BoxComponent.jsx

import {Component} from 'react';
import blessed from 'blessed';

export default class BoxComponent extends Component {
    constructor(props, context) {
        super(props, context);

        this.node = blessed.box(props);
    }

    render() {
        return this.node;
    }
}

index.jsx

import blessed from 'blessed';
import bunyan from 'bunyan';
import React from 'react';
import render from './render';
import Box from './comp/Box';

const log = bunyan.createLogger({
    level: 'debug',
    name: 'react-test',
    streams: [{
        path: './tmp/react-test.log'
    }]
});

function main(args) {
    const screen = blessed.screen();
    render(<Box />, {log, screen}, () => {
        log.info('render callback');
        screen.render();
    });
}

main(process.argv);

render.js

export default function render(element, {log, screen}, cb) {
    screen.append(element.node); // <-- how do I get this?
}