PropTypes.component

prop-type-react-component.js

import { isValidElementType } from 'react-is';

function PropTypeError(message) {
  this.message = message;
  this.stack = '';
}
PropTypeError.prototype = Error.prototype;

const createPropTypesComponent = isRequired => (
  props,
  propName,
  componentName,
  location,
  propFullName,
) => {
  const prop = props[propName];

  propFullName = propFullName || propName;

  if (prop == null) {
    if (isRequired) {
      if (prop === null) {
        return new PropTypeError(
          `The ${location} \`${propFullName}\` is marked as required ` +
            `in \`${componentName}\`, but its value is \`null\`.`,
        );
      }
      return new PropTypeError(
        `The ${location} \`${propFullName}\` is marked as required in ` +
          `\`${componentName}\`, but its value is \`undefined\`.`,
      );
    }
    return null;
  }
  if (!isValidElementType(prop)) {
    return new PropTypeError(
      `Invalid ${location} \`${propFullName}\` supplied to \`${componentName}\`, expected a valid React component.`,
    );
  }

  return null;
};