eslint-plugin-import/lib/rules/no-default-export.js

'use strict';

module.exports = {
  meta: {
    docs: {}
  },

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

    const preferNamed = 'Prefer named exports.';
    const noAliasDefault = (_ref) => {
      let local = _ref.local;
      return `Do not alias \`${local.name}\` as \`default\`. Just export ` + `\`${local.name}\` itself instead.`;
    };

    return {
      ExportDefaultDeclaration(node) {
        context.report({ node, message: preferNamed });
      },

      ExportNamedDeclaration(node) {
        node.specifiers.forEach(specifier => {
          if (specifier.type === 'ExportDefaultSpecifier' && specifier.exported.name === 'default') {
            context.report({ node, message: preferNamed });
          } else if (specifier.type === 'ExportSpecifier' && specifier.exported.name === 'default') {
            context.report({ node, message: noAliasDefault(specifier) });
          }
        });
      }
    };
  }
};
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