Duplicate JavaScript

Detects duplicate JavaScript libraries loaded multiple times

Rule ID	perf/duplicate-js
Category	Performance
Scope	Per-page
Severity	warning
Weight	5/10

Solution

Remove duplicate JavaScript library loads to reduce page weight and avoid conflicts. Check for the same library loaded from different CDNs or versions. Use a single source for each dependency. Consider using a module bundler to deduplicate shared dependencies.

Enable / Disable

Disable this rule

[rules]
disable = ["perf/duplicate-js"]

Disable all Performance rules

[rules]
disable = ["perf/*"]

Enable only this rule

[rules]
enable = ["perf/duplicate-js"]
disable = ["*"]