App.jsx

import React, { Component } from 'react';
import SmartComponent from './SmartComponent';

export default class App extends Component {
  render() {
    return <SmartComponent name="World" />;
  }
}

DumbComponent.jsx

import React from 'react';
import PropTypes from 'prop-types';

export default function DumbComponent({ greeting, name}) {
    return <h1>{greeting} {name}</h1>
}

DumbComponent.propTypes = {
  greeting: PropTypes.string,
  name: PropTypes.string
}

propsBuilder.js

export default function buildProps(props, propKeys) {
  const flatProps = props.isArray() ? Object.assign({}, ...props) : props;
  const builtProps = {};

  for (const key of propKeys) {
    if (key in flatProps) {
      builtProps[key] = flatProps[key];
    }
  }

  return builtProps;
}

SmartComponent.jsx

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import buildProps from '../lib/propsBuilder';
import DumpComponent from './DumpComponent';

export default class SmartComponent extends Component {
  state = {
    greeting: 'Hello, ';
  }

  dumbComponentProps = buildProps(
    [this.props, this.state],
    Object.keys(DumbComponent.propTypes)
  );

  render() {
    return <DumbComponent {...this.dumbComponentProps} />;
  }
}

I really like this approach largely for the line DumbComponent.propTypes if we were to copy-paste this pattern around to the smart components in the app, it would strongly encourage prop-type usage in the dumb components. This, in my mind, is a move toward best practices in that the more dumb components that have prop types - the better!