no-named-export.js

import sourceType from '../core/sourceType';
import docsUrl from '../docsUrl';

module.exports = {
  meta: {
    type: 'suggestion',
    docs: {
      category: 'Style guide',
      description: 'Forbid named exports.',
      url: docsUrl('no-named-export'),
    },
    schema: [],
  },

  create(context) {
    // ignore non-modules
    if (sourceType(context) !== 'module') {
      return {};
    }

    const message = 'Named exports are not allowed.';

    return {
      ExportAllDeclaration(node) {
        context.report({ node, message });
      },

      ExportNamedDeclaration(node) {
        if (node.specifiers.length === 0) {
          return context.report({ node, message });
        }

        const someNamed = node.specifiers.some((specifier) => (specifier.exported.name || specifier.exported.value) !== 'default');
        if (someNamed) {
          context.report({ node, message });
        }
      },
    };
  },
};