export function childrenPropType()

in src/helpers/propTypes.js [4:52]
45 lines of code
12 McCabe index (conditional complexity)

export function childrenPropType(props, propName, componentName) {
  let error;
  let tabsCount = 0;
  let panelsCount = 0;
  let tabListFound = false;
  const listTabs = [];
  const children = props[propName];

  deepForEach(children, (child) => {
    if (isTabList(child)) {
      if (
        child.props &&
        child.props.children &&
        typeof child.props.children === 'object'
      ) {
        deepForEach(child.props.children, (listChild) =>
          listTabs.push(listChild),
        );
      }

      if (tabListFound) {
        error = new Error(
          "Found multiple 'TabList' components inside 'Tabs'. Only one is allowed.",
        );
      }
      tabListFound = true;
    }
    if (isTab(child)) {
      if (!tabListFound || listTabs.indexOf(child) === -1) {
        error = new Error(
          "Found a 'Tab' component outside of the 'TabList' component. 'Tab' components " +
            "have to be inside the 'TabList' component.",
        );
      }
      tabsCount++;
    } else if (isTabPanel(child)) {
      panelsCount++;
    }
  });

  if (!error && tabsCount !== panelsCount) {
    error = new Error(
      `There should be an equal number of 'Tab' and 'TabPanel' in \`${componentName}\`. ` +
        `Received ${tabsCount} 'Tab' and ${panelsCount} 'TabPanel'.`,
    );
  }

  return error;
}