function checkPropTypes(componentName, propTypes, props, location) {
  for (var propName in propTypes) {
    if (propTypes.hasOwnProperty(propName)) {
      var error;
      // Prop type validation may throw. In case they do, we don't want to
      // fail the render phase where it didn't fail before. So we log it.
      // After these have been cleaned up, we'll let them throw.
      try {
        // This is intentionally an invariant that gets caught. It's the same
        // behavior as without this statement except with a better message.
        !(typeof propTypes[propName] === 'function') ? "development" !== 'production' ? invariant(false, '%s: %s type `%s` is invalid; it must be a function, usually from ' + 'React.PropTypes.', componentName || 'React class', ReactPropTypeLocationNames[location], propName) : invariant(false) : undefined;
        error = propTypes[propName](props, propName, componentName, location);
      } catch (ex) {
        error = ex;
      }
      "development" !== 'production' ? warning(!error || error instanceof Error, '%s: type specification of %s `%s` is invalid; the type checker ' + 'function must return `null` or an `Error` but returned a %s. ' + 'You may have forgotten to pass an argument to the type checker ' + 'creator (arrayOf, instanceOf, objectOf, oneOf, oneOfType, and ' + 'shape all require an argument).', componentName || 'React class', ReactPropTypeLocationNames[location], propName, typeof error) : undefined;
      if (error instanceof Error && !(error.message in loggedTypeFailures)) {
        // Only monitor this failure once because there tends to be a lot of the
        // same error.
        loggedTypeFailures[error.message] = true;

        var addendum = getDeclarationErrorAddendum();
        "development" !== 'production' ? warning(false, 'Failed propType: %s%s', error.message, addendum) : undefined;
      }
    }
  }
}
Assert that the props are valid

@param {string} componentName Name of the component for error messages.
@param {object} propTypes Map of prop name to a ReactPropType
@param {object} props
@param {string} location e.g. "prop", "context", "child context"
@private