Size Limit
A performance budget tool for JavaScript that calculates the real cost of your JS and enforces limits on CI.
What is Size Limit?
Size Limit is a performance budget tool for JavaScript that calculates the real-world cost of your JavaScript bundles. It helps developers enforce size limits on their applications and libraries by integrating with CI systems to prevent performance regressions. The tool goes beyond simple byte counts to measure execution time and supports modern JavaScript features like ES modules and tree-shaking.
JavaScript developers and teams building web applications or libraries who need to maintain performance standards and prevent bundle bloat. It's particularly valuable for projects with strict performance requirements or those publishing to npm.
Developers choose Size Limit because it provides actionable, time-based performance metrics rather than just byte counts, integrates seamlessly into CI workflows to catch regressions early, and offers a modular plugin system that adapts to different project types from small libraries to large applications.
Overview
Calculate the real cost to run your JS app or lib to keep good performance. Show error in pull request if the cost exceeds the limit.
Use Cases
Best For
- Enforcing performance budgets in CI/CD pipelines
Related Projects
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