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Beam react children to other parts of the React subtree




React Beam

Allows children to other parts of the React subtree, and updates when needed. Originally designed for use with React Router in an app which has a common element such as a header with a title, where a component in the page subtree might want to change the title.


npm i @azmenak/react-beam



import { Receiver } from 'react-beam';


  • link:<String>: a unique ID, used to send children to the correct component
  • onUpdate:<Function (children)> (optional): runs whenever an update is received, with children as the only argument
  • children:<ReactNode> (optional): renders child node(s) when the recevied children are null or undefined
  • style:<Object> (optional): style will be shallowly mixed in when there is 1 child node, or is applied to a new <span> root node
  • className:<String> (optional): applied to child node when there is 1 child node, or applied to new <span> root node


Always renders null.

import { Transmitter } from 'react-beam';


  • link:<String> a unique ID, used to send children to the correct component
  • children:<ReactNode> children to render in the <Receiver /> component


// AppHeader.jsx

import React from 'react';
import { Receiver } from 'react-beam';

export class AppHeader extends React.Component {
  render() {
    return (
        { // ...other stuff }
        <Recevier link="header" />
// SomePage.jsx

import React from 'react';
import { Transmitter } from 'react-beam';

export class SomePage extends React.Component {
  render() {
    return (
        { // stuff }
        <Transmitter link="header">
          <span>Page dependent content</span>
          <span>More content</span>