src prop-types.js

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  export const naturalNumber = function (props, propName, componentName) {
  if (typeof props[propName] !== 'number' || props[propName] % 1 !== 0 || props[propName] < 0) {
    return new Error('Invalid prop `' + propName + '` supplied to' + ' `' + componentName + '`. Validation failed.')
  }
}