no-commonjs.js

'use strict';

var _docsUrl = require('../docsUrl');

var _docsUrl2 = _interopRequireDefault(_docsUrl);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const EXPORT_MESSAGE = 'Expected "export" or "export default"',
      IMPORT_MESSAGE = 'Expected "import" instead of "require()"'; /**
                                                                    * @fileoverview Rule to prefer ES6 to CJS
                                                                    * @author Jamund Ferguson
                                                                    */

function normalizeLegacyOptions(options) {
  if (options.indexOf('allow-primitive-modules') >= 0) {
    return { allowPrimitiveModules: true };
  }
  return options[0] || {};
}

function allowPrimitive(node, options) {
  if (!options.allowPrimitiveModules) return false;
  if (node.parent.type !== 'AssignmentExpression') return false;
  return node.parent.right.type !== 'ObjectExpression';
}

function allowRequire(node, options) {
  return options.allowRequire;
}

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

const schemaString = { enum: ['allow-primitive-modules'] };
const schemaObject = {
  type: 'object',
  properties: {
    allowPrimitiveModules: { 'type': 'boolean' },
    allowRequire: { 'type': 'boolean' }
  },
  additionalProperties: false
};

module.exports = {
  meta: {
    docs: {
      url: (0, _docsUrl2.default)('no-commonjs')
    },

    schema: {
      anyOf: [{
        type: 'array',
        items: [schemaString],
        additionalItems: false
      }, {
        type: 'array',
        items: [schemaObject],
        additionalItems: false
      }]
    }
  },

  create: function (context) {
    const options = normalizeLegacyOptions(context.options);

    return {

      'MemberExpression': function (node) {

        // module.exports
        if (node.object.name === 'module' && node.property.name === 'exports') {
          if (allowPrimitive(node, options)) return;
          context.report({ node, message: EXPORT_MESSAGE });
        }

        // exports.
        if (node.object.name === 'exports') {
          const isInScope = context.getScope().variables.some(variable => variable.name === 'exports');
          if (!isInScope) {
            context.report({ node, message: EXPORT_MESSAGE });
          }
        }
      },
      'CallExpression': function (call) {
        if (context.getScope().type !== 'module') return;
        if (call.parent.type !== 'ExpressionStatement' && call.parent.type !== 'VariableDeclarator') return;

        if (call.callee.type !== 'Identifier') return;
        if (call.callee.name !== 'require') return;

        if (call.arguments.length !== 1) return;
        var module = call.arguments[0];

        if (module.type !== 'Literal') return;
        if (typeof module.value !== 'string') return;

        if (allowRequire(call, options)) return;

        // keeping it simple: all 1-string-arg `require` calls are reported
        context.report({
          node: call.callee,
          message: IMPORT_MESSAGE
        });
      }
    };
  }
};
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