created from Reconciler.createInstance.

In react-dom, this would be a DOM element; in react-three-fiber this would be an instance descriptor.

import * as React from 'react'
import { useNearestParent } from 'its-fine'

function Component() {
  // Returns a React Ref which points to the nearest parent <div /> element.
  // Omit the element type to match the nearest element of any kind
  const parentRef: React.MutableRefObject<HTMLDivElement | undefined> = useNearestParent<HTMLDivElement>('div')

  // Access parent Ref on mount
  React.useEffect(() => {
    // <div> (e.g. react-dom)
    const parent = parentRef.current
    if (parent) console.log(parent)
  }, [])
}

// A parent element wrapping Component, can live deep up another component
;<div>
  <Component />
</div>

useContextBridge

React Context currently cannot be shared across React renderers but explicitly forwarded between providers (see react#17275). This hook returns a ContextBridge of live context providers to pierce Context across renderers.

Pass ContextBridge as a component to a secondary renderer to enable context-sharing within its children.

import * as React from 'react'
// react-nil is a secondary renderer that is usually used for testing.
// This also includes Fabric, react-three-fiber, etc
import * as ReactNil from 'react-nil'
// react-dom is a primary renderer that works on top of a secondary renderer.
// This also includes react-native, react-pixi, etc.
import * as ReactDOM from 'react-dom/client'
import { type ContextBridge, useContextBridge, FiberProvider } from 'its-fine'

function Canvas(props: { children: React.ReactNode }) {
  // Returns a bridged context provider that forwards context
  const Bridge: ContextBridge = useContextBridge()
  // Renders children with bridged context into a secondary renderer
  ReactNil.render(<Bridge>{props.children}</Bridge>)
}

// A React Context whose provider lives in react-dom
const DOMContext = React.createContext<string>(null!)

// A component that reads from DOMContext
function Component() {
  // "Hello from react-dom"
  console.log(React.useContext(DOMContext))
}

// Renders into a primary renderer like react-dom or react-native,
// DOMContext wraps Canvas and is bridged into Component
ReactDOM.createRoot(document.getElementById('root')!).render(
  <FiberProvider>
    <DOMContext.Provider value="Hello from react-dom">
      <Canvas>
        <Component />
      </Canvas>
    </DOMContext.Provider>
  </FiberProvider>,
)

Utils

Additional exported utility functions for raw handling of Fibers.

traverseFiber

Traverses up or down a Fiber, return true to stop and select a node.

import { type Fiber, traverseFiber } from 'its-fine'

// Traverses through the Fiber tree, returns the current node when `true` is passed via selector
const parentDiv: Fiber<HTMLDivElement> | undefined = traverseFiber<HTMLDivElement>(
  // Input Fiber to traverse
  fiber as Fiber,
  // Whether to ascend and walk up the tree. Will walk down if `false`
  true,
  // A Fiber node selector, returns the first match when `true` is passed
  (node: Fiber<HTMLDivElement | null>) => node.type === 'div',
)