Detect React Objects - Components and Elements

detect-react-object.js

function isClassComponent(component) {
  return typeof component === 'function'
    && !!component.prototype.isReactComponent
}

function isFunctionComponent(component) {
  return typeof component === 'function'
    // && !!String(component).includes('return React.createElement')  // may fails
    && React.isValidElement(Component())
}

function isReactComponent(component) {
  return isClassComponent(component) || isFunctionComponent(component)
}

function isElement(element) {
  return React.isValidElement(element);
}

function isDOMTypeElement(element) {
  return isElement(element) && typeof element.type === 'string';
}

function isCompositeTypeElement(element) {
  return isElement(element) && typeof element.type === 'function';
}

// As suggested in https://stackoverflow.com/questions/33199959/how-to-detect-a-react-component-vs-a-react-element

Nice one! Thanks for sharing. 🎉

---

There's one thing tho.

&& React.isValidElement(Component())

This may fail as well, when your Component uses hooks by throwing following error:

id hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: 1. You might have mismatching versions of React and the renderer (such as React DOM) 2. You might be breaking the Rules of Hooks 3. You might have more than one copy of React in the same app See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem.