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

'use strict';

/**
 * @fileoverview Rule to disallow anonymous default exports.
 * @author Duncan Beevers
 */

const defs = {
  ArrayExpression: {
    option: 'allowArray',
    description: 'If `false`, will report default export of an array',
    message: 'Assign array to a variable before exporting as module default'
  },
  ArrowFunctionExpression: {
    option: 'allowArrowFunction',
    description: 'If `false`, will report default export of an arrow function',
    message: 'Assign arrow function to a variable before exporting as module default'
  },
  ClassDeclaration: {
    option: 'allowAnonymousClass',
    description: 'If `false`, will report default export of an anonymous class',
    message: 'Unexpected default export of anonymous class',
    forbid: node => !node.declaration.id
  },
  FunctionDeclaration: {
    option: 'allowAnonymousFunction',
    description: 'If `false`, will report default export of an anonymous function',
    message: 'Unexpected default export of anonymous function',
    forbid: node => !node.declaration.id
  },
  Literal: {
    option: 'allowLiteral',
    description: 'If `false`, will report default export of a literal',
    message: 'Assign literal to a variable before exporting as module default'
  },
  ObjectExpression: {
    option: 'allowObject',
    description: 'If `false`, will report default export of an object expression',
    message: 'Assign object to a variable before exporting as module default'
  },
  TemplateLiteral: {
    option: 'allowLiteral',
    description: 'If `false`, will report default export of a literal',
    message: 'Assign literal to a variable before exporting as module default'
  }
};

const schemaProperties = Object.keys(defs).map(key => defs[key]).reduce((acc, def) => {
  acc[def.option] = {
    description: def.description,
    type: 'boolean',
    default: false
  };

  return acc;
}, {});

module.exports = {
  meta: {
    schema: [{
      type: 'object',
      properties: schemaProperties,
      'additionalProperties': false
    }]
  },

  create: function (context) {
    const options = Object.assign({}, context.options[0]);

    return {
      'ExportDefaultDeclaration': node => {
        const def = defs[node.declaration.type];

        // Recognized node type and allowed by configuration,
        //   and has no forbid check, or forbid check return value is truthy
        if (def && !options[def.option] && (!def.forbid || def.forbid(node))) {
          context.report({ node, message: def.message });
        }
      }
    };
  }
};
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