udemy-react/02/node_modules/eslint-plugin-react/lib/rules/jsx-uses-vars.js

/**
 * @fileoverview Prevent variables used in JSX to be marked as unused
 * @author Yannick Croissant
 */

'use strict';

const docsUrl = require('../util/docsUrl');

// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------

module.exports = {
  meta: {
    docs: {
      description: 'Prevent variables used in JSX to be marked as unused',
      category: 'Best Practices',
      recommended: true,
      url: docsUrl('jsx-uses-vars')
    },
    schema: []
  },

  create(context) {
    return {
      JSXOpeningElement(node) {
        let name;
        if (node.name.namespace && node.name.namespace.name) {
          // <Foo:Bar>
          name = node.name.namespace.name;
        } else if (node.name.name) {
          // <Foo>
          name = node.name.name;
        } else if (node.name.object) {
          // <Foo...Bar>
          let parent = node.name.object;
          while (parent.object) {
            parent = parent.object;
          }
          name = parent.name;
        } else {
          return;
        }

        context.markVariableAsUsed(name);
      }

    };
  }
};