Vendor Chunk - CI/CD Glossary Definition

A vendor chunk holds your third-party dependencies separately so they cache across deploys of your own code.

A vendor chunk is an output chunk containing third-party dependencies (typically from node_modules), separated from application code so it can be cached independently. It changes only when dependencies change.

Because libraries change less often than app code, splitting them into a vendor chunk lets browsers keep the cached copy while you ship frequent app updates. Bundlers create it via split-chunks configuration. In CI, bundle analysis shows vendor chunk size trends.

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