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Get Started Free →Use when reviewing scripts, client components, bundles, or runtime behavior related to Minify all JavaScript files. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-01 | ✗→✓ | ▲ Improved | 10% | 0% |
| case-02 | ✗→✓ | ▲ Improved | -13% | 0% |
| case-04 | ✗→✓ | ▲ Improved | -54% | 0% |
| case-06 | ✓→✗ | ▼ Worse | 26% | 0% |
| case-08 | ✓→✓ | ＝ Same ✓ | -1% | 0% |
Unminified JavaScript adds hundreds of KB to page weight, slowing down load times especially on mobile networks where every byte counts.
Verify that all JavaScript files are minified in production to reduce file size, remove comments, and optimize code for faster loading and execution.
Configure your build system to minify JavaScript files using tools like Terser, UglifyJS, or built-in framework minification for production deployment.
Explain how JavaScript minification improves website performance by reducing bundle sizes, eliminating dead code, and optimizing parsing speed.
Review scripts, client components, and browser execution paths related to Minify all JavaScript files. Flag exact imports, event handlers, runtime side effects, or blocking operations that violate the rule, and state how the change should be verified in the browser.
For full implementation details, code examples, and framework-specific guidance, see references/rule.md.
Rule page: https://frontendchecklist.io/en/rules/javascript/javascript-minification
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