@react-navigation/core/lib/module/validatePathConfig.js

Core utilities for building navigators

const formatToList = items => items.map(key => `- ${key}`).join('\n');
export default function validatePathConfig(config) {
  let root = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
  const validKeys = ['initialRouteName', 'screens'];
  if (!root) {
    validKeys.push('path', 'exact', 'stringify', 'parse');
  }
  const invalidKeys = Object.keys(config).filter(key => !validKeys.includes(key));
  if (invalidKeys.length) {
    throw new Error(`Found invalid properties in the configuration:\n${formatToList(invalidKeys)}\n\nDid you forget to specify them under a 'screens' property?\n\nYou can only specify the following properties:\n${formatToList(validKeys)}\n\nSee https://reactnavigation.org/docs/configuring-links for more details on how to specify a linking configuration.`);
  }
  if (config.screens) {
    Object.entries(config.screens).forEach(_ref => {
      let [_, value] = _ref;
      if (typeof value !== 'string') {
        validatePathConfig(value, false);
      }
    });
  }
}
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