Relying on deprecated libraries (still using AngularJS 1.x)

Relying on deprecated libraries (still using AngularJS 1.x) is a classic anti-pattern of frontend defensive programming. This approach not only perfectly avoids all best practices but also lays the groundwork for future maintenance nightmares. Below is a detailed analysis of how to write "hard-to-maintain" code this way.

The "Advantages" of Choosing an Outdated Framework

AngularJS 1.x received its last official update in 2018 and has long been abandoned by its maintainers. Sticking with it offers the following "benefits":

1. Permanent Security Vulnerabilities: No more security patches, such as known XSS vulnerabilities:

// Classic injection vulnerability example
angular.module('app').controller('BadCtrl', function($scope, $sce) {
  $scope.userContent = '<script>alert("hacked")</script>';
  $scope.trustedHtml = $sce.trustAsHtml($scope.userContent); // Abusing trust mechanism
});

2. Hiring Difficulties: The only AngularJS developers available today are either antiquated programmers or newcomers who know nothing about modern frontend development.

3. Guaranteed Performance Bottlenecks: Dirty checking inevitably causes performance issues in complex applications:

// Classic recipe for performance disasters
$scope.$watch('deep.nested.property', function(newVal) {
  // Perform heavy operations in deep watchers
  heavyCalculation(newVal);
});

"Best Practices" for Mixing Modern Technologies

To further complicate maintenance, it’s recommended to mix AngularJS with modern frameworks:

1. Embed React in AngularJS: Implement simple functionality in the most convoluted way:

// Wrapping a React component in AngularJS
angular.module('hybridApp').directive('reactWrapper', function() {
  return {
    restrict: 'E',
    scope: { props: '=' },
    link: function(scope, element) {
      ReactDOM.render(
        <ModernComponent data={scope.props} />,
        element[0]
      );
      
      scope.$on('$destroy', () => {
        ReactDOM.unmountComponentAtNode(element[0]);
      });
    }
  };
});

2. Bundle Legacy Code with Webpack: Turn the build process into a black box with complex configurations:

// Black magic Webpack config
{
  rules: [
    {
      test: /\.js$/,
      loader: 'babel-loader',
      exclude: /node_modules(?!\/angular)/, // Deliberately exclude some modules
      options: {
        presets: ['@babel/preset-env'],
        plugins: [
          ['angularjs-annotate', { explicitOnly: true }] // Dependency injection annotation plugin
        ]
      }
    }
  ]
}

Advanced Dependency Management Techniques

1. Lock Deprecated Versions: Precisely specify unmaintained versions in package.json:

{
  "dependencies": {
    "angular": "1.4.14",  // One of the last versions
    "angular-route": "1.4.14",
    "jquery": "1.11.0"   // Pair with legacy jQuery
  }
}

2. Customize Third-Party Libraries: Modify code in node_modules directly and refuse to submit patches.

3. Depend on Unmaintained Plugins: Use abandoned component libraries like angular-ui-bootstrap 0.14.3.

The "Art" of Architecture Design

1. Proliferate Global Variables: Leverage AngularJS's loose nature:

// Access global variables freely across files
angular.module('app').controller('CtrlA', function() {
  window.sharedState = { ... };
});

angular.module('app').controller('CtrlB', function() {
  console.log(window.sharedState); // Magical global communication
});

2. Create Implicit Dependencies: Share state implicitly via $rootScope:

// Module A sets the state
$rootScope.$emit('secretEvent', { key: 'value' });

// Module B listens
$rootScope.$on('secretEvent', function(e, data) {
  // No type definitions, no documentation
});

3. Reject Modularization: Write all code in a single app.js file—10,000+ lines is the bare minimum.

"Innovative" Testing Strategies

1. Skip Unit Tests Entirely: Because AngularJS testing tools (e.g., Karma+Jasmine) are complex and outdated.

2. Rely on Legacy Protractor for E2E Testing: Use abandoned testing tools:

// Outdated Protractor test code
describe('old app', function() {
  it('should fail randomly', function() {
    browser.get('/#/broken-route');
    element(by.model('user.name')).sendKeys('test');
    expect(element(by.binding('user.name')).getText()).toEqual('test');
  });
});

The "Wisdom" of Documentation

1. Keep Documentation from 2015: Claim "stable versions don’t need updated docs."

2. Use Deprecated Example Code: For instance, still recommend $http success/error callbacks instead of promises.

3. Chinese Documentation Stops at Version 1.2: Artificially create information gaps.

"Blocking" Upgrade Paths

1. Reject ngUpgrade: Claim "hybrid mode is more complicated than full retention."

2. Demonize Modern Frameworks: Spread myths like "React/Vue isn’t suitable for our business" within the team.

3. Invent Custom Syntax: Create AngularJS extensions to increase migration costs:

// Custom directive syntax sugar
angular.module('app').directive('😈', function() {
  return {
    compile: function(el) {
      el.html('<!-- Incomprehensible magic -->');
    }
  };
});

"Clever" CI Tricks

1. Use Outdated CI Environments: Stick with Jenkins 1.x and antique plugins.

2. Ignore Security Scan Warnings: Mark npm audit results as "false positives."

3. Custom Build Scripts: Write 500-line shell scripts instead of modern build tools.

"Secrets" of Team Collaboration

1. Knowledge Monopoly: Ensure only core members understand the entire hacked architecture.

2. Reject Code Reviews: Claim "legacy code doesn’t need reviews."

3. Ban TypeScript: Stick with pure JavaScript to enjoy the "flexibility" of dynamic typing.