Terser VS User CSS

• Highly Effective Minification
  Terser provides comprehensive minification capabilities, significantly reducing JavaScript file sizes, which can lead to faster load times and improved application performance.
• ES6+ Support
  Terser supports modern JavaScript syntax, making it suitable for projects using ES6 features and beyond, ensuring compatibility with the latest JavaScript standards.
• Source Maps
  Terser can generate source maps, allowing developers to map minified code back to the original source code, which is crucial for debugging and maintaining large codebases.
• Plugin Friendly
  Terser integrates well with various build tools like Webpack, Rollup, and others, offering seamless integration into existing development workflows.
• Configurable
  Terser offers a high degree of configurability, enabling developers to tailor the minification process according to their specific needs and restrictions.

Possible disadvantages

• Complex Configuration
  The array of options and configurations available in Terser can be overwhelming for new users or those unfamiliar with JavaScript minification processes.
• Potential Bugs
  As with any complex minification tool, there's a risk of bugs or issues being introduced, especially if certain advanced or experimental features are used.
• Performance Overhead
  Minification, in general, requires additional processing time during build steps, which can increase CI/CD pipeline durations, particularly for large projects.
• Readability Loss
  Minified code is difficult to read and debug without source maps, so reliance on Terser makes generating source maps a necessity, which might not always be desired or feasible.
• Dependency Maintenance
  Keeping Terser and its related dependencies updated can be a maintenance burden, especially if breaking changes occur between versions.

• Customization
  User CSS allows for extensive customization of the appearance of websites, enabling users to tailor styles to their preferences or needs.
• Accessibility
  Custom styles can improve accessibility by enhancing contrast, increasing font sizes, or adjusting layouts to make content more readable for individuals with visual impairments.
• Consistency
  It can create a consistent look and feel across different websites by applying a personalized style sheet, which is beneficial for users who value uniformity.
• Ad Blocking
  User CSS can be used to hide unwanted elements like advertisements or pop-ups, creating a cleaner browsing experience.
• Focus on Content
  Users can modify the display to focus on content they deem important by hiding or de-emphasizing less relevant elements.

Possible disadvantages

• Maintenance
  User CSS scripts need regular updates and maintenance, as changes to website structures, class names, or IDs can break the applied styles.
• Compatibility Issues
  Custom styles may not render correctly across different devices or browsers, leading to inconsistencies in how content is viewed.
• Complexity
  For non-technical users, creating and managing User CSS can be complex and daunting without knowledge of CSS.
• Website Functionality
  Incorrect or overly aggressive styling can inadvertently break website functionality or usability by hiding functional elements such as navigation or interactive components.
• Performance
  Applying User CSS can affect the loading performance of websites, especially if the styles are extensive or poorly optimized.

• Everything about ESM and treeshaking

  I did try rollup with terser but I saw similar results. - Source: dev.to / over 1 year ago

• 10 Bad Habits That Can Slow Down Your JavaScript Applications 🐌

  Example: You've got a main.js file that's as long as a Tolstoy novel. Fix: Use tools like UglifyJS or Terser to minify your code. They'll squeeze out all the unnecessary bits and give you a sleeker, faster-loading file. - Source: dev.to / about 3 years ago

• Things you forgot because of React

  They can do it, it is just turned off by default and require more advanced configuration. - Source: Hacker News / about 3 years ago

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Tracking User CSS since Apr 2022.