@testgorilla/tgo-linting

@testgorilla/tgo-linting

Linting rules and code quality standards for TestGorilla projects.

Installation

npm install @testgorilla/tgo-linting @angular-eslint/template-parser --save-dev

Compatibility

tgo-linting	ESLint	angular-eslint	Angular
5.1+	^10.0.0	21.x	any (angular-eslint 21 bundles its own compiler)
5.0	^9.0.0 || ^10.0.0	21.x	any (angular-eslint 21 bundles its own compiler)
4.x	^8.57.0 || ^9.0.0	20.x	any

ESLint 9 support ended in 5.1.0. 5.0.0 kept the ^9.0.0 || ^10.0.0 peer range so repos could adopt the preset before finishing their ESLint 10 migration. All consumers completed that migration alongside the Angular 21 upgrade, so 5.1.0 narrows the range to ESLint 10 only. Stay on 5.0.0 if you are still on ESLint 9 — and note that 5.0.0 also required an eslint-plugin-rxjs-x override to install cleanly on 9, which 5.1.0 no longer needs.

Upgrading to 5.1.0

5.1.0 restores the @eslint/js recommended baseline in the recommended() preset. Up to 5.0.0 the preset only spread the typescript-eslint configs, whose eslint-recommended slice disables the core rules TypeScript already covers but never enables the rest — so core rules such as no-prototype-builtins, no-duplicate-case, no-async-promise-executor, no-unsafe-optional-chaining and no-misleading-character-class were silently inactive in consumers. The same release cherry-picks @angular-eslint/template/no-any and template/no-duplicate-attributes onto the HTML block.

No config change is needed, but expect new violations on first run after the bump. Dry-run npx eslint . before merging the upgrade.

5.1.0 also drops ESLint 9: both the eslint peer range and the bundled @eslint/js dependency are now ^10.0.0. @eslint/js@10.0.1 itself declares an eslint: ^10.0.0 peer, so an ESLint 9 install would fail to resolve rather than degrade quietly.

Usage

This package requires ESLint flat config (eslint.config.js/.mjs) and ESLint 10. Support for legacy .eslintrc.* configs and ESLint 8 was removed in 5.0.0; ESLint 9 support ended in 5.1.0.

Flat Config

Recommended approach:

// eslint.config.js
import tgoPlugin from '@testgorilla/tgo-linting';

export default [
  tgoPlugin.configs.recommended,
  // Your other configurations
];

Manual configuration:

// eslint.config.js
import tgoPlugin from '@testgorilla/tgo-linting';

export default [
  {
    plugins: {
      tgo: tgoPlugin,
    },
    rules: {
      'tgo/require-data-testid': 'warn', // Example rule configuration
    },
  },
];

Important Notes

• Template Parser Required: The tgo/require-data-testid rule only works with HTML/Angular templates. You must configure @angular-eslint/template-parser for .html files.
• Angular Projects: If you're using @angular-eslint, the template parser is usually already configured for HTML files in your overrides.

Rules

Available Rules

Rule	Description
tgo/require-data-testid	Ensures specific HTML elements have a data-testid attribute for E2E testing

Rule Documentation

Detailed documentation for each rule, including examples and configuration options, can be found alongside the rule implementation:

• require-data-testid - Enforces data-testid attributes on specified elements

Adding New Rules

To add a new ESLint rule to this package:

• Create the rule file in src/rules/:

  // src/rules/your-rule-name.ts
  import { Rule } from 'eslint';
  
  const rule: Rule.RuleModule = {
    meta: {
      type: 'problem', // or 'suggestion' or 'layout'
      docs: {
        description: 'Your rule description',
        category: 'Best Practices',
        recommended: false,
      },
      schema: [], // JSON schema for rule options
      messages: {
        // Define error messages here
      },
    },
    create(context) {
      // Your rule implementation
      return {
        // AST node visitors
      };
    },
  };
  
  export default rule;
  

• Add tests in src/rules/your-rule-name.spec.ts:

  import { RuleTester } from '@typescript-eslint/rule-tester';
  import rule from './your-rule-name';
  
  const ruleTester = new RuleTester({
    parser: '@angular-eslint/template-parser',
  });
  
  ruleTester.run('your-rule-name', rule, {
    valid: [
      // Test cases that should pass
    ],
    invalid: [
      // Test cases that should fail
    ],
  });
  

• Export the rule in src/rules/index.ts:

  import yourRuleName from './your-rule-name';
  
  export const rules = {
    'require-data-testid': requireDataTestId,
    'your-rule-name': yourRuleName,
  };
  

• Add to recommended config (optional) in src/configs/recommended.ts:

  rules: {
    'tgo/require-data-testid': 'warn',
    'tgo/your-rule-name': 'error', // or 'warn'
  }
  

• Document the rule in src/rules/your-rule-name.md:

  • Describe what the rule does
  • Provide configuration options
  • Show correct and incorrect code examples
  • Explain the rationale

• Update this README by adding the new rule to the rules table above

• Test your changes:

  nx test tgo-linting
  nx build tgo-linting
  

Development

Building

nx build tgo-linting

Testing

nx test tgo-linting

Linting

nx lint tgo-linting

License

PROPRIETARY - © TestGorilla