feat: support no-override-exports

.autod.conf.js

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+'use strict';
+
+module.exports = {
+  write: true,
+  prefix: '^',
+  test: [
+    'test',
+  ],
+  dep: [
+  ],
+  devdep: [
+    'egg-ci',
+    'egg-bin',
+    'autod',
+    'eslint',
+    'eslint-config-egg',
+    'webstorm-disable-index',
+  ],
+  exclude: [
+    './test/fixtures',
+  ],
+};

.eslintignore

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+coverage

.eslintrc

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+{
+  "extends": "eslint-config-egg"
+}

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for your pull request. Please review below requirements.
+Bug fixes and new features should include tests and possibly benchmarks.
+Contributors guide: https://github.com/eggjs/egg/blob/master/CONTRIBUTING.md
+
+感谢您贡献代码。请确认下列 checklist 的完成情况。
+Bug 修复和新功能必须包含测试，必要时请附上性能测试。
+Contributors guide: https://github.com/eggjs/egg/blob/master/CONTRIBUTING.md
+-->
+
+##### Checklist
+<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->
+
+- [ ] `npm test` passes
+- [ ] tests and/or benchmarks are included
+- [ ] documentation is changed or added
+- [ ] commit message follows commit guidelines
+
+##### Affected core subsystem(s)
+<!-- Provide affected core subsystem(s). -->
+
+
+##### Description of change
+<!-- Provide a description of the change below this comment. -->

.gitignore

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+logs/
+npm-debug.log
+node_modules/
+coverage/
+.idea/
+run/
+.DS_Store
+*.swp
+.vscode

README.md

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+# eslint-plugin-eggache
+
+custom eslint rule for egg RTFM questions
+
+[![NPM version][npm-image]][npm-url]
+[![build status][travis-image]][travis-url]
+[![Test coverage][codecov-image]][codecov-url]
+[![David deps][david-image]][david-url]
+[![Known Vulnerabilities][snyk-image]][snyk-url]
+[![NPM download][download-image]][download-url]
+
+[npm-image]: https://img.shields.io/npm/v/eslint-plugin-eggache.svg?style=flat-square
+[npm-url]: https://npmjs.org/package/eslint-plugin-eggache
+[travis-image]: https://img.shields.io/travis/{{org}}/eslint-plugin-eggache.svg?style=flat-square
+[travis-url]: https://travis-ci.org/{{org}}/eslint-plugin-eggache
+[codecov-image]: https://codecov.io/gh/{{org}}/eslint-plugin-eggache/branch/master/graph/badge.svg
+[codecov-url]: https://codecov.io/gh/{{org}}/eslint-plugin-eggache
+[david-image]: https://img.shields.io/david/{{org}}/eslint-plugin-eggache.svg?style=flat-square
+[david-url]: https://david-dm.org/{{org}}/eslint-plugin-eggache
+[snyk-image]: https://snyk.io/test/npm/eslint-plugin-eggache/badge.svg?style=flat-square
+[snyk-url]: https://snyk.io/test/npm/eslint-plugin-eggache
+[download-image]: https://img.shields.io/npm/dm/eslint-plugin-eggache.svg?style=flat-square
+[download-url]: https://npmjs.org/package/eslint-plugin-eggache
+
+## Usage
+
+```bash
+npm i eslint-plugin-eggache --save
+```
+
+## Rules
+
+### no-override-exports
+
+A common mistake that newbee will make - override `module.exports` and `exports`.
+
+```js
+/* eslint eggache/no-override-exports: [ 'error' ] */
+
+// config/config.default.js
+exports.view = {};
+
+module.exports = appInfo => {
+  const config = exports = {};
+  config.keys = '123456';
+  return config;
+}
+```
+
+**Options**:
+
+The first options is a boolean, default to false, means only check:
+- `config/config.*.js`
+- `config/plugin.*.js`
+
+set it to `true` means to check all files.
+
+```js
+/* eslint eggache/no-override-exports: [ 'error', true ] */
+
+// due to options `true`, this will pass the lint
+// ${app_root}/app.js
+module.exports = exports = {};
+exports.keys = '123456';
+```

index.js

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+'use strict';
+
+module.exports = {
+  rules: {
+    'no-override-exports': require('./lib/rules/no-override-exports'),
+  },
+};

lib/rules/no-override-exports.js

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+'use strict';
+
+const path = require('path');
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Disallow override exports',
+      category: 'Possible Errors',
+      recommended: true,
+      url: 'https://github.com/eggjs/eslint-plugin-eggache#no-override-exports',
+    },
+    schema: [
+      {
+        // if true, check all file, otherwise only check `config/config.*.js` or config/plugin.*.js`
+        type: 'boolean',
+      },
+    ],
+    messages: {
+      exportsAfterModule: 'Don\'t use `exports` after `module.exports`',
+      moduleAfterExports: 'Don\'t use `module.exports` after `exports`',
+      repeatModule: 'Don\'t use `module.exports` multiple times',
+    },
+  },
+  create(context) {
+    let hasExports = false;
+    let hasModule = false;
+    const shouldCheckAll = context.options[0];
+    // if `!shouldCheckAll`, then only check `<input>` or `config/config.*.js` or `config/plugin.*.js`
+    if (!shouldCheckAll && !isConfig(context)) return {};
+
+    return {
+      ExpressionStatement(node) {
+        // only consider the root scope
+        if (context.getScope().type !== 'global') return;
+        if (node.expression.type !== 'AssignmentExpression') return;
+        const testNode = node.expression.left;
+        if (isExports(testNode)) {
+          if (hasModule) {
+            context.report({ node, messageId: 'exportsAfterModule' });
+          }
+          hasExports = true;
+        } else if (isModule(testNode)) {
+          if (hasExports) {
+            context.report({ node, messageId: 'moduleAfterExports' });
+          }
+          if (hasModule) {
+            context.report({ node, messageId: 'repeatModule' });
+          }
+          hasModule = true;
+        }
+      },
+    };
+  },
+};
+
+function isConfig(context) {
+  const filePath = context.getFilename();
+  if (filePath === '<input>') return true;
+  const baseName = path.basename(filePath);
+  const dirname = path.basename(path.dirname(filePath));
+  return dirname === 'config' && (baseName.startsWith('config.') || baseName.startsWith('plugin.'));
+}
+
+function isExports(node) {
+  // exports.view = '';
+  // exports['view'] = '';
+  return node.object.type === 'Identifier' && node.object.name === 'exports';
+}
+
+function isModule(node) {
+  // module.exports = {};
+  // module.exports = () => {};
+  if (node.object.type === 'Identifier') {
+    return node.object.name === 'module' && node.property.type === 'Identifier' && node.property.name === 'exports';
+  }
+
+  if (node.object.type === 'MemberExpression') {
+    const realNode = node.object;
+    return realNode.object.name === 'module' && realNode.property.type === 'Identifier' && realNode.property.name === 'exports';
+  }
+}

package.json

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+{
+  "name": "eslint-plugin-eggache",
+  "version": "1.0.0",
+  "description": "custom eslint rule for egg RTFM questions",
+  "dependencies": {
+
+  },
+  "devDependencies": {
+    "autod": "^3.0.1",
+    "egg-bin": "^4.3.7",
+    "egg-ci": "^1.8.0",
+    "eslint": "^4.17.0",
+    "eslint-config-egg": "^6.0.0",
+    "is-type-of": "^1.2.0",
+    "webstorm-disable-index": "^1.2.0"
+  },
+  "engines": {
+    "node": ">=6.0.0"
+  },
+  "scripts": {
+    "autod": "autod",
+    "lint": "eslint .",
+    "test": "npm run lint -- --fix && egg-bin pkgfiles && npm run test-local",
+    "test-local": "egg-bin test",
+    "cov": "egg-bin cov",
+    "ci": "npm run lint && egg-bin pkgfiles --check && npm run cov",
+    "pkgfiles": "egg-bin pkgfiles"
+  },
+  "ci": {
+    "version": "6, 8"
+  },
+  "repository": {
+    "type": "git",
+    "url": ""
+  },
+  "files": [
+    "index.js",
+    "lib"
+  ],
+  "author": "TZ <atian25@qq.com>",
+  "license": "MIT"
+}

test/rules/no-override-exports.test.js

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+'use strict';
+
+const defineTest = require('../utils').defineTest;
+
+defineTest('no-override-exports', {
+  valid: [
+    `
+    module.exports = appInfo => {
+      const config = exports = {};
+      exports.view = '';
+      return config;
+    }
+    `,
+    `
+    exports.view = '';
+    exports['view'] = '';
+    `,
+    'module.exports = {};',
+    'module.exports = appInfo => {};',
+    {
+      code: `
+        module.exports = {};
+        exports.view = true;
+      `,
+      // don't check not config files
+      filename: '/app_root/app.js',
+      options: [ ],
+    },
+  ],
+
+  invalid: [
+    {
+      code: `
+        exports.view = '';
+        module.exports = {};
+      `,
+      errors: [{ messageId: 'moduleAfterExports' }],
+    },
+    {
+      code: `
+        module.exports = {};
+        exports.view = '';
+      `,
+      errors: [{ messageId: 'exportsAfterModule' }],
+    },
+    {
+      code: `
+        module.exports = {};
+        module.exports.view = '';
+      `,
+      errors: [{ messageId: 'repeatModule' }],
+    },
+    {
+      code: `
+        module.exports = {};
+        exports.view = true;
+      `,
+      // check all files
+      filename: '/app_root/app.js',
+      options: [ true ],
+      errors: [{ messageId: 'exportsAfterModule' }],
+    },
+  ],
+});

test/utils.js

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+'use strict';
+
+const is = require('is-type-of');
+const RuleTester = require('eslint').RuleTester;
+const ruleTester = new RuleTester();
+
+exports.defineTest = (ruleName, fixtures) => {
+  const rule = require(`../lib/rules/${ruleName}`);
+
+  fixtures.valid = (fixtures.valid || []).map(item => normalizeFixture(item));
+  fixtures.invalid = (fixtures.invalid || []).map(item => normalizeFixture(item));
+
+  return ruleTester.run(`test/rules/${ruleName}.test.js`, rule, fixtures);
+};
+
+function normalizeFixture(input) {
+  if (is.string(input)) {
+    input = {
+      code: input,
+    };
+  }
+  // input.
+  input.parserOptions = Object.assign({ ecmaVersion: 6 }, input.parserOptions);
+  return input;
+}