What Is a Runtime Chunk?
A runtime chunk is a small file that contains the bundler boilerplate responsible for loading and wiring together the other chunks at run time. It holds the module registry and the logic that resolves dynamic imports. Extracting it into its own file keeps that frequently changing bookkeeping out of the larger, more cacheable bundles.
Why it matters
Isolating the runtime means a content hash change in one chunk does not ripple into every other file. That keeps long-term caching effective across deploys.
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