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 and execution time limits on their code, preventing performance regressions by integrating checks into continuous integration pipelines. The tool provides actionable metrics, including download and execution time, to keep applications fast for end-users.
JavaScript developers and teams building web applications, libraries, or npm packages who need to maintain performance budgets and prevent bundle bloat. It's especially useful for projects with strict performance requirements or those published to npm.
Developers choose Size Limit because it offers accurate, time-based performance metrics beyond simple bundle size, integrates seamlessly into CI/CD workflows, and provides modular plugins to fit various project types—from large applications to small libraries.
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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