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## Cordis surface
Generated from source by `scripts/gen-cordis-catalog.ts` (verified fresh by `pnpm run verify-cordis-catalog` in doc-sync; regenerate with `pnpm run gen-cordis-catalog`) — this section is byte-identical in both language sides of the page. Signature blocks use a `ts cordis-catalog` fence and keep the original source JSDoc; dispatch modes are defined in the [primer](../cordis-primer.md#dispatch-modes), and the framework-inherited `ctx` surface lives in [cordis-api/inherited.md](../cordis-api/inherited.md).
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### `ctx.invariants` — `InvariantService`
Package-owned invariant registry with global and regex-based selection.
```ts cordis-catalog
/**
* Register one package's invariant installer. The package name is reserved
* even when filtering disables its checks. Enabled installers run in a child
* fiber; failure disposes that fiber and releases the reservation.
* @param packageName - full npm package name that owns the contribution.
* @param installer - listener or startup-check installer for the child context.
* @returns an effect-scoped disposer for the registration.