> For AI agents: the complete documentation index is available at https://rspack.rs/llms.txt, the full documentation bundle is available at https://rspack.rs/llms-full.txt.

# DeterministicChunkIdsPlugin

`DeterministicChunkIdsPlugin` assigns short numeric chunk ids that remain stable between builds, helping with long-term caching.

`optimization.chunkIds: 'deterministic'` uses this plugin internally. Add the plugin manually when you need to customize its options.

## Examples

```js title="rspack.config.mjs"
import rspack from '@rspack/core';

export default {
  optimization: {
    chunkIds: false,
  },
  plugins: [
    new rspack.ids.DeterministicChunkIdsPlugin({
      salt: 42,
    }),
  ],
};
```

## Options

### salt

- **Type:** `number`
- **Default:** `10`

The hash salt used when generating ids. Change this value to try a different hash starting value in the same id space.