odin-default-js-exercises/node_modules/eslint-plugin-import/lib/rules/no-commonjs.js

'use strict';

/**
 * @fileoverview Rule to prefer ES6 to CJS
 * @author Jamund Ferguson
 */

const EXPORT_MESSAGE = 'Expected "export" or "export default"',
      IMPORT_MESSAGE = 'Expected "import" instead of "require()"';

function allowPrimitive(node, context) {
  if (context.options.indexOf('allow-primitive-modules') < 0) return false;
  if (node.parent.type !== 'AssignmentExpression') return false;
  return node.parent.right.type !== 'ObjectExpression';
}

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


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

  create: function (context) {

    return {

      'MemberExpression': function (node) {

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

        // exports.
        if (node.object.name === 'exports') {
          context.report({ node, message: EXPORT_MESSAGE });
        }
      },
      'CallExpression': function (call) {
        if (context.getScope().type !== 'module') 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;

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