nx/dist/src/migrations/update-21-0-0/remove-legacy-cache.md

The core Nx plugin contains the core functionality of Nx like the project graph, nx commands and task orchestration.

#### Use Legacy Cache

Removes `useLegacyCache` from `nx.json` as it is no longer functional in Nx 21

#### Sample Code Changes

##### Before

```json title="nx.json"
{
  "targetDefaults": {},
  "useLegacyCache": true
}
```

##### After

```json title="nx.json"
{
  "targetDefaults": {}
}
```